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So I have managed to retrieve the assembly_csharp.dll using the il2cpp tool from an android apk, however my issue is that when I go to read the dll using dnSpy I have all the correct looking function names, but the body of all the functions reads like:

return null; 
return default(bool); 
return 0;

etc etc

My question is is there any way to retrieve these functions, or otherwise how can I modify this code to change the app's behaviour

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    You can't. As long as the developer use il2cpp you won't be able to retrieve source code using dnSpy. You need to reverse the native code stored in .so files. – morsisko Dec 29 '20 at 3:00
  • The method bodies you got are empty because they are just place-holder for the real implementation in native code as morsisko already pointed out. They exists just to be able to e.g. query the method interface (parameter- and return type) at run-time. – Robert Dec 29 '20 at 13:15
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Try using IDA Pro to view the ARM code in libil2cpp.so

I watched this video -> https://youtu.be/Vm1Eq0ICCJg?t=567

Download the software -> https://androidrepublic.org/threads/how-to-mod-il2cpp-games.73533/

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  • You must try to avoid to have answer that are only link-based... Try to explain a bit and have the link only to reinforce your explanation. – perror Feb 14 at 9:13

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