diegosouzapw Anti-Cheat Systems & Analysis
Overview
This skill covers anti-cheat systems used in games, their detection mechanisms, and research techniques. Understanding anti-cheat helps both defenders (game developers) and security researchers.
Major Anti-Cheat Systems
Easy Anti-Cheat (EAC)
- Kernel-mode driver protection
- Process integrity verification
- Memory scanning
- Used by: Fortnite, Apex Legends, Rust
BattlEye
- Kernel driver with ring-0 access
- Screenshot capture capability
- Network traffic analysis
- Used by: PUBG, Rainbow Six Siege, DayZ
Vanguard (Riot Games)
- Always-on kernel driver
- Boot-time initialization
- Hypervisor detection
- Used by: Valorant, League of Legends
Valve Anti-Cheat (VAC)
- User-mode detection
- Signature-based scanning
- Delayed ban waves
- Used by: CS2, Dota 2, TF2
Other Systems
- PunkBuster: Legacy FPS anti-cheat
- FairFight: Server-side statistical analysis
- nProtect GameGuard: Korean anti-cheat solution
- XIGNCODE3: Mobile game protection
- ACE (Tencent): Chinese market protection
Detection Mechanisms
Memory Detection
- Signature scanning for known cheats
- Code integrity verification
- Injected module detection
- Memory modification monitoring
Process Detection
- Handle enumeration
- Thread context inspection
- Debug register monitoring
- Stack trace analysis
Kernel-Level Detection
- Driver verification
- Callback registration monitoring
- System call hooking detection
- PatchGuard integration
Behavioral Analysis
- Input pattern analysis
- Movement anomaly detection
- Statistical improbability flagging
- Network packet inspection
Anti-Cheat Architecture
User-Mode Components
- Process scanner
- Module verifier
- Overlay detector
- Screenshot capture
Kernel-Mode Components
- Driver loader
- Memory protection
- System callback registration
- Hypervisor detection
Server-Side Components
- Statistical analysis
- Replay verification
- Report processing
- Ban management
Research Techniques
Static Analysis
- Dump and analyze AC drivers
- Reverse engineer detection routines
- Identify signature patterns
- Map callback registrations
Dynamic Analysis
- Monitor system calls
- Track driver communications
- Analyze network traffic
- Debug with hypervisor tools
Bypass Categories
Memory Access
- Physical memory read/write
- DMA-based access
- Hypervisor memory virtualization
- Driver-based access
Code Execution
- Manual mapping
- Thread hijacking
- APC injection
- Kernel callbacks
Detection Evasion
- Signature mutation
- Timing attack mitigation
- Stack spoofing
- Module hiding
Security Features Interaction
Windows Security
- Driver Signature Enforcement (DSE)
- PatchGuard/Kernel Patch Protection
- Hypervisor Code Integrity (HVCI)
- Secure Boot
Virtualization
- VT-x/AMD-V detection
- Hypervisor presence checks
- VM escape detection
- Timing-based detection
Ethical Considerations
Research Guidelines
- Focus on understanding, not exploitation
- Report vulnerabilities responsibly
- Respect Terms of Service implications
- Consider impact on gaming communities
Legal Aspects
- DMCA considerations
- CFAA implications
- Regional regulations
- ToS enforcement
Resources Organization
Detection Research
- Anti-cheat driver analysis
- Detection routine documentation
- Callback enumeration tools
Bypass Research
- Memory access techniques
- Injection methods
- Evasion strategies
Tools
- Custom debuggers
- Driver loaders
- Analysis frameworks