Unhooking Themida's anti-debugging feature

bool PatchBack()
{
	HMODULE hModule = GetModuleHandle(TEXT("ntdll.dll"));
	if (!hModule) return false;

	DWORD address = (DWORD)GetProcAddress(hModule, "DbgBreakPoint");
	if (!address) return false;

	DWORD OldProtect;

	if (*(BYTE*)address != 0xCC)// Not an int 3 instruction
	{
		if (!VirtualProtect((LPVOID)address, sizeof(BYTE), PAGE_EXECUTE_READWRITE, &OldProtect)) return false;

		*(BYTE*)address = 0xCC;
		VirtualProtect((LPVOID)address, sizeof(BYTE), OldProtect, &OldProtect);
	}

	address = (DWORD)GetProcAddress(hModule, "DbgUiRemoteBreakin");
	if (!address) return false;

	if (*(BYTE*)address != 0x6A)// Not a push instruction
	{
		const BYTE original[] = { 0x6A, 0x08, 0x68, 0x40, 0xBA, 0x12, 0x77 };

		if (!VirtualProtect((LPVOID)address, sizeof(original), PAGE_EXECUTE_READWRITE, &OldProtect)) return false;

		for (BYTE i = 0; i < sizeof(original); i++) ((BYTE*)address)[i] = original[i];

		VirtualProtect((LPVOID)address, sizeof(original), OldProtect, &OldProtect);
	}

	return true;
}