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Unity

Introduction

Unity is one of the most frequently used game engines in CTF reverse engineering challenges. Flags or credentials often appear in embedded scripts, asset bundles, or metadata resources.

Quick Reference

  • Managed (Mono): Assembly-CSharp.dll
  • IL2CPP games: use IL2CPP Dumper or Cpp2IL
  • Decompile assemblies: ILSpy, dnSpyEx, or JADX
  • Extract assets: AssetRipper, UABE

Tools

Tool Purpose
IL2CPP Dumper Extracts symbols and metadata from IL2CPP binaries
Cpp2IL Recreates readable C# from compiled C++ code
AssetRipper Extracts Unity assets/resources from projects or builds
Unity Assets Bundle Extractor Legacy asset editor for Unity bundles
MelonLoader Loads plugins for runtime inspection
BepInEx Plugin injector and modding framework
UnityExplorer Runtime object explorer for managed Unity assemblies

Tips

  • Mono games are easily decompiled — check Managed/Assembly-CSharp.dll.
  • IL2CPP games separate metadata (global-metadata.dat) and binary logic (GameAssembly.dll).
  • Extraction tools can reveal text assets or JSON configs containing hints for flag validation.
  • Plugin loaders like BepInEx or MelonLoader allow executing your own C# scripts inside the running game.