lorekin / genshin-bypass

An Anti-Cheat Bypass for Genshin Impact that allows you to inject any dlls into the protected game.

Genshin-Bypass

An Anti-Cheat Bypass for Genshin Impact that allows you to inject ANY dlls into the protected game.

Overview

The Genshin installs KernelMode Driver named "mhyprot2" to protect its process under a privileage of Windows Kernel.
So there is nothing we can do from the user-mode usually, except abusing exploits.

In this project, I choose libelevate which provides handle elevation for ANY processes, using libcapcom.
Also the libcapcom provides code execution on kernel which makes us advantage in this fight, against kernel-level protections.

Because mhyprot2 hides its process handle by ObRegisterCallbacks.
After the work finishes, the driver will be unloaded.

Analysis

Some functionalities were being packed.
Also there are a lots of global variables.
Felt a bad code.

What "mhyprot2" registers:

• PsSetCreateProcessNotifyRoutineEx
• PsSetLoadImageNotifyRoutine
• PsSetCreateThreadNotifyRoutine

What "mhyprot2" does:

• Observing for csrss.exe injection.
• Remove process/thread object from all handle tables.
• Write logs into c:\windows\kmlog.log

We can confirm that the driver removes handle from all of tables, as follows:
(hardcoded codes are omitted)

bool __fastcall RemoveHandleFromHandleTable(__int64 a1, __int64 a2, __int64 a3)
{
  char rtlOsVersionInfo; // [rsp+20h] [rbp-128h]
  unsigned int v5; // [rsp+2Ch] [rbp-11Ch]
  __int64 pEProcess; // [rsp+150h] [rbp+8h]

  switch ( dword_14000A748 )
  {
    case 61:                                    // Windows 7
      break;
    case 62:                                    // Windows 8
      goto LABEL_15;
    case 63:                                    // Windows 8.1
LABEL_15:
      break;
    case 100:                                   // Windows 10
      RtlGetVersion(&rtlOsVersionInfo);
      if ( v5 >= 0x4A61 ) {
LABEL_9:
        break;
      }
      if ( v5 >= 0x47BA ) {
        goto LABEL_9;
      }
      if ( v5 < 0x3AD7 ){}
      else {}
      break;
  }
  pEProcess = 0i64;
  PsLookupProcessByProcessId(4i64, &pEProcess, a3); // pid 4 is system process
  return sub_140003D08(pEProcess) == 4;
}