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Awesome Open Source


Hook WinAPI functions used by Valve Anti-Cheat. Log calls and intercept arguments & return values. DLL written in C.

Getting started


Microsoft Visual Studio 2019 (preferably latest version i.e. 16.1.6), platform toolset v142 and Windows SDK 10.0 are required in order to compile vac-hooks. If you don't have ones, you can download VS here (Windows SDK is installed during Visual Studio Setup).


The very first step in order to compile vac-hooks is to clone this repo from GitHub to your local computer. Git is required to step futher, if not installed download it here. Open git bash / git cmd / cmd and enter following command:

git clone

vac-hooks folder should have been succesfully created, containing all the source files.

Compiling from source

When you have equiped a copy of source code, next step is opening vac-hooks.sln in Microsoft Visual Studio 2019.

Then change build configuration to Release | x86 and simply press Build solution.

If everything went right you should receive vac-hooks.dll binary file.


Open Steam as Administrator, then open your favorite DLL injector (as an admin too) and inject vac-hooks.dll into Steam.exe process.

After injection you should see vac-hooks.txt log file in Steam installation directory (e.g. C:\Program Files (x86)\Steam). The log file contains names of WinAPI functions being called by VAC, their parameters and return values.

See also

  • VAC - source code of Valve Anti-Cheat obtained from disassembly of compiled modules

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