// pAddress = address where we want to place our hook
// dwJumpTo = address where we want to jump to
// dwLen    = length of the bytes to overwrite

void MakeJMP(BYTE *pAddress, DWORD dwJumpTo, DWORD dwLen)
{
    DWORD dwOldProtect, dwBkup, dwRelAddr;

    // give the paged memory read/write permissions

    VirtualProtect(pAddress, dwLen, PAGE_EXECUTE_READWRITE, &dwOldProtect);

    // calculate the distance between our address and our target location
    // and subtract the 5bytes, which is the size of the jmp
    // (0xE9 0xAA 0xBB 0xCC 0xDD) = 5 bytes

    dwRelAddr = (DWORD) (dwJumpTo - (DWORD) pAddress) - 5;

    // overwrite the byte at pAddress with the jmp opcode (0xE9)

    *pAddress = 0xE9;

    // overwrite the next 4 bytes (which is the size of a DWORD)
    // with the dwRelAddr

    *((DWORD *)(pAddress + 0x1)) = dwRelAddr;

    // overwrite the remaining bytes with the NOP opcode (0x90)
    // NOP opcode = No OPeration

    for(DWORD x = 0x5; x < dwLen; x++) *(pAddress + x) = 0x90;

    // restore the paged memory permissions saved in dwOldProtect

    VirtualProtect(pAddress, dwLen, dwOldProtect, &dwBkup);

    return;

}