Use a dedicated script like frida-il2cpp-bridge or standard memory dumpers designed for Unity.
Evaluate header alignment structure and fix corrupt magic bytes manually.
This memory dump approach is also crucial for dealing with cases where the file's header signatures are intentionally destroyed. For example, a standard global-metadata.dat file starts with the magic bytes AF 1B B1 FA . An attacker might change these to 00 00 00 00 to break header-based detection. By dumping the file from memory, you get the corrected, decrypted version, which you can then fix by simply replacing the first four bytes with the standard signature. decrypt globalmetadatadat
Check the first 4 bytes. If they aren't AF 1B B1 FA , the tool will fail.
Some games use known, standardized encryption methods (like XOR) that specialized inspectors can handle automatically. Il2CppInspector global-metadata.dat and the binary file ( libil2cpp.so GameAssembly.dll ) into the tool. Check for existing loader plugins or built-in support for games like Genshin Impact Call of Duty: Mobile Use a dedicated script like frida-il2cpp-bridge or standard
However, developers often choose to encrypt this file to prevent hackers or modders from easily analyzing their game. is the first step toward extracting game data, modifying strings, or understanding game logic. What is global-metadata.dat ?
: Experts use disassemblers like IDA Pro or Ghidra to find the specific C++ function responsible for loading the metadata. They then reverse-engineer the math to write a standalone decryptor. Specialised Tools : For example, a standard global-metadata
In a standard Unity game, the logic is stored in a Assembly-CSharp.dll file. This is easy to decompile. However, to increase performance and security, many developers use . When a game is compiled with IL2CPP: The C# code is converted into C++ code.
| Tool | Purpose | Key Feature | | :--- | :--- | :--- | | | Dynamic instrumentation and memory dumping | Hook into running apps to intercept function calls and read memory | | IDA Pro / Ghidra | Static binary analysis | Disassemble native libraries to find decryption logic | | IL2cppDumper | Metadata parser | Converts a decrypted global-metadata.dat and libil2cpp.so into readable C# code and JSON files, the primary goal for many reverse engineers | | Metadata-Decryptor | Heuristic metadata extraction | Extracts and reconstructs metadata directly from libunity.so without runtime dumping | | Il2CppInspector | Cross-platform metadata viewer | A powerful GUI tool for browsing and analyzing decrypted IL2CPP metadata, offering a more visual approach |
Decrypting global-metadata.dat is a crucial step in reverse-engineering IL2CPP-based Unity games, as the file contains class, method, and string information essential for analysis. While developers often encrypt or obfuscate this metadata to prevent tampering, it can be recovered via memory dumping, static analysis of libil2cpp.so
If you have ever tried to mod, data-mine, or reverse-engineer a modern mobile or PC game, you have likely encountered a file named global-metadata.dat . This file is the holy grail for extracting game logic, variable names, and structure from games built using the Unity engine.