LunaHook-mirror/LunaHook/engine32/Overflow.cpp

#include"Overflow.h"

bool InsertSekaiProject1Hook() 
{
  
  /*
  * Sample games:
  * https://vndb.org/v1193
  */
  const BYTE bytes[] = {
    0xCC,                    // int 3 
    0x83, 0xEC, 0x10,        // sub esp,10    << hook here
    0x8B, 0x44, 0x24, 0x14,  // mov eax,[esp+14]
    0x53,                    // push ebx
    0x56,                    // push esi
    0x50,                    // push eax
    0x8B, 0xD9               // mov ebx,ecx
  };

  ULONG range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
  ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStartAddress + range);
  if (!addr) {
    ConsoleOutput("SekaiProject1: pattern not found");
    return false;
  }

  HookParam hp;
  hp.address = addr + 1;
  hp.offset=get_stack(1);
  hp.type = CODEC_UTF16 | USING_STRING | NO_CONTEXT;
  ConsoleOutput("INSERT SekaiProject1");
  return NewHook(hp, "SekaiProject1");
}

bool InsertSekaiProject2Hook() 
{
  
  /*
  * Sample games:
  * https://vndb.org/r21174
  */
  const BYTE bytes[] = {
    0xC7, 0x45, 0xDC, 0x00, 0x00, 0x00, 0x00,   // mov [ebp-24],00000000        << hook here
    0xEB, 0x09,                                 // jmp "SCHOOLDAYS HQ.exe"+4C821
    0x8B, 0x45, 0xDC,                           // mov eax,[ebp-24]
    0x83, 0xC0, 0x01,                           // add eax,01
    0x89, 0x45, 0xDC                            // mov [ebp-24],eax
  };

  ULONG range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
  ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStartAddress + range);
  if (!addr) {
    ConsoleOutput("SekaiProject2: pattern not found");
    return false;
  }

  HookParam hp;
  hp.address = addr;
  hp.offset=get_stack(21);
  hp.type = CODEC_UTF16 | USING_STRING | NO_CONTEXT;
  ConsoleOutput("INSERT SekaiProject2");
  return NewHook(hp, "SekaiProject2");
}

bool InsertSekaiProject3Hook() 
{
  
  /*
  * Sample games:
  * https://vndb.org/r39989
  */
  const BYTE bytes[] = {
    0xCC,                    // int 3 
    0x8B, 0x44, 0x24, 0x04,  // mov eax,[esp+04]     << hook here
    0x83, 0xEC, 0x14,        // sub esp,14
    0x55,                    // push ebp
    0x56,                    // push esi
    0x57,                    // push edi
    0x8B, 0xF9               // mov edi,ecx
  };

  ULONG range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
  ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStartAddress + range);
  if (!addr) {
    ConsoleOutput("SekaiProject3: pattern not found");
    return false;
  }

  HookParam hp;
  hp.address = addr + 1;
  hp.offset=get_stack(1);
  hp.type = CODEC_UTF16 | USING_STRING | NO_CONTEXT;
  ConsoleOutput("INSERT SekaiProject3");
  return NewHook(hp, "SekaiProject3");
}

bool Overflow::attach_function()
{ return InsertSekaiProject1Hook() || InsertSekaiProject2Hook() || InsertSekaiProject3Hook();}