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Il2CppDumper

Modified version of Il2CppDumper allows you to dump methods of UserAssembly.dll of the game Genshin Impact

NOTICE: The global-metadata.dat of the game Genshin Impact has been encrypted, you need to dump decrypted file from memory before use this tool.

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Unity il2cpp reverse engineer

Features

• Complete DLL restore (except code), can be used to extract MonoBehaviour and MonoScript
• Supports ELF, ELF64, Mach-O, PE, NSO and WASM format
• Supports Unity 5.3 - 2020
• Supports generate IDA and Ghidra scripts to help IDA and Ghidra better analyze il2cpp files
• Supports generate structures header file
• Supports Android memory dumped libil2cpp.so file to bypass protection
• Support bypassing simple PE protection

Usage

Run Il2CppDumper.exe and choose the il2cpp executable file and global-metadata.dat file, then enter the information as prompted

The program will then generate all the output files in current working directory

Command-line

Il2CppDumper.exe <executable-file> <global-metadata> <output-directory>

Outputs

DummyDll

Folder, containing all restored dll files

Use dnSpy, ILSpy or other .Net decompiler tools to view

Can be used to extract Unity MonoBehaviour and MonoScript, for UtinyRipper, UABE

ida.py

For IDA

ida_with_struct.py

For IDA, read il2cpp.h file and apply structure information in IDA

il2cpp.h

structure information header file

ghidra.py

For Ghidra

script.json

For ida.py and ghidra.py

stringliteral.json

Contains all stringLiteral information

Configuration

All the configuration options are located in config.json

Available options:

• DumpMethod, DumpField, DumpProperty, DumpAttribute, DumpFieldOffset, DumpMethodOffset, DumpTypeDefIndex

  • Whether to output these information to dump.cs

• GenerateDummyDll, GenerateScript

  • Whether to generate these things

• ForceIl2CppVersion, ForceVersion

  • If ForceIl2CppVersion is true, the program will use the version number specified in ForceVersion to choose parser for il2cpp binaries (does not affect the choice of metadata parser). This may be useful on some older il2cpp version (e.g. the program may need to use v16 parser on il2cpp v20 (Android) binaries in order to work properly)

Common errors

ERROR: Metadata file supplied is not valid metadata file.

Make sure you choose the correct file. Sometimes games may obfuscate this file for content protection purposes and so on. Deobfuscating of such files is beyond the scope of this program, so please DO NOT file an issue regarding to deobfuscating.

If your file is libil2cpp.so and you have a rooted Android phone, you can try my other project Riru-Il2CppDumper, it can bypass this protection.

ERROR: Can't use auto mode to process file, try manual mode.

Please note that the executable file for the PC platform is GameAssembly.dll or *Assembly.dll

You can open a new issue and upload the file, I will try to solve.

ERROR: This file may be protected.

Il2CppDumper detected that the executable file has been protected, use GameGuardian to dump libil2cpp.so from the game memory, then use Il2CppDumper to load and follow the prompts, can bypass most protections.

If you have a rooted Android phone, you can try my other project Riru-Il2CppDumper, it can bypass almost all protections.

Credits

• Jumboperson - Il2CppDumper