This repository contains reverse engineered implementations of key VAC (Valve Anti-Cheat) functions, presented in a clean, documented format. This work represents a partial reconstruction of VAC's internal mechanisms based on static analysis and reverse engineering.
The best defense comes from understanding the offense. Security through knowledge, not obscurity.
- This is demonstration code - it cannot be compiled or executed as-is
- The code shows the internal structure and logic of VAC components
- Many more data collection mechanisms exist in VAC beyond what's shown here
- Further research and implementation is left as an exercise for the reader
- Anti-Debugging Module
- CPUID Analyzer
- System Handle Scanner
- Hardware Device Scanner
- Process Analysis
- Process Informer
This reverse engineering effort reveals:
- Detection Vectors: VAC collects extensive system information including hardware signatures, process details, and system timing
- Evasion Techniques: Multiple fallback mechanisms when primary detection fails
- Data Structures: Complex context structures for managing analysis state
- Obfuscation: String encryption and API name obfuscation throughout
The code maintains the exact structure and logic found in VAC while adding comprehensive documentation. Comments explain both the "what" and "why" of each operation.
- This represents only a subset of VAC's capabilities
- Many detection mechanisms are not included
This is primarily a research documentation project. If you discover additional VAC mechanisms or have corrections to the existing analysis, feel free to contribute.
This research is conducted for educational purposes to understand anti-cheat technology. The author does not condone or support the circumvention of anti-cheat systems. Use this information responsibly and in accordance with applicable laws and terms of service.