Repository: leandrofroes/gftrace
Branch: master
Commit: 2cda67b565e0
Files: 19
Total size: 101.2 KB
Directory structure:
gitextract_ge7tbwtn/
├── .gitattributes
├── .gitignore
├── LICENSE
├── README.md
├── injector/
│ ├── injector.c
│ ├── injector.vcxproj
│ └── injector.vcxproj.filters
└── tracer/
├── dllmain.c
├── gftrace.cfg
├── hooks.c
├── hooks.h
├── pe.c
├── pe.h
├── stub.asm
├── stub32.asm
├── tracer.vcxproj
├── tracer.vcxproj.filters
├── utils.c
└── utils.h
================================================
FILE CONTENTS
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FILE: .gitattributes
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###############################################################################
# Set default behavior to automatically normalize line endings.
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# This is need for earlier builds of msysgit that does not have it on by
# default for csharp files.
# Note: This is only used by command line
###############################################################################
#*.cs diff=csharp
###############################################################################
# Set the merge driver for project and solution files
#
# Merging from the command prompt will add diff markers to the files if there
# are conflicts (Merging from VS is not affected by the settings below, in VS
# the diff markers are never inserted). Diff markers may cause the following
# file extensions to fail to load in VS. An alternative would be to treat
# these files as binary and thus will always conflict and require user
# intervention with every merge. To do so, just uncomment the entries below
###############################################################################
#*.sln merge=binary
#*.csproj merge=binary
#*.vbproj merge=binary
#*.vcxproj merge=binary
#*.vcproj merge=binary
#*.dbproj merge=binary
#*.fsproj merge=binary
#*.lsproj merge=binary
#*.wixproj merge=binary
#*.modelproj merge=binary
#*.sqlproj merge=binary
#*.wwaproj merge=binary
###############################################################################
# behavior for image files
#
# image files are treated as binary by default.
###############################################################################
#*.jpg binary
#*.png binary
#*.gif binary
###############################################################################
# diff behavior for common document formats
#
# Convert binary document formats to text before diffing them. This feature
# is only available from the command line. Turn it on by uncommenting the
# entries below.
###############################################################################
#*.doc diff=astextplain
#*.DOC diff=astextplain
#*.docx diff=astextplain
#*.DOCX diff=astextplain
#*.dot diff=astextplain
#*.DOT diff=astextplain
#*.pdf diff=astextplain
#*.PDF diff=astextplain
#*.rtf diff=astextplain
#*.RTF diff=astextplain
================================================
FILE: .gitignore
================================================
# Visual Studio Files
.vs/
*.opensdf
*.sdf
*.suo
*.sln
*.user
x64/
Release
Debug
================================================
FILE: LICENSE
================================================
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EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
================================================
FILE: README.md
================================================
# gftrace
A command line Windows API tracing tool for Golang binaries.
**Note:** This tool is a PoC and a work-in-progress prototype so please treat it as such. Feedbacks are always welcome!
## **How it works?**
Although Golang programs contains a lot of nuances regarding the way they are built and their behavior in runtime they still need to interact with the OS layer and that means at some point they do need to call functions from the Windows API.
The Go runtime package contains a function called [asmstdcall](https://github.com/golang/go/blob/master/src/runtime/sys_windows_amd64.s#L20) and this function is a kind of "gateway" used to interact with the Windows API. Since it's expected this function to call the Windows API functions we can assume it needs to have access to information such as the address of the function and it's parameters, and this is where things start to get more interesting.
Asmstdcall receives a single parameter which is pointer to something similar to the following structure:
```
struct LIBCALL {
DWORD_PTR Addr;
DWORD Argc;
DWORD_PTR Argv;
DWORD_PTR ReturnValue;
[...]
}
```
Some of these fields are filled after the API function is called, like the return value, others are received by asmstdcall, like the function address, the number of arguments and the list of arguments. Regardless when those are set it's clear that the asmstdcall function manipulates a lot of interesting information regarding the execution of programs compiled in Golang.
The gftrace leverages asmstdcall and the way it works to monitor specific fields of the mentioned struct and log it to the user. The tool is capable of log the function name, it's parameters and also the return value of each Windows function called by a Golang application. All of it with no need to hook a single API function or have a signature for it.
The tool also tries to ignore all the noise from the Go runtime initialization and only log functions called after it (i.e. functions from the main package).
If you want to know more about this project and research check the [blogpost](https://leandrofroes.github.io/posts/An-in-depth-look-at-Golang-Windows-calls/).
## **Installation**
Download the latest [release](https://github.com/leandrofroes/gftrace/releases).
## **Usage**
1. Make sure gftrace.exe, gftrace.dll and gftrace.cfg are in the same directory.
2. Specify which API functions you want to trace in the gftrace.cfg file (the tool does not work without API filters applied).
3. Run gftrace.exe passing the target Golang program path as a parameter.
```
gftrace.exe <filepath> <params>
```
## **Configuration**
All you need to do is specify which functions you want to trace in the gftrace.cfg file, separating it by comma with no spaces:
```
CreateFileW,ReadFile,CreateProcessW
```
The exact Windows API functions a Golang method X of a package Y would call in a specific scenario can only be determined either by analysis of the method itself or trying to guess it. There's some interesting characteristics that can be used to determine it, for example, Golang applications seems to always prefer to call functions from the "Wide" and "Ex" set (e.g. CreateFileW, CreateProcessW, GetComputerNameExW, etc) so you can consider it during your analysis.
The default config file contains multiple functions in which I tested already (at least most part of them) and can say for sure they can be called by a Golang application at some point. I'll try to update it eventually.
## **Examples**
Tracing CreateFileW() and ReadFile() in a simple Golang file that calls "os.ReadFile" twice:
```
- CreateFileW("C:\Users\user\Desktop\doc.txt", 0x80000000, 0x3, 0x0, 0x3, 0x1, 0x0) = 0x168 (360)
- ReadFile(0x168, 0xc000108000, 0x200, 0xc000075d64, 0x0) = 0x1 (1)
- CreateFileW("C:\Users\user\Desktop\doc2.txt", 0x80000000, 0x3, 0x0, 0x3, 0x1, 0x0) = 0x168 (360)
- ReadFile(0x168, 0xc000108200, 0x200, 0xc000075d64, 0x0) = 0x1 (1)
```
Tracing CreateProcessW() in the TunnelFish malware:
```
- CreateProcessW("C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe", "powershell /c "Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn; Get-Recipient | Select Name -ExpandProperty EmailAddresses -first 1 | Select SmtpAddress | ft -hidetableheaders"", 0x0, 0x0, 0x1, 0x80400, "=C:=C:\Users\user\Desktop", 0x0, 0xc0000ace98, 0xc0000acd68) = 0x1 (1)
- CreateProcessW("C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe", "powershell /c "Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn; Get-Recipient | Select Name -ExpandProperty EmailAddresses -first 1 | Select SmtpAddress | ft -hidetableheaders"", 0x0, 0x0, 0x1, 0x80400, "=C:=C:\Users\user\Desktop", 0x0, 0xc0000c4ec8, 0xc0000c4d98) = 0x1 (1)
- CreateProcessW("C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe", "powershell /c "Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn; Get-Recipient | Select Name -ExpandProperty EmailAddresses -first 1 | Select SmtpAddress | ft -hidetableheaders"", 0x0, 0x0, 0x1, 0x80400, "=C:=C:\Users\user\Desktop", 0x0, 0xc00005eec8, 0xc00005ed98) = 0x1 (1)
- CreateProcessW("C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe", "powershell /c "Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn; Get-Recipient | Select Name -ExpandProperty EmailAddresses -first 1 | Select SmtpAddress | ft -hidetableheaders"", 0x0, 0x0, 0x1, 0x80400, "=C:=C:\Users\user\Desktop", 0x0, 0xc0000bce98, 0xc0000bcd68) = 0x1 (1)
- CreateProcessW("C:\WINDOWS\system32\cmd.exe", "cmd /c "wmic computersystem get domain"", 0x0, 0x0, 0x1, 0x80400, "=C:=C:\Users\user\Desktop", 0x0, 0xc0000c4ef0, 0xc0000c4dc0) = 0x1 (1)
- CreateProcessW("C:\WINDOWS\system32\cmd.exe", "cmd /c "wmic computersystem get domain"", 0x0, 0x0, 0x1, 0x80400, "=C:=C:\Users\user\Desktop", 0x0, 0xc0000acec0, 0xc0000acd90) = 0x1 (1)
- CreateProcessW("C:\WINDOWS\system32\cmd.exe", "cmd /c "wmic computersystem get domain"", 0x0, 0x0, 0x1, 0x80400, "=C:=C:\Users\user\Desktop", 0x0, 0xc0000bcec0, 0xc0000bcd90) = 0x1 (1)
[...]
```
Tracing multiple functions in the Sunshuttle malware:
```
- CreateFileW("config.dat.tmp", 0x80000000, 0x3, 0x0, 0x3, 0x1, 0x0) = 0xffffffffffffffff (-1)
- CreateFileW("config.dat.tmp", 0xc0000000, 0x3, 0x0, 0x2, 0x80, 0x0) = 0x198 (408)
- CreateFileW("config.dat.tmp", 0xc0000000, 0x3, 0x0, 0x3, 0x80, 0x0) = 0x1a4 (420)
- WriteFile(0x1a4, 0xc000112780, 0xeb, 0xc0000c79d4, 0x0) = 0x1 (1)
- GetAddrInfoW("reyweb.com", 0x0, 0xc000031f18, 0xc000031e88) = 0x0 (0)
- WSASocketW(0x2, 0x1, 0x0, 0x0, 0x0, 0x81) = 0x1f0 (496)
- WSASend(0x1f0, 0xc00004f038, 0x1, 0xc00004f020, 0x0, 0xc00004eff0, 0x0) = 0x0 (0)
- WSARecv(0x1f0, 0xc00004ef60, 0x1, 0xc00004ef48, 0xc00004efd0, 0xc00004ef18, 0x0) = 0xffffffff (-1)
- GetAddrInfoW("reyweb.com", 0x0, 0xc000031f18, 0xc000031e88) = 0x0 (0)
- WSASocketW(0x2, 0x1, 0x0, 0x0, 0x0, 0x81) = 0x200 (512)
- WSASend(0x200, 0xc00004f2b8, 0x1, 0xc00004f2a0, 0x0, 0xc00004f270, 0x0) = 0x0 (0)
- WSARecv(0x200, 0xc00004f1e0, 0x1, 0xc00004f1c8, 0xc00004f250, 0xc00004f198, 0x0) = 0xffffffff (-1)
[...]
```
Tracing multiple functions in the DeimosC2 framework agent:
```
- WSASocketW(0x2, 0x1, 0x0, 0x0, 0x0, 0x81) = 0x130 (304)
- setsockopt(0x130, 0xffff, 0x20, 0xc0000b7838, 0x4) = 0xffffffff (-1)
- socket(0x2, 0x1, 0x6) = 0x138 (312)
- WSAIoctl(0x138, 0xc8000006, 0xaf0870, 0x10, 0xb38730, 0x8, 0xc0000b746c, 0x0, 0x0) = 0x0 (0)
- GetModuleFileNameW(0x0, "C:\Users\user\Desktop\samples\deimos.exe", 0x400) = 0x2f (47)
- GetUserProfileDirectoryW(0x140, "C:\Users\user", 0xc0000b7a08) = 0x1 (1)
- LookupAccountSidw(0x0, 0xc00000e250, "user", 0xc0000b796c, "DESKTOP-TEST", 0xc0000b7970, 0xc0000b79f0) = 0x1 (1)
- NetUserGetInfo("DESKTOP-TEST", "user", 0xa, 0xc0000b7930) = 0x0 (0)
- GetComputerNameExW(0x5, "DESKTOP-TEST", 0xc0000b7b78) = 0x1 (1)
- GetAdaptersAddresses(0x0, 0x10, 0x0, 0xc000120000, 0xc0000b79d0) = 0x0 (0)
- CreateToolhelp32Snapshot(0x2, 0x0) = 0x1b8 (440)
- GetCurrentProcessId() = 0x2584 (9604)
- GetCurrentDirectoryW(0x12c, "C:\Users\user\AppData\Local\Programs\retoolkit\bin") = 0x39 (57)
[...]
```
## **Future features:**
- [x] Support inspection of 32 bits files.
- [x] Add support to files calling functions via the "IAT jmp table" instead of the API call directly in asmstdcall.
- [x] Add support to cmdline parameters for the target process
- [ ] Send the tracing log output to a file by default to make it better to filter. Currently there's no separation between the target file and gftrace output. An alternative is redirect gftrace output to a file using the command line.
## :warning: **Warning**
* The tool inspects the target binary dynamically and it means the file being traced is executed. If you're inspecting a malware or an unknown software please make sure you do it in a controlled environment.
* Golang programs can be very noisy depending the file and/or function being traced (e.g. VirtualAlloc is always called multiple times by the runtime package, CreateFileW is called multiple times before a call to CreateProcessW, etc). The tool ignores the Golang runtime initialization noise but after that it's up to the user to decide what functions are better to filter in each scenario.
## **License**
The gftrace is published under the GPL v3 License. Please refer to the file named LICENSE for more information.
================================================
FILE: injector/injector.c
================================================
#include <stdio.h>
#include <windows.h>
int main(int argc, char** argv)
{
if (argc < 2)
{
printf("Usage: gftrace.exe <file> <params>\n");
return 1;
}
LPSTR CmdLine = GetCommandLineA();
LPSTR ProcCmdLine = strchr(CmdLine, 0x20);
//
// Ignore all the spaces next to argv[0]
//
while (*++ProcCmdLine == 0x20);
PROCESS_INFORMATION ProcessInformation;
STARTUPINFOA StartupInfo;
StartupInfo.cb = sizeof(STARTUPINFO);
ZeroMemory(&StartupInfo, sizeof(STARTUPINFO));
ZeroMemory(&ProcessInformation, sizeof(PROCESS_INFORMATION));
//
// Create the target process in suspended state.
//
if (!CreateProcessA(NULL, ProcCmdLine, NULL, NULL, FALSE, CREATE_SUSPENDED, NULL, NULL, &StartupInfo, &ProcessInformation))
{
printf("[!] Failed to create the target process.\n[!] Error code: %u\n", GetLastError());
return 1;
}
HANDLE hProcess = ProcessInformation.hProcess;
HANDLE hThread = ProcessInformation.hThread;
//
// Check if the target process is a Wow64 process and if so, terminate it cause we don't support it for now.
//
#ifdef _WIN64
BOOL IsWow64Proc = FALSE;
if (!IsWow64Process(hProcess, &IsWow64Proc))
{
printf("[!] Failed to check if the target process is WoW64.\n[!] Error code: %u\n", GetLastError());
TerminateProcess(hProcess, 0);
return 1;
}
if (IsWow64Proc)
{
printf("[!] The target file needs to be a x64 file.\n");
TerminateProcess(hProcess, 0);
return 1;
}
#endif
char LibFullPath[MAX_PATH] = {0};
char CurrentModuleFilepath[MAX_PATH] = {0};
DWORD Len = GetModuleFileNameA(GetModuleHandleA(NULL), CurrentModuleFilepath, MAX_PATH);
if (!Len)
{
printf("[!] Failed to get the current module filepath.\n[!] Error code: %u\n", GetLastError());
TerminateProcess(hProcess, 0);
return 1;
}
for (SIZE_T i = Len - 1; i > 0; i--)
{
if (CurrentModuleFilepath[i] == 0x5c || CurrentModuleFilepath[i] == 0x2f)
{
CurrentModuleFilepath[i + 1] = '\0';
break;
}
}
SIZE_T i = 0;
do
{
LibFullPath[i] = CurrentModuleFilepath[i];
i++;
} while (CurrentModuleFilepath[i] != '\0');
#ifdef _WIN64
const char* LibName = "\\gftrace.dll";
#else
const char* LibName = "\\gftrace32.dll";
#endif
SIZE_T Size = strlen(LibFullPath) + strlen(LibName) + 1;
//
// Build the gftrace.dll full path to be used in the injection step.
//
strncat_s(LibFullPath, Size, LibName, _TRUNCATE);
//
// Check if the gftrace.dll file exists in the gftrace.exe directory.
//
if (GetFileAttributesA((LPCSTR)LibFullPath) == INVALID_FILE_ATTRIBUTES && GetLastError() == ERROR_FILE_NOT_FOUND)
{
printf("[!] Failed to find the gftrace DLL file in the gftrace.exe directory.\n");
TerminateProcess(hProcess, 0);
return 1;
}
//
// Get kernel32.dll module base address.
//
HMODULE ModuleBase = GetModuleHandleW(L"kernel32.dll");
if (ModuleBase == NULL)
{
printf("[!] Failed to get kernel32 base address.\n[!] Error code: %u\n", GetLastError());
TerminateProcess(hProcess, 0);
return 1;
}
//
// Get the address of LoadLibraryA() to be used to inject gftrace DLL into the target process.
//
FARPROC pLoadLibraryA = GetProcAddress(ModuleBase, "LoadLibraryA");
if (pLoadLibraryA == NULL)
{
printf("[!] Failed to resolve LoadLibraryA address.\n[!] Error code: %u\n", GetLastError());
TerminateProcess(hProcess, 0);
return 1;
}
//
// Allocate memory for gftrace DLL full path in the target process.
//
LPVOID LibFullPathRemoteAddr = VirtualAllocEx(hProcess, NULL, Size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (LibFullPathRemoteAddr == NULL)
{
printf("[!] Failed to allocate virtual memory in the target process.\n[!] Error code: %u\n", GetLastError());
TerminateProcess(hProcess, 0);
return 1;
}
//
// Write gftrace DLL full path into the target process.
//
if (!WriteProcessMemory(hProcess, LibFullPathRemoteAddr, (LPCVOID)LibFullPath, Size, NULL))
{
printf("[!] Failed to write to the target process memory.\n[!] Error code: %u\n", GetLastError());
TerminateProcess(hProcess, 0);
return 1;
}
DWORD ThreadId;
//
// Create a thread in the target process pointing to LoadLibraryA() to load the gftrace DLL into the target process address space.
//
HANDLE hInjectionThread = CreateRemoteThread(hProcess, NULL, 0, (LPTHREAD_START_ROUTINE)pLoadLibraryA, (LPVOID)LibFullPathRemoteAddr, 0, &ThreadId);
if (hInjectionThread == NULL)
{
printf("[!] Failed to create a remote thread in the target process.\n[!] Error code: %u\n", GetLastError());
TerminateProcess(hProcess, 0);
return 1;
}
//
// Wait for the injection thread to finish.
//
WaitForSingleObject(hInjectionThread, INFINITE);
//
// Resume the target process main thread.
//
ResumeThread(hThread);
WaitForSingleObject(hProcess, INFINITE);
VirtualFreeEx(hProcess, LibFullPathRemoteAddr, 0, MEM_RELEASE);
CloseHandle(hInjectionThread);
CloseHandle(hThread);
return 0;
}
================================================
FILE: injector/injector.vcxproj
================================================
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup Label="ProjectConfigurations">
<ProjectConfiguration Include="Debug|Win32">
<Configuration>Debug</Configuration>
<Platform>Win32</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Release|Win32">
<Configuration>Release</Configuration>
<Platform>Win32</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Debug|x64">
<Configuration>Debug</Configuration>
<Platform>x64</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Release|x64">
<Configuration>Release</Configuration>
<Platform>x64</Platform>
</ProjectConfiguration>
</ItemGroup>
<PropertyGroup Label="Globals">
<VCProjectVersion>16.0</VCProjectVersion>
<Keyword>Win32Proj</Keyword>
<ProjectGuid>{adacdd4b-f686-4706-bc39-ec3896af2d86}</ProjectGuid>
<RootNamespace>injector</RootNamespace>
<WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<PlatformToolset>v143</PlatformToolset>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<PlatformToolset>v143</PlatformToolset>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<PlatformToolset>v143</PlatformToolset>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<PlatformToolset>v143</PlatformToolset>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
<ImportGroup Label="ExtensionSettings">
</ImportGroup>
<ImportGroup Label="Shared">
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<PropertyGroup Label="UserMacros" />
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<LinkIncremental>true</LinkIncremental>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<LinkIncremental>false</LinkIncremental>
<TargetName>gftrace32</TargetName>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<LinkIncremental>true</LinkIncremental>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<LinkIncremental>false</LinkIncremental>
<TargetName>gftrace</TargetName>
</PropertyGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
<GenerateDebugInformation>true</GenerateDebugInformation>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
<Optimization>Disabled</Optimization>
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
<EnableCOMDATFolding>true</EnableCOMDATFolding>
<OptimizeReferences>true</OptimizeReferences>
<GenerateDebugInformation>false</GenerateDebugInformation>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
<GenerateDebugInformation>true</GenerateDebugInformation>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
<Optimization>Disabled</Optimization>
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
<EnableCOMDATFolding>true</EnableCOMDATFolding>
<OptimizeReferences>true</OptimizeReferences>
<GenerateDebugInformation>false</GenerateDebugInformation>
</Link>
</ItemDefinitionGroup>
<ItemGroup>
<ClCompile Include="injector.c" />
</ItemGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets">
</ImportGroup>
</Project>
================================================
FILE: injector/injector.vcxproj.filters
================================================
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup>
<Filter Include="Source Files">
<UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
<Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
</Filter>
<Filter Include="Header Files">
<UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
<Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
</Filter>
<Filter Include="Resource Files">
<UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
<Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
</Filter>
</ItemGroup>
<ItemGroup>
<ClCompile Include="injector.c">
<Filter>Source Files</Filter>
</ClCompile>
</ItemGroup>
</Project>
================================================
FILE: tracer/dllmain.c
================================================
#include "utils.h"
#include "hooks.h"
VOID
Init()
{
//
// Get kernel32.dll module base address.
//
HMODULE ModuleBase = GetModuleHandleW(L"kernel32.dll");
if (ModuleBase == NULL)
{
PrintWinError("Failed to get kernel32.dll base address", GetLastError());
}
//
// Get the address of GetCommandLineW() and save it for further usage.
//
pGetCommandLineW = GetProcAddress(ModuleBase, (LPCSTR)"GetCommandLineW");
if (pGetCommandLineW == NULL)
{
PrintWinError("Failed to resolve GetCommandLineW() address", GetLastError());
}
//
// Get the address of GetProcAddress() and save it for further usage.
//
pGetProcAddress = GetProcAddress(ModuleBase, (LPCSTR)"GetProcAddress");
if (pGetProcAddress == NULL)
{
PrintWinError("Failed to resolve GetProcAddress() address", GetLastError());
}
//
// Initialize a critical section object.
//
InitializeCriticalSection(&CriticalSection);
//
// Parse the user-defined API function list and initialize our global target list.
//
InitTargetFuncList();
//
// Initialize our IAT deny list.
//
InitIATDenyList();
//
// Perform the asmstdcall hook.
//
HookAsmstdcall();
}
BOOL WINAPI DllMain(
HINSTANCE hModule,
DWORD Reason,
LPVOID Reserved
)
{
switch (Reason)
{
case DLL_PROCESS_ATTACH:
//
// Disable the DLL_THREAD_ATTACH and DLL_THREAD_DETACH notifications in our DLL.
//
DisableThreadLibraryCalls(hModule);
Init();
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
while (!GetAsyncKeyState(VK_RETURN))
{
Sleep(1000);
}
printf("\n\n[+] Trace finished! Press \"Enter\" to close...\n");
break;
}
return TRUE;
}
================================================
FILE: tracer/gftrace.cfg
================================================
CreateFileW,ReadFile,WriteFile,MoveFileW,DeleteFileW,SetFilePointerEx,CopyFileW,FindFirstFileW,SetFileAttributesW,GetCurrentDirectoryW,GetUserProfileDirectoryW,SetCurrentDirectoryW,GetTempPathW,GetModuleFileNameW,RemoveDirectoryW,GetSystemDirectoryW,GetFullPathNameW,WSASocketW,socket,setsockopt,gethostbyname,WSARecvFrom,WSASendTo,DnsQuery_W,WSAIoctl,WSASend,WSASendTo,WSARecv,GetAddrInfoW,WinHttpAddRequestHeaders,WinHttpOpen,WinHttpConnect,WinHttpOpenRequest,WinHttpSendRequest,WinHttpReceiveResponse,WinHttpReadData,WinHttpSetOption,WinHttpSetTimeouts,WinHttpGetIEProxyConfigForCurrentUser,WinHttpGetProxyForUrl,WinHttpGetDefaultProxyConfiguration,OpenProcess,CreateProcessW,CreateProcessAsUserW,TerminateProcess,GetCurrentProcessId,ReadProcessMemory,WriteProcessMemory,ConvertSidToStringSidW,CreateMutexW,CreateToolhelp32Snapshot,QueryFullProcessImageNameW,OpenProcessToken,GetTokenInformation,CheckTokenMembership,AdjustTokenPrivileges,LookupAccountSidW,CreateNamedPipeW,ShellExecuteW,WTSGetActiveConsoleSessionId,WTSQuerySessionInformationW,GetLogicalDrives,GetDriveTypeW,GetLogicalDriveStringsW,GetVolumeInformationW,RegCreateKeyExW,RegOpenKeyExW,RegQueryValueExW,RegSetValueExW,RegDeleteKeyW,GetComputerNameExW,LookupAccountNameW,NetUserGetInfo,GetAdaptersAddresses,GetTimeZoneInformation,GetMonitorInfoW,EnumDisplaySettingsW,GetSystemMetrics,GetDC,CreateCompatibleDC,CreateCompatibleBitmap,BitBlt,GetDIBits,SelectObject,GetSystemTimes,RegisterServiceCtrlHandlerExW
================================================
FILE: tracer/hooks.c
================================================
#include "hooks.h"
#include "utils.h"
#include "pe.h"
bIsReadyToLog = FALSE;
LPVOID
PerformHook(
_In_ ULONG_PTR Src,
_In_ ULONG_PTR Dest,
_In_ SIZE_T Len
)
{
CHAR HookBytes[] = {
0x49, 0xbb, 0xd, 0xe, 0xa, 0xd, 0xb, 0xe, 0xe, 0xf, // mov r11, <target_addr>
0x41, 0xff, 0xe3, // jmp r11
};
DWORD HookBytesLen = 13;
DWORD OldProtection;
//
// Change the memory permission of the region we want to modify the bytes.
//
if (!VirtualProtect((LPVOID)Src, Len, PAGE_EXECUTE_READWRITE, &OldProtection))
{
PrintWinError("Failed setting the hook memory region protection", GetLastError());
}
//
// Write the HookBytes array with the correct dest address into the target address.
//
*(ULONG_PTR*)(HookBytes + 2) = Dest;
RtlCopyMemory((LPVOID)Src, (LPCVOID)HookBytes, sizeof(HookBytes));
//
// NOP the remaining hook bytes to make sure the instructions will be properly aligned.
//
for (SIZE_T i = HookBytesLen; i < Len; i++)
{
*((BYTE*)Src + i) = 0x90;
}
//
// Restore the hook memory region permissions.
//
if (!VirtualProtect((LPVOID)Src, Len, OldProtection, &OldProtection))
{
PrintWinError("Failed setting the old memory protection", GetLastError());
}
//
// Return the jump back address (i.e. the address to return after our hook is executed).
//
return (LPVOID)(Src + Len);
}
LPVOID
PerformHook32(
_In_ ULONG_PTR Src,
_In_ ULONG_PTR Dest,
_In_ SIZE_T Len
)
{
DWORD HookBytesLen = 5;
DWORD OldProtection;
//
// Change the memory permission of the region we want to modify the bytes.
//
if (!VirtualProtect((LPVOID)Src, Len, PAGE_READWRITE, &OldProtection))
{
PrintWinError("Failed setting the hook memory region protection", GetLastError());
}
ULONG_PTR RelativeAddr = (Dest - Src) - 5;
//
// Write the "jmp <address>" bytes into the target address.
//
*(BYTE*)Src = 0xE9; // JMP
*(ULONG_PTR*)(Src + 1) = RelativeAddr;
//
// NOP the remaining hook bytes to make sure the instructions will be properly aligned.
//
for (SIZE_T i = HookBytesLen; i < Len; i++)
{
*((BYTE*)Src + i) = 0x90;
}
//
// Restore the hook memory region permissions.
//
if (!VirtualProtect((LPVOID)Src, Len, OldProtection, &OldProtection))
{
PrintWinError("Failed setting the old memory protection", GetLastError());
}
//
// Return the jump back address (i.e. the address to return after our hook is executed).
//
return (LPVOID)(Src + Len);
}
VOID
HookAsmstdcall()
{
//
// Get the base address of the Golang module the gftrace DLL is injected into.
//
HMODULE GolangModuleBase = GetModuleHandleW(NULL);
if (GolangModuleBase == NULL)
{
PrintWinError("Failed to get the Golang module base address", GetLastError());
}
//
// Get the .text section header of the Golang module.
//
PIMAGE_SECTION_HEADER SectionHeader = GetSectionHeader((ULONG_PTR)GolangModuleBase, (BYTE*)".text");
if (SectionHeader == NULL)
{
PrintError("Failed to get a pointer to the Golang module .text section");
}
//
// Get the size of the .text section of the Golang module.
//
SIZE_T SectionSize = (SIZE_T)SectionHeader->Misc.VirtualSize;
if (!SectionSize)
{
PrintError("Golang module .text section size is zero");
}
#ifdef _WIN64
//
// https://github.com/golang/go/blob/master/src/runtime/sys_windows_amd64.s#L20
//
CHAR TargetAddrPattern[] = {
0x65, 0x48, 0x8B, 0x3C, 0x25, 0x30, 0x00, 0x00, 0x00, // mov rdi, qword ptr gs:[0x30]
0x8B, 0x47, 0x68, // mov eax, dword ptr ds:[rdi+0x68]
0x48, 0x89, 0x41, 0x28 // mov qword ptr ds:[rcx+0x28], rax
};
LPCSTR Mask = "xxxxxxxxxxxxxxxx";
SIZE_T NumberOfBytesToHook = 0x10;
#else
//
// https://github.com/golang/go/blob/master/src/runtime/sys_windows_386.s#L17
//
CHAR TargetAddrPattern[] = {
0x64, 0x8B, 0x05, 0x34, 0x00, 0x00, 0x00, // mov eax, dword ptr fs:[0x34]
0x89, 0x43, 0x14, // mov dword ptr ds:[ebx+0x14], eax
0xC3 // ret
};
LPCSTR Mask = "xxxxxxxxxxx";
SIZE_T NumberOfBytesToHook = 0x7;
#endif
//
// Attempt to find the target address we want to hook inside Asmstdcall function.
//
ULONG_PTR HookAddr = FindPattern((ULONG_PTR)GolangModuleBase, SectionSize, (LPCSTR)TargetAddrPattern, Mask);
if (!HookAddr)
{
PrintError("Failed to find Asmstdcall code pattern");
}
//
// Perform a mid function hook and set the address to jump back when the hooking function execution is done.
//
#ifdef _WIN64
JmpBackAddr = PerformHook((ULONG_PTR)HookAddr, (ULONG_PTR)AsmstdcallStub, NumberOfBytesToHook);
#else
JmpBackAddr = PerformHook32((ULONG_PTR)HookAddr, (ULONG_PTR)AsmstdcallStub, NumberOfBytesToHook);
#endif
}
VOID
hk_Asmstdcall(
_In_ PLIBCALL Frame
)
{
//
// Request the ownership of the critical section.
//
EnterCriticalSection(&CriticalSection);
//
// Get the address of the current Windows API function to be called by asmstdcall.
//
ULONG_PTR FuncAddr = Frame->FuncAddr;
//
// Make sure we avoid the IAT entries not set by the user.
//
for (SIZE_T i = 0; i < NumberOfIATEntries; i++)
{
if (FuncAddr == IatInfo[i].Addr && !IatInfo[i].IsAllowedToLog)
{
goto Exit;
}
}
//
// Check if we are ready to start to log the API calls to the user.
//
if (bIsReadyToLog)
{
ULONG_PTR Params = Frame->Argv;
ULONG_PTR ReturnValue = Frame->ReturnValue;
//
// Make sure we also trace API functions resolved after the Go runtime initialization.
//
if (FuncAddr == (ULONG_PTR)pGetProcAddress)
{
//
// Get the second parameter passed to GetProcAddress() function (i.e. lpProcName).
//
LPCSTR FuncName = (LPCSTR)(Params + 1);
//
// Go through our target function list and check if the function address resolved by GetProcAddress
// is in our list and if not, add it.
//
for (SIZE_T i = 0; i < NumberOfTargetFuncs; i++)
{
if (!strncmp(TargetFuncsInfo[i].Name, FuncName, strlen(FuncName) + 1) && TargetFuncsInfo[i].Addr == NULL)
{
TargetFuncsInfo[i].Addr = (FARPROC)ReturnValue;
}
}
}
//
// Check if the instructions in the received address is a JMP. If that's the case probably we are in a jump table.
// Programs compiled with cgo/gcc usually would have this table containing a JMP to the real IAT entry so we need to handle these cases.
//
// The JMP could be the IAT address address directly (x86) or an offset based on the current address (x64) hence we need to check our arch.
//
if (*(BYTE*)FuncAddr == 0xFF && *((BYTE*)FuncAddr + 1) == 0x25)
{
#ifdef _WIN64
DWORD offset = *(DWORD*)(FuncAddr + 2);
FARPROC RealFuncEntry = *(FARPROC)(FuncAddr + offset + 6);
#else
FARPROC RealFuncEntry = *(FARPROC)(FuncAddr + 2);
#endif
if (RealFuncEntry)
{
BOOL bFuncFound = FALSE;
//
// Check if the function address is present in the IAT to make sure we get the correct address.
//
if (HasImport(RealFuncEntry))
{
//
// Get the name of the imported function using it's IAT address.
//
LPCSTR FuncName = GetImportName(RealFuncEntry);
if (FuncName != NULL)
{
for (SIZE_T i = 0; i < NumberOfTargetFuncs; i++)
{
if (!strncmp(TargetFuncsInfo[i].Name, FuncName, strlen(FuncName) + 1))
{
TargetFuncsInfo[i].Addr = (FARPROC)FuncAddr;
bFuncFound = TRUE;
break;
}
}
for (SIZE_T i = 0; i < NumberOfIATEntries; i++)
{
if (!IatInfo[i].Addr)
{
if (bFuncFound)
{
IatInfo[i].IsAllowedToLog = TRUE;
}
IatInfo[i].Addr = FuncAddr;
break;
}
}
}
}
}
}
//
// Go through our target function list and check if the function called by Asmstdcall is wanted and if so, log it to the user.
//
for (SIZE_T i = 0; i < NumberOfTargetFuncs; i++)
{
FARPROC WantedFuncAddr = TargetFuncsInfo[i].Addr;
if (WantedFuncAddr)
{
if (FuncAddr == (ULONG_PTR)WantedFuncAddr)
{
if (!strcmp(TargetFuncsInfo[i].Name, "GetProcAddress"))
{
//
// Since this is a special case we have a function to print it.
//
LogGetProcAddressCall(Params, (FARPROC)ReturnValue);
}
else
{
DWORD Argc = Frame->Argc;
LogAPICall(TargetFuncsInfo[i].Name, Argc, Params, (DWORD)ReturnValue);
}
}
}
}
}
//
// Check if we should start to log the API calls by checking if the function called by Asmstdcall is GetCommandLineW().
// This function is part of the "os" package initialization and is called before the main package so we use it as a sentinel.
//
//
if (FuncAddr == (ULONG_PTR)pGetCommandLineW && !bIsReadyToLog)
{
bIsReadyToLog = TRUE;
//
// Resolve the address of the user-defined functions to trace and fills our TargetFuncInfo global list.
//
ResolveTargetFuncListAddresses();
//
// Attempt to create a console in case we are injected into a GUI application.
//
if (AllocConsole())
{
FILE* fp = NULL;
freopen_s(&fp, "CONOUT$", "w", stdout);
SetConsoleTitle(TEXT("gftrace"));
}
//
// Just some new line chars to make the output cleaner.
//
printf("\n\n");
}
Exit:
//
// Release ownership of the critical section.
//
LeaveCriticalSection(&CriticalSection);
}
================================================
FILE: tracer/hooks.h
================================================
#pragma once
#include <windows.h>
typedef struct LIBCALL
{
ULONG_PTR FuncAddr;
DWORD Argc;
ULONG_PTR Argv;
ULONG_PTR ReturnValue;
} LIBCALL, * PLIBCALL;
extern VOID AsmstdcallStub(VOID);
LPVOID JmpBackAddr;
LPVOID PerformHook(_In_ ULONG_PTR Src, _In_ ULONG_PTR Dest, _In_ SIZE_T Size);
LPVOID PerformHook32(_In_ ULONG_PTR Src, _In_ ULONG_PTR Dest, _In_ SIZE_T Size);
VOID HookAsmstdcall();
VOID hk_Asmstdcall(_In_ PLIBCALL Frame);
================================================
FILE: tracer/pe.c
================================================
#include "pe.h"
#include "utils.h"
PIMAGE_NT_HEADERS64
GetNtHeader(
_In_ ULONG_PTR ModuleBase
)
{
IMAGE_DOS_HEADER* DosHeader = (IMAGE_DOS_HEADER*)ModuleBase;
if (DosHeader->e_magic != IMAGE_DOS_SIGNATURE)
{
PrintError("The target process has an invalid DOS Signare");
}
PIMAGE_NT_HEADERS64 NtHeader = (IMAGE_NT_HEADERS64*)(ModuleBase + DosHeader->e_lfanew);
if (NtHeader->Signature != IMAGE_NT_SIGNATURE)
{
PrintError("The target process has an invalid PE Signare");
}
return NtHeader;
}
PIMAGE_NT_HEADERS32
GetNtHeader32(
_In_ ULONG_PTR ModuleBase
)
{
IMAGE_DOS_HEADER* DosHeader = (IMAGE_DOS_HEADER*)ModuleBase;
if (DosHeader->e_magic != IMAGE_DOS_SIGNATURE)
{
PrintError("The target process has an invalid DOS Signare");
}
PIMAGE_NT_HEADERS32 NtHeader = (IMAGE_NT_HEADERS32*)(ModuleBase + DosHeader->e_lfanew);
if (NtHeader->Signature != IMAGE_NT_SIGNATURE)
{
PrintError("The target process has an invalid PE Signare");
}
return NtHeader;
}
PIMAGE_EXPORT_DIRECTORY
GetExportDirectory(
_In_ ULONG_PTR ModuleBase
)
{
#ifdef _WIN64
PIMAGE_NT_HEADERS64 NtHeader = GetNtHeader(ModuleBase);
IMAGE_OPTIONAL_HEADER64 OptHeader = NtHeader->OptionalHeader;
#else
PIMAGE_NT_HEADERS32 NtHeader = GetNtHeader32(ModuleBase);
IMAGE_OPTIONAL_HEADER32 OptHeader = NtHeader->OptionalHeader;
#endif
IMAGE_DATA_DIRECTORY ExportDataDir = OptHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];
DWORD ExportDirRva = ExportDataDir.VirtualAddress;
if (!ExportDirRva)
{
return NULL;
}
return (PIMAGE_EXPORT_DIRECTORY)(ModuleBase + ExportDirRva);
}
PIMAGE_IMPORT_DESCRIPTOR
GetImportDesc(
_In_ ULONG_PTR ModuleBase
)
{
#ifdef _WIN64
PIMAGE_NT_HEADERS64 NtHeader = GetNtHeader(ModuleBase);
IMAGE_OPTIONAL_HEADER64 OptHeader = NtHeader->OptionalHeader;
#else
PIMAGE_NT_HEADERS32 NtHeader = GetNtHeader32(ModuleBase);
IMAGE_OPTIONAL_HEADER32 OptHeader = NtHeader->OptionalHeader;
#endif
IMAGE_DATA_DIRECTORY ImportDataDir = OptHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT];
DWORD ImportDirRva = ImportDataDir.VirtualAddress;
if (!ImportDirRva)
{
return NULL;
}
return (PIMAGE_IMPORT_DESCRIPTOR)(ModuleBase + ImportDirRva);
}
PIMAGE_SECTION_HEADER
GetSectionHeader(
_In_ ULONG_PTR ModuleBase,
_In_ BYTE* SectionName
)
{
#ifdef _WIN64
PIMAGE_NT_HEADERS64 NtHeader = GetNtHeader(ModuleBase);
#else
PIMAGE_NT_HEADERS32 NtHeader = GetNtHeader32(ModuleBase);
#endif
PIMAGE_SECTION_HEADER pSection = IMAGE_FIRST_SECTION(NtHeader);
DWORD NumberOfSections = NtHeader->FileHeader.NumberOfSections;
if (NumberOfSections == 0)
{
PrintError("The number of sections of the target process is zero");
}
for (SIZE_T i = 0; i < NumberOfSections; i++)
{
if (IsSameStr((BYTE*)pSection->Name, SectionName))
{
return pSection;
}
pSection++;
}
return NULL;
}
FARPROC
GetExportAddr(
_In_ LPCSTR ExportName
)
{
#ifdef _WIN64
PPEB Peb = (PPEB)__readgsqword(0x60);
#else
PPEB Peb = (PPEB)__readfsdword(0x30);
#endif
PLDR_DATA_TABLE_ENTRY CurrentModule = NULL;
PLIST_ENTRY CurrentEntry = Peb->Ldr->InLoadOrderModuleList.Flink;
FARPROC ExportAddr;
//
// Go through each loaded module and try to find the target export address using the given export name.
//
while (CurrentEntry != &Peb->Ldr->InLoadOrderModuleList && CurrentEntry != NULL)
{
CurrentModule = CONTAINING_RECORD(CurrentEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
ExportAddr = ResolveExportAddr((ULONG_PTR)CurrentModule->DllBase, ExportName);
if (ExportAddr != NULL)
{
return ExportAddr;
}
CurrentEntry = CurrentEntry->Flink;
}
return NULL;
}
FARPROC
ResolveExportAddr(
_In_ ULONG_PTR ModuleBase,
_In_ LPCSTR ExportName
)
{
PIMAGE_EXPORT_DIRECTORY ExportDir = GetExportDirectory(ModuleBase);
if (ExportDir == NULL)
{
return NULL;
}
DWORD AddressOfNameRva = ExportDir->AddressOfNames;
DWORD NumberOfNames = ExportDir->NumberOfNames;
DWORD AddressOfNameOrdinals = ExportDir->AddressOfNameOrdinals;
DWORD AddressOfFunctions = ExportDir->AddressOfFunctions;
for (SIZE_T i = 0; i < NumberOfNames; i++)
{
DWORD NameRva = *(DWORD*)(ModuleBase + AddressOfNameRva + i * sizeof(DWORD));
WORD OrdinalRva = *(WORD*)(ModuleBase + AddressOfNameOrdinals + i * sizeof(WORD));
LPCSTR Name = (LPCSTR)(ModuleBase + NameRva);
if (IsSameStr((BYTE*)ExportName, (BYTE*)Name))
{
DWORD ExportRva = *(DWORD*)(ModuleBase + AddressOfFunctions + OrdinalRva * sizeof(DWORD));
return (FARPROC)(ModuleBase + ExportRva);
}
}
return NULL;
}
LPCSTR
GetImportName(
_In_ FARPROC ImportAddr
)
{
HMODULE ModuleBase = GetModuleHandle(NULL);
PIMAGE_IMPORT_DESCRIPTOR ImportDesc = GetImportDesc((ULONG_PTR)ModuleBase);
if (ImportDesc == NULL)
{
return NULL;
}
PIMAGE_THUNK_DATA OriginalFirstThunk = (PIMAGE_THUNK_DATA)((ULONG_PTR)ModuleBase + ImportDesc->OriginalFirstThunk);
PIMAGE_THUNK_DATA FirstThunk = (PIMAGE_THUNK_DATA)((ULONG_PTR)ModuleBase + ImportDesc->FirstThunk);
SIZE_T i = 0;
while (ImportDesc[i++].OriginalFirstThunk)
{
while (OriginalFirstThunk->u1.Function)
{
if (!memcmp(&FirstThunk->u1.Function, ImportAddr, sizeof(FARPROC)))
{
PIMAGE_IMPORT_BY_NAME ImportName = (PIMAGE_IMPORT_BY_NAME)((ULONG_PTR)ModuleBase + OriginalFirstThunk->u1.AddressOfData);
return (LPCSTR)ImportName->Name;
}
OriginalFirstThunk++;
FirstThunk++;
}
}
return NULL;
}
BOOL
HasImport(
_In_ FARPROC ImportAddr
)
{
HMODULE ModuleBase = GetModuleHandleW(NULL);
PIMAGE_IMPORT_DESCRIPTOR ImportDesc = GetImportDesc((ULONG_PTR)ModuleBase);
if (ImportDesc == NULL)
{
return FALSE;
}
PIMAGE_THUNK_DATA FirstThunk = (PIMAGE_THUNK_DATA)((ULONG_PTR)ModuleBase + ImportDesc->FirstThunk);
SIZE_T i = 0;
while (ImportDesc[i++].FirstThunk)
{
while (FirstThunk->u1.Function)
{
if (!memcmp(&FirstThunk->u1.Function, ImportAddr, sizeof(FARPROC)))
{
return TRUE;
}
FirstThunk++;
}
}
return FALSE;
}
================================================
FILE: tracer/pe.h
================================================
#pragma once
#include <windows.h>
//
// Since we only need some fields of these structs there's no need to define all of them.
//
typedef struct _LDR_DATA_TABLE_ENTRY
{
LIST_ENTRY InLoadOrderLinks;
LIST_ENTRY InMemoryOrderLinks;
union
{
LIST_ENTRY InInitializationOrderLinks;
LIST_ENTRY InProgressLinks;
};
PVOID DllBase;
}LDR_DATA_TABLE_ENTRY, * PLDR_DATA_TABLE_ENTRY;
typedef struct _PEB_LDR_DATA
{
ULONG Length;
BOOLEAN Initialized;
HANDLE SsHandle;
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
} PEB_LDR_DATA, * PPEB_LDR_DATA;
typedef struct _PEB
{
BOOLEAN InheritedAddressSpace;
BOOLEAN ReadImageFileExecOptions;
BOOLEAN BeingDebugged;
union
{
BOOLEAN BitField;
struct
{
BOOLEAN ImageUsesLargePages : 1;
BOOLEAN IsProtectedProcess : 1;
BOOLEAN IsImageDynamicallyRelocated : 1;
BOOLEAN SkipPatchingUser32Forwarders : 1;
BOOLEAN IsPackagedProcess : 1;
BOOLEAN IsAppContainer : 1;
BOOLEAN IsProtectedProcessLight : 1;
BOOLEAN IsLongPathAwareProcess : 1;
} s1;
} u1;
HANDLE Mutant;
PVOID ImageBaseAddress;
PPEB_LDR_DATA Ldr;
} PEB, * PPEB;
PIMAGE_NT_HEADERS64 GetNtHeader(_In_ ULONG_PTR ModuleBase);
PIMAGE_NT_HEADERS32 GetNtHeader32(_In_ ULONG_PTR ModuleBase);
PIMAGE_SECTION_HEADER GetSectionHeader(_In_ ULONG_PTR ModuleBase, _In_ BYTE* SectionName);
PIMAGE_EXPORT_DIRECTORY GetExportDirectory(_In_ ULONG_PTR ModuleBase);
FARPROC GetExportAddr(_In_ LPCSTR ExportName);
FARPROC ResolveExportAddr(_In_ ULONG_PTR ModuleBase, _In_ LPCSTR ExportName);
PIMAGE_IMPORT_DESCRIPTOR GetImportDesc(_In_ ULONG_PTR ModuleBase);
BOOL HasImport(_In_ FARPROC ImportAddr);
LPCSTR GetImportName(_In_ FARPROC ImportAddr);
================================================
FILE: tracer/stub.asm
================================================
EXTERN JmpBackAddr: QWORD
EXTERN hk_Asmstdcall: PROC
.code
AsmstdcallStub PROC PUBLIC
; Execute the patched Asmstdcall instructions.
mov rdi, qword ptr gs:[30h]
mov eax, dword ptr [rdi+68h]
mov qword ptr [rcx+28h], rax
; Save RCX value.
push rcx
; Call the Asmstdcall hook.
call hk_Asmstdcall
; Restore RCX value.
pop rcx
; Jump back to the original Asmstdcall function after the hooking point.
jmp [JmpBackAddr]
AsmstdcallStub ENDP
END
================================================
FILE: tracer/stub32.asm
================================================
.MODEL flat, C
EXTERN JmpBackAddr: DWORD
EXTERN hk_Asmstdcall: PROC
ASSUME FS:NOTHING
.code
AsmstdcallStub PROC PUBLIC
; Execute the patched Asmstdcall instructions.
mov eax, dword ptr fs:[34h]
; Save EAX and EBX values.
push eax
push ebx
; Call the Asmstdcall hook.
call hk_Asmstdcall
; Restore EBX and EAX values.
pop ebx
pop eax
; Jump back to the original Asmstdcall function after the hooking point.
jmp [JmpBackAddr]
AsmstdcallStub ENDP
END
================================================
FILE: tracer/tracer.vcxproj
================================================
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup Label="ProjectConfigurations">
<ProjectConfiguration Include="Debug|Win32">
<Configuration>Debug</Configuration>
<Platform>Win32</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Release|Win32">
<Configuration>Release</Configuration>
<Platform>Win32</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Debug|x64">
<Configuration>Debug</Configuration>
<Platform>x64</Platform>
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<ImportGroup Label="ExtensionSettings">
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<PrecompiledHeader>Use</PrecompiledHeader>
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<EnableUAC>false</EnableUAC>
<ImageHasSafeExceptionHandlers>false</ImageHasSafeExceptionHandlers>
</Link>
<PostBuildEvent>
<Command>copy $(ProjectDir)\gftrace.cfg $(TargetDir)</Command>
</PostBuildEvent>
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================================================
FILE: tracer/tracer.vcxproj.filters
================================================
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup>
<Filter Include="Source Files">
<UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
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<UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
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<UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
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<ClCompile Include="dllmain.c">
<Filter>Source Files</Filter>
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<Filter>Source Files</Filter>
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<Filter>Source Files</Filter>
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<Filter>Source Files</Filter>
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<Filter>Header Files</Filter>
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<Filter>Header Files</Filter>
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<Filter>Header Files</Filter>
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<MASM Include="stub.asm">
<Filter>Source Files</Filter>
</MASM>
<MASM Include="stub32.asm">
<Filter>Source Files</Filter>
</MASM>
</ItemGroup>
</Project>
================================================
FILE: tracer/utils.c
================================================
#include "utils.h"
#include "pe.h"
VOID
PrintError(
_In_ LPCSTR Msg
)
{
printf("\n[!] Error: %s!\n", Msg);
ExitProcess(0);
}
VOID
PrintWinError(
_In_ LPCSTR Msg,
_In_ DWORD ErrorCode
)
{
printf("\n[!] Error: %s!\n[!] Error code: %u\n", Msg, ErrorCode);
ExitProcess(0);
}
ULONG_PTR
FindPattern(
_In_ ULONG_PTR BaseAddr,
_In_ SIZE_T Size,
_In_ LPCSTR BytePattern,
_In_ LPCSTR Mask
)
{
SIZE_T PatternSize = strlen(Mask);
BOOL bFound;
for (SIZE_T i = 0; i < Size - PatternSize; i++)
{
bFound = TRUE;
for (SIZE_T j = 0; j < PatternSize; j++)
{
bFound &= Mask[j] == '?' || BytePattern[j] == *((LPCSTR)BaseAddr + i + j);
}
if (bFound)
{
return (ULONG_PTR)(BaseAddr + i);
}
}
return 0;
}
VOID
LogAPICall(
_In_ LPCSTR FuncName,
_In_ DWORD Argc,
_In_ ULONG_PTR Params,
_In_ DWORD ReturnValue
)
{
char* TempBuffer = calloc(MAX_STR_SIZE, 1);
char FinalString[MAX_STR_SIZE] = {0};
SIZE_T Size = MAX_STR_SIZE;
snprintf(TempBuffer, Size, "- %s(", FuncName);
strncat_s(FinalString, Size, TempBuffer, _TRUNCATE);
//
// Build the log entry string using the provided info (i.e. FuncName, Argc, Params, ReturnValue).
//
for (SIZE_T i = 0; i < Argc; i++)
{
ULONG_PTR Argv = *((ULONG_PTR*)Params + i);
//
// Try to guess if the argument is a string, an address or simply a number and print it properly.
//
if (IsWideStr((BYTE*)Argv))
{
LPCWSTR StrArg = (LPCWSTR)Argv;
if (wcslen((LPCWSTR)Argv) > 2048)
{
StrArg = L"[string is too large]";
}
snprintf(TempBuffer, Size, "\"%ws\"", StrArg);
strncat_s(FinalString, Size, TempBuffer, _TRUNCATE);
}
else
{
snprintf(TempBuffer, Size, "0x%llx", Argv);
strncat_s(FinalString, Size, TempBuffer, _TRUNCATE);
}
if (Argc > i + 1)
{
snprintf(TempBuffer, Size, ", ");
strncat_s(FinalString, Size, TempBuffer, _TRUNCATE);
}
}
snprintf(TempBuffer, Size, ") = 0x%lx (%d)", ReturnValue, (INT)ReturnValue);
strncat_s(FinalString, Size, TempBuffer, _TRUNCATE);
//
// Print the final log entry string.
//
puts(FinalString);
free(TempBuffer);
}
VOID
LogGetProcAddressCall(
_In_ ULONG_PTR Params,
_In_ FARPROC ReturnValue
)
{
char* TempBuffer = calloc(MAX_STR_SIZE, 1);
char FinalString[MAX_STR_SIZE] = {0};
SIZE_T Size = MAX_STR_SIZE;
snprintf(TempBuffer, Size, "- GetProcAddress(");
strncat_s(FinalString, Size, TempBuffer, _TRUNCATE);
HMODULE ModuleBase = (HMODULE) * ((ULONG_PTR*)Params + 0);
snprintf(TempBuffer, Size, "0x%llx, ", ModuleBase);
strncat_s(FinalString, Size, TempBuffer, _TRUNCATE);
LPCSTR ExportName = (LPCSTR) * ((ULONG_PTR*)Params + 1);
snprintf(TempBuffer, Size, "\"%s\"", ExportName);
strncat_s(FinalString, Size, TempBuffer, _TRUNCATE);
snprintf(TempBuffer, Size, ") = 0x%llx", ReturnValue);
strncat_s(FinalString, Size, TempBuffer, _TRUNCATE);
//
// Print the final log entry string.
//
puts(FinalString);
free(TempBuffer);
}
/*
* Since we are not using API signatures to know what is the type of each parameter we need to try to guess what it is.
* That's not good in general and handle these scenarios can be a pain. The implementation bellow is very bad but at
* least it works "ok" guessing if the provided address is a wide string or not.
*
* TODO: improve the function bellow.
*/
BOOL
IsWideStr(
_In_ BYTE* Addr
)
{
if (!IsValidStrMem((LPCVOID)Addr))
{
return FALSE;
}
WORD RequiredLen = 6;
for (SIZE_T i = 0; i < RequiredLen; i += 2)
{
if (Addr[i] > 0x7e || Addr[i] < 0x20 || Addr[i + 1] != '\0')
{
return FALSE;
}
}
return TRUE;
}
BOOL
IsValidStrMem(
_In_ LPCVOID Addr
)
{
if (!Addr)
{
return FALSE;
}
HANDLE hProcess = GetCurrentProcess();
MEMORY_BASIC_INFORMATION Mbi = {0};
if (!VirtualQueryEx(hProcess, Addr, &Mbi, sizeof(Mbi)) && GetLastError() != ERROR_INVALID_PARAMETER)
{
PrintWinError("Failed to query virtual memory", GetLastError());
}
return Mbi.Protect == PAGE_READWRITE;
}
BOOL
IsSameStr(
_In_ BYTE* Str1,
_In_ BYTE* Str2
)
{
if (!Str1 || !Str2)
{
return FALSE;
}
SIZE_T StrLen1 = strlen(Str1);
SIZE_T StrLen2 = strlen(Str2);
if (StrLen1 != StrLen2)
{
return FALSE;
}
for (SIZE_T i = 0; i < StrLen1; i++)
{
char c1 = Str1[i];
char c2 = Str2[i];
c1 = tolower(c1);
c2 = tolower(c2);
if (c1 != c2)
{
return FALSE;
}
}
return TRUE;
}
VOID
InitTargetFuncList()
{
char ConfigFileFullPath[MAX_PATH] = {0};
char CurrentModuleFilepath[MAX_PATH] = {0};
#ifdef _WIN64
LPCSTR ModuleName = "gftrace.dll";
#else
LPCSTR ModuleName = "gftrace32.dll";
#endif
DWORD Len = GetModuleFileNameA(GetModuleHandleA(ModuleName), CurrentModuleFilepath, MAX_PATH);
if (!Len)
{
PrintWinError("Failed to get the gftrace.dll module filepath", GetLastError());
}
for (SIZE_T i = Len - 1; i > 0; i--)
{
if (CurrentModuleFilepath[i] == 0x5c || CurrentModuleFilepath[i] == 0x2f)
{
CurrentModuleFilepath[i + 1] = '\0';
break;
}
}
SIZE_T i = 0;
do
{
ConfigFileFullPath[i] = CurrentModuleFilepath[i];
i++;
} while (CurrentModuleFilepath[i] != '\0');
LPCSTR ConfigFilename = "\\gftrace.cfg";
SIZE_T ConfigFullPathSize = strlen(ConfigFileFullPath) + strlen(ConfigFilename) + 1;
//
// Build the gftrace.cfg full path.
//
strncat_s(ConfigFileFullPath, ConfigFullPathSize, ConfigFilename, _TRUNCATE);
//
// Check if the gftrace.cfg file exists in the expected directory.
//
if (GetFileAttributesA((LPCSTR)ConfigFileFullPath) == INVALID_FILE_ATTRIBUTES && GetLastError() == ERROR_FILE_NOT_FOUND)
{
PrintError("Failed to find the gftrace.cfg file in the current directory");
}
HANDLE hFile = CreateFileA(ConfigFileFullPath, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
{
PrintWinError("Failed to open the config file", GetLastError());
}
DWORD FileSizeHigh = 0;
DWORD FileSize = GetFileSize(hFile, &FileSizeHigh);
if (FileSize == INVALID_FILE_SIZE)
{
CloseHandle(hFile);
PrintWinError("Failed to get config file size", GetLastError());
}
BYTE* FileContent = calloc(FileSize, 1);
DWORD NumberOfBytesRead;
if (!ReadFile(hFile, (LPVOID)FileContent, FileSize, &NumberOfBytesRead, NULL))
{
CloseHandle(hFile);
PrintWinError("Failed to read the config file content", GetLastError());
}
NumberOfTargetFuncs = 0;
//
// Calculate the provided user list length.
//
// TODO: improve the code bellow.
//
for (SIZE_T i = 0; i <= FileSize; i++)
{
if (FileContent[i] == ',' || i == FileSize)
{
NumberOfTargetFuncs++;
}
}
SIZE_T ListSize = NumberOfTargetFuncs * sizeof(FUNCINFO);
HANDLE hHeap = GetProcessHeap();
if (hHeap == NULL)
{
CloseHandle(hFile);
PrintWinError("Failed to get process heap", GetLastError());
}
//
// Allocate memory for our global target function list.
//
TargetFuncsInfo = HeapAlloc(hHeap, HEAP_ZERO_MEMORY, ListSize);
if (TargetFuncsInfo == NULL)
{
CloseHandle(hFile);
PrintWinError("Failed to allocate memory for the target function list", GetLastError());
}
LPCSTR TmpFuncName;
SIZE_T j = 0;
//
// Go through the user-defined list and set each function name into our global function list.
//
// TODO: improve the code bellow.
//
for (SIZE_T i = 0, x = 0; i <= FileSize; i++)
{
if (FileContent[i] == ',')
{
FileContent[i] = '\0';
TmpFuncName = _strdup((LPCSTR)&FileContent[j]);
if (TmpFuncName == NULL)
{
CloseHandle(hFile);
PrintError("Failed to strdup API function name");
}
TargetFuncsInfo[x].Name = TmpFuncName;
x++;
j = i + 1;
continue;
}
if (i == FileSize)
{
FileContent[i] = '\0';
TmpFuncName = _strdup((LPCSTR)&FileContent[j]);
if (TmpFuncName == NULL)
{
CloseHandle(hFile);
PrintError("Failed to strdup the API function name");
}
TargetFuncsInfo[x].Name = TmpFuncName;
break;
}
}
CloseHandle(hFile);
}
VOID
ResolveTargetFuncListAddresses()
{
//
// Go through each function name in our global list, resolve it's export address and add it to the list.
//
for (SIZE_T i = 0; i < NumberOfTargetFuncs; i++)
{
FARPROC ExportAddr = GetExportAddr(TargetFuncsInfo[i].Name);
TargetFuncsInfo[i].Addr = ExportAddr;
}
}
VOID
InitIATDenyList()
{
HMODULE ModuleBase = GetModuleHandleW(NULL);
PIMAGE_IMPORT_DESCRIPTOR ImportDesc = GetImportDesc((ULONG_PTR)ModuleBase);
if (ImportDesc == NULL)
{
PrintError("Import Descriptor is NULL");
}
PIMAGE_THUNK_DATA FirstThunk = (PIMAGE_THUNK_DATA)((ULONG_PTR)ModuleBase + ImportDesc->FirstThunk);
if (!FirstThunk)
{
PrintError("First Thunk is 0");
}
NumberOfIATEntries = 0;
SIZE_T i = 0;
while (ImportDesc[i++].FirstThunk)
{
while (FirstThunk->u1.Function)
{
NumberOfIATEntries++;
FirstThunk++;
}
}
HANDLE hHeap = GetProcessHeap();
if (hHeap == NULL)
{
PrintWinError("Failed to get process heap", GetLastError());
}
SIZE_T ListSize = NumberOfIATEntries * sizeof(IATINFO);
IatInfo = HeapAlloc(hHeap, HEAP_ZERO_MEMORY, ListSize);
if (IatInfo == NULL)
{
PrintWinError("Failed to allocate memory for the deny function list", GetLastError());
}
for (SIZE_T i = 0; i < NumberOfIATEntries; i++)
{
IatInfo[i].Addr = 0;
IatInfo[i].IsAllowedToLog = FALSE;
}
}
================================================
FILE: tracer/utils.h
================================================
#pragma once
#include <windows.h>
#include <stdio.h>
#include <string.h>
#define MAX_STR_SIZE 8192
typedef struct FUNCINFO
{
LPCSTR Name;
FARPROC Addr;
} FUNCINFO;
struct FUNCINFO* TargetFuncsInfo;
typedef struct IATINFO
{
ULONG_PTR Addr;
BOOL IsAllowedToLog;
} IATINFO;
struct IATINFO* IatInfo;
CRITICAL_SECTION CriticalSection;
DWORD NumberOfTargetFuncs;
DWORD NumberOfIATEntries;
FARPROC pGetCommandLineW;
FARPROC pGetProcAddress;
BOOL bIsReadyToLog;
VOID PrintError(_In_ LPCSTR Msg);
VOID PrintWinError(_In_ LPCSTR Msg, _In_ DWORD ErrorCode);
ULONG_PTR FindPattern(_In_ ULONG_PTR BaseAddr, _In_ SIZE_T Size, _In_ LPCSTR BytePattern, _In_ LPCSTR Mask);
VOID LogAPICall(_In_ LPCSTR FuncName, _In_ DWORD Argc, _In_ ULONG_PTR Params, _In_ DWORD ReturnValue);
VOID LogGetProcAddressCall(_In_ ULONG_PTR Params, _In_ FARPROC ReturnValue);
BOOL IsWideStr(_In_ BYTE* Addr);
BOOL IsSameStr(_In_ BYTE* TargetName, _In_ BYTE* Str);
BOOL IsValidStrMem(_In_ LPCVOID Addr);
VOID InitTargetFuncList();
VOID ResolveTargetFuncListAddresses();
VOID InitIATDenyList();
gitextract_ge7tbwtn/
├── .gitattributes
├── .gitignore
├── LICENSE
├── README.md
├── injector/
│ ├── injector.c
│ ├── injector.vcxproj
│ └── injector.vcxproj.filters
└── tracer/
├── dllmain.c
├── gftrace.cfg
├── hooks.c
├── hooks.h
├── pe.c
├── pe.h
├── stub.asm
├── stub32.asm
├── tracer.vcxproj
├── tracer.vcxproj.filters
├── utils.c
└── utils.h
SYMBOL INDEX (35 symbols across 8 files) FILE: injector/injector.c function main (line 4) | int main(int argc, char** argv) FILE: tracer/dllmain.c function VOID (line 4) | VOID function BOOL (line 58) | BOOL WINAPI DllMain( FILE: tracer/hooks.c function LPVOID (line 7) | LPVOID function LPVOID (line 58) | LPVOID function VOID (line 106) | VOID function VOID (line 185) | VOID FILE: tracer/hooks.h type LIBCALL (line 5) | typedef struct LIBCALL FILE: tracer/pe.c function PIMAGE_NT_HEADERS64 (line 4) | PIMAGE_NT_HEADERS64 function PIMAGE_NT_HEADERS32 (line 26) | PIMAGE_NT_HEADERS32 function PIMAGE_EXPORT_DIRECTORY (line 48) | PIMAGE_EXPORT_DIRECTORY function PIMAGE_IMPORT_DESCRIPTOR (line 72) | PIMAGE_IMPORT_DESCRIPTOR function PIMAGE_SECTION_HEADER (line 96) | PIMAGE_SECTION_HEADER function FARPROC (line 129) | FARPROC function FARPROC (line 163) | FARPROC function LPCSTR (line 198) | LPCSTR function BOOL (line 233) | BOOL FILE: tracer/pe.h type LDR_DATA_TABLE_ENTRY (line 8) | typedef struct _LDR_DATA_TABLE_ENTRY type PEB_LDR_DATA (line 20) | typedef struct _PEB_LDR_DATA type PEB (line 30) | typedef struct _PEB FILE: tracer/utils.c function VOID (line 4) | VOID function VOID (line 13) | VOID function ULONG_PTR (line 23) | ULONG_PTR function VOID (line 52) | VOID function VOID (line 112) | VOID function BOOL (line 152) | BOOL function BOOL (line 175) | BOOL function BOOL (line 196) | BOOL function VOID (line 232) | VOID function VOID (line 397) | VOID function VOID (line 410) | VOID FILE: tracer/utils.h type FUNCINFO (line 9) | typedef struct FUNCINFO type FUNCINFO (line 15) | struct FUNCINFO type IATINFO (line 17) | typedef struct IATINFO type IATINFO (line 23) | struct IATINFO
Condensed preview — 19 files, each showing path, character count, and a content snippet. Download the .json file or copy for the full structured content (109K chars).
[
{
"path": ".gitattributes",
"chars": 2518,
"preview": "###############################################################################\n# Set default behavior to automatically "
},
{
"path": ".gitignore",
"chars": 80,
"preview": "# Visual Studio Files\n.vs/\n*.opensdf\n*.sdf\n*.suo\n*.sln\n*.user\nx64/\nRelease\nDebug"
},
{
"path": "LICENSE",
"chars": 35149,
"preview": " GNU GENERAL PUBLIC LICENSE\n Version 3, 29 June 2007\n\n Copyright (C) 2007 Free "
},
{
"path": "README.md",
"chars": 9349,
"preview": "# gftrace\n\nA command line Windows API tracing tool for Golang binaries.\n\n**Note:** This tool is a PoC and a work-in-prog"
},
{
"path": "injector/injector.c",
"chars": 5431,
"preview": "#include <stdio.h>\n#include <windows.h>\n\nint main(int argc, char** argv)\n{\n if (argc < 2)\n {\n printf(\"Usage"
},
{
"path": "injector/injector.vcxproj",
"chars": 7213,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<Project DefaultTargets=\"Build\" xmlns=\"http://schemas.microsoft.com/developer/msb"
},
{
"path": "injector/injector.vcxproj.filters",
"chars": 956,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<Project ToolsVersion=\"4.0\" xmlns=\"http://schemas.microsoft.com/developer/msbuil"
},
{
"path": "tracer/dllmain.c",
"chars": 2004,
"preview": "#include \"utils.h\"\n#include \"hooks.h\"\n\nVOID\nInit()\n{\n //\n // Get kernel32.dll module base address.\n //\n HMOD"
},
{
"path": "tracer/gftrace.cfg",
"chars": 1475,
"preview": "CreateFileW,ReadFile,WriteFile,MoveFileW,DeleteFileW,SetFilePointerEx,CopyFileW,FindFirstFileW,SetFileAttributesW,GetCur"
},
{
"path": "tracer/hooks.c",
"chars": 9242,
"preview": "#include \"hooks.h\"\n#include \"utils.h\"\n#include \"pe.h\"\n\nbIsReadyToLog = FALSE;\n\nLPVOID\nPerformHook(\n\t_In_ ULONG_PTR Src,\n"
},
{
"path": "tracer/hooks.h",
"chars": 439,
"preview": "#pragma once\n\n#include <windows.h>\n\ntypedef struct LIBCALL\n{\n\tULONG_PTR FuncAddr;\n\tDWORD Argc;\n\tULONG_PTR Argv;\n\tULONG_P"
},
{
"path": "tracer/pe.c",
"chars": 5914,
"preview": "#include \"pe.h\"\n#include \"utils.h\"\n\nPIMAGE_NT_HEADERS64\nGetNtHeader(\n\t_In_ ULONG_PTR ModuleBase\n)\n{\n\tIMAGE_DOS_HEADER* D"
},
{
"path": "tracer/pe.h",
"chars": 1908,
"preview": "#pragma once\n\n#include <windows.h>\n\n//\n// Since we only need some fields of these structs there's no need to define all "
},
{
"path": "tracer/stub.asm",
"chars": 492,
"preview": "EXTERN JmpBackAddr: QWORD\nEXTERN hk_Asmstdcall: PROC\n\n.code\nAsmstdcallStub PROC PUBLIC\n\n ; Execute the patched Asmstd"
},
{
"path": "tracer/stub32.asm",
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"preview": ".MODEL flat, C\n\nEXTERN JmpBackAddr: DWORD\nEXTERN hk_Asmstdcall: PROC\n\nASSUME FS:NOTHING\n\n.code\nAsmstdcallStub PROC PUBLI"
},
{
"path": "tracer/tracer.vcxproj",
"chars": 8951,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<Project DefaultTargets=\"Build\" xmlns=\"http://schemas.microsoft.com/developer/msb"
},
{
"path": "tracer/tracer.vcxproj.filters",
"chars": 1687,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<Project ToolsVersion=\"4.0\" xmlns=\"http://schemas.microsoft.com/developer/msbuil"
},
{
"path": "tracer/utils.c",
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"preview": "#include \"utils.h\"\n#include \"pe.h\"\n\nVOID\nPrintError(\n\t_In_ LPCSTR Msg\n)\n{\n\tprintf(\"\\n[!] Error: %s!\\n\", Msg);\n\tExitProce"
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{
"path": "tracer/utils.h",
"chars": 1068,
"preview": "#pragma once\n\n#include <windows.h>\n#include <stdio.h>\n#include <string.h>\n\n#define MAX_STR_SIZE 8192\n\ntypedef struct FUN"
}
]
About this extraction
This page contains the full source code of the leandrofroes/gftrace GitHub repository, extracted and formatted as plain text for AI agents and large language models (LLMs). The extraction includes 19 files (101.2 KB), approximately 27.4k tokens, and a symbol index with 35 extracted functions, classes, methods, constants, and types. Use this with OpenClaw, Claude, ChatGPT, Cursor, Windsurf, or any other AI tool that accepts text input. You can copy the full output to your clipboard or download it as a .txt file.
Extracted by GitExtract — free GitHub repo to text converter for AI. Built by Nikandr Surkov.