Game Hacking Techniques

Game Hacking Techniques

Overview

This skill covers game-hacking techniques documented in the awesome-game-security collection, with emphasis on how cheats move from user mode to kernel mode, hypervisors, and DMA when defenders raise the bar. It is best used to understand the offensive side of the threat model that anti-cheat systems are designed to detect.

README Coverage

• Cheat > Debugging
• Cheat > Packet Sniffer&Filter
• Cheat > SpeedHack
• Cheat > Injection:*
• Cheat > Hook
• Cheat > RPM
• Cheat > DMA
• Cheat > W2S
• Cheat > Overlay
• Cheat > Driver Communication
• Cheat > HWID
• Cheat > Game Engine Explorer:*
• Cheat > Explore AntiCheat System:*
• Cheat > Game:*

Escalation Model

User-Mode

• Read and write process memory
• Inject DLLs or shellcode
• Hook graphics or input APIs

Kernel-Mode

• Use signed or vulnerable drivers for direct memory access
• Bypass handle-based protections and inspect protected processes
• Interact with callbacks, page tables, or kernel objects directly

Below the OS

• Virtualize the system with a hypervisor
• Read memory through PCIe DMA hardware
• Move logic to external devices or secondary machines

Core Concepts

Memory Manipulation

• Read Process Memory (RPM)
• Write Process Memory (WPM)
• Pattern scanning
• Pointer chains
• Structure reconstruction

Process Injection

• DLL injection methods
• Manual mapping
• Shellcode injection
• Thread hijacking
• APC injection

Hooking Techniques

• Inline hooking (detours)
• IAT/EAT hooking
• VTable hooking
• Hardware breakpoint hooks
• Syscall hooking

Cheat Categories

Visual Cheats (ESP)

- World-to-Screen transformation
- Player/entity rendering
- Box ESP, skeleton ESP
- Item highlighting
- Radar/minimap hacks

Aim Assistance

- Aimbot algorithms
- Triggerbot (auto-fire)
- No recoil/no spread
- Bullet prediction
- Silent aim

Movement Cheats

- Speed hacks
- Fly hacks
- No clip
- Teleportation
- Bunny hop automation

Miscellaneous

- Wallhacks
- Skin changers
- Unlock all
- Economy manipulation

Overlay & Rendering

Overlay Methods

• DirectX Hook: D3D9/11/12 Present hook
• Vulkan Hook: vkQueuePresentKHR hook
• OpenGL Hook: wglSwapBuffers hook
• DWM Overlay: Desktop Window Manager
• External Window: Transparent overlay window
• Steam Overlay: Hijacking Steam's overlay
• NVIDIA Overlay: GeForce Experience hijack

Rendering Libraries

• Dear ImGui: Immediate mode GUI
• GDI/GDI+: Windows graphics
• Direct2D: Hardware-accelerated 2D

Memory Access Methods

User-Mode

- OpenProcess + ReadProcessMemory
- NtReadVirtualMemory
- Memory-mapped files
- Shared memory sections

Kernel-Mode

- Driver-based access
- Physical memory access
- MDL-based copying
- KeStackAttachProcess

Advanced Methods

- DMA (Direct Memory Access)
- EFI runtime services
- Hypervisor-based access
- Hardware-based (FPGA)

Driver Communication

Methods

• IOCTL-based
• Shared memory
• Registry callbacks
• Syscall hooks
• Data pointer swaps

Common Patterns

// Data pointer swap example
NtUserGetObjectInformation
NtConvertBetweenAuxiliaryCounterAndPerformanceCounter
Win32k syscall hooks

World-to-Screen Calculation

Basic Formula

Vector2 WorldToScreen(Vector3 worldPos, Matrix viewMatrix) {
    Vector4 clipCoords;
    clipCoords.x = worldPos.x * viewMatrix[0] + worldPos.y * viewMatrix[4] + 
                   worldPos.z * viewMatrix[8] + viewMatrix[12];
    clipCoords.y = worldPos.x * viewMatrix[1] + worldPos.y * viewMatrix[5] + 
                   worldPos.z * viewMatrix[9] + viewMatrix[13];
    clipCoords.w = worldPos.x * viewMatrix[3] + worldPos.y * viewMatrix[7] + 
                   worldPos.z * viewMatrix[11] + viewMatrix[15];
    
    if (clipCoords.w < 0.1f) return invalid;
    
    Vector2 NDC;
    NDC.x = clipCoords.x / clipCoords.w;
    NDC.y = clipCoords.y / clipCoords.w;
    
    Vector2 screen;
    screen.x = (screenWidth / 2) * (NDC.x + 1);
    screen.y = (screenHeight / 2) * (1 - NDC.y);
    
    return screen;
}

Engine-Specific Techniques

Unity (Mono)

• Assembly-CSharp.dll analysis
• Mono JIT hooking
• Il2CppDumper for IL2CPP builds
• Method address resolution

Unity (IL2CPP)

• GameAssembly.dll analysis
• Metadata recovery
• Type reconstruction
• Native hooking

Unreal Engine

• GObjects/GNames enumeration
• UWorld traversal
• SDK generation (Dumper-7)
• Blueprint hooking

Source Engine

• Entity list enumeration
• NetVars parsing
• ConVar manipulation
• Signature scanning

Input Simulation

Methods

• SendInput API
• mouse_event/keybd_event
• DirectInput hooking
• Raw input injection
• Driver-based input (mouclass)

Kernel-Level

• Mouse class service callback
• Keyboard filter drivers
• HID manipulation

Anti-Detection Techniques

Code Protection

• Polymorphic code
• Code virtualization
• Anti-dump techniques
• String encryption

Runtime Evasion

• Stack spoofing
• Return address manipulation
• Thread context hiding
• Module concealment

Development Workflow

External Cheat

1. Pattern scan for signatures
2. Read game memory externally
3. Process data in separate process
4. Render overlay or use input simulation

Internal Cheat

1. Inject into game process
2. Hook rendering functions
3. Access game objects directly
4. Render through game's graphics context

Learning Resources

Communities

• UnknownCheats
• GuidedHacking
• Game Hacking Academy

Practice Targets

• PWN Adventure (intentionally vulnerable)
• CTF game challenges
• Older/unsupported games

Data Source

Important: This skill provides conceptual guidance and overview information. For detailed information use the following sources:

1. Project Overview & Resource Index

Fetch the main README for the full curated list of repositories, tools, and descriptions:

https://raw.githubusercontent.com/gmh5225/awesome-game-security/refs/heads/main/README.md

The main README contains thousands of curated links organized by category. When users ask for specific tools, projects, or implementations, retrieve and reference the appropriate sections from this source.

2. Repository Code Details (Archive)

For detailed repository information (file structure, source code, implementation details), the project maintains a local archive. If a repository has been archived, always prefer fetching from the archive over cloning or browsing GitHub directly.

Archive URL format:

https://raw.githubusercontent.com/gmh5225/awesome-game-security/refs/heads/main/archive/{owner}/{repo}.txt

Examples:

https://raw.githubusercontent.com/gmh5225/awesome-game-security/refs/heads/main/archive/ufrisk/pcileech.txt
https://raw.githubusercontent.com/gmh5225/awesome-game-security/refs/heads/main/archive/000-aki-000/GameDebugMenu.txt

How to use:

1. Identify the GitHub repository the user is asking about (owner and repo name from the URL).
2. Construct the archive URL: replace {owner} with the GitHub username/org and {repo} with the repository name (no .git suffix).
3. Fetch the archive file — it contains a full code snapshot with file trees and source code generated by code2prompt.
4. If the fetch returns a 404, the repository has not been archived yet; fall back to the README or direct GitHub browsing.

3. Repository Descriptions

For a concise English summary of what a repository does, the project maintains auto-generated description files.

Description URL format:

https://raw.githubusercontent.com/gmh5225/awesome-game-security/refs/heads/main/description/{owner}/{repo}/description_en.txt

Examples:

https://raw.githubusercontent.com/gmh5225/awesome-game-security/refs/heads/main/description/00christian00/UnityDecompiled/description_en.txt
https://raw.githubusercontent.com/gmh5225/awesome-game-security/refs/heads/main/description/ufrisk/pcileech/description_en.txt

How to use:

1. Identify the GitHub repository the user is asking about (owner and repo name from the URL).
2. Construct the description URL: replace {owner} with the GitHub username/org and {repo} with the repository name.
3. Fetch the description file — it contains a short, human-readable summary of the repository's purpose and contents.
4. If the fetch returns a 404, the description has not been generated yet; fall back to the README entry or the archive.

Priority order when answering questions about a specific repository:

1. Description (quick summary) — fetch first for concise context
2. Archive (full code snapshot) — fetch when deeper implementation details are needed
3. README entry — fallback when neither description nor archive is available

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