How It Works - StarGate01/AmongUs-Mumble GitHub Wiki

This is a DLL sideloading/hijacking proxy (proxies winhttp.dll), which hooks the IL2CPP functions in memory (using the Microsoft Detours library) and exposes the game state to Mumble via shared memory. Originally, I tried a memory-scanning approach (akin to https://github.com/shlifedev/AmongUsMemory/), but this proved to be way to slow. In addition, Mumble is instrumented using RPC commands (for muting and unmuting).

Your anti-virus might flag this as malware, because some of these methods are also sometimes used by malware. If you dont trust me, read and compile the code for yourself.