generate-venetian-nops.py

#!/usr/bin/env python3

import subprocess
import sys

for i in range(0x00, 0xff+1):
    opcodes = '00' + str(hex(i)).replace('0x', '').rjust(2, '0') + '00'

    cmd = ['rasm2', '-a', 'x86', '-b', '32', '-d', opcodes]

    try:
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
        output = p.stdout.readlines()
        if b'invalid\n' in output:
            continue
        else:
            print('[+] {} -> {}'.format(opcodes, b''.join(output).decode().strip()))
    except Exception as e:
        print('[-] Failed to invoke rasm2: {}'.format(e))
        sys.exit(1)