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311 posts

Ultimate Geek

#57196 5-Feb-2010 14:25
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I have a server that has been hacked and it's running a perl irc bot.
I know the PID but ps gives a forged program name and top shows only perl.
I tried running ps to show child/parent relationships but that program shows no parent.

lsoff shows only dependend libraries that perl opened, netstat -antlp shows the forged program name.
/proc/$PID shows only perl and nothing relevant.

Any ideas on how to find it? I searched for all possible queries on google but I'm running out of ideas.

clamav doesn't detect anything.


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897 posts

Ultimate Geek


  #296454 5-Feb-2010 16:36
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You wont be able to rely on anything (possibly even the kernel itself).

My own response would be to power the server down, fresh install on a separate drive then mount the original drive elsewhere and go from there. Other-ways involve using a live CD to do similar.

Basically you need to treat all your binary programs as untrustworthy "ps" itself is probably modified to hide the processes so first step would be to re-install it from a trust worthy source e.g. in debian procps is the package that contains "ps" so I would re-install that. Once you get your "core" utilities from a reliable source, run a root kit detection utility like rkhunter, chkrootkit and let that scan your system and take care of any nasties you find.

Personally I wouldn't trust any system without a fresh install once I think it may have been compromised.

311 posts

Ultimate Geek

  #296455 5-Feb-2010 16:44
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I am aware of that, however, I believe that the program name was changed by simply modifying the argv[0] on the perl script.

It's very similar to this: http://www.hackinglinuxexposed...

However, my lsof lists only:

# lsof -p 22508
perl 22508 root cwd DIR 104,2 4096 2 /
perl 22508 root rtd DIR 104,2 4096 2 /
perl 22508 root txt REG 104,2 1061668 1494423 /usr/bin/perl
perl 22508 root mem REG 0,0 0 [heap] (stat: No such file or directory)
perl 22508 root mem REG 104,2 67364 5423190 /lib/tls/i686/cmov/
perl 22508 root mem REG 104,2 17840 5423183 /lib/tls/i686/cmov/
perl 22508 root mem REG 104,2 38372 5423184 /lib/tls/i686/cmov/
perl 22508 root mem REG 104,2 19764 1511474 /usr/lib/perl/5.8.8/auto/Socket/
perl 22508 root mem REG 104,2 21868 5423175 /lib/tls/i686/cmov/
perl 22508 root mem REG 104,2 1241392 5423172 /lib/tls/i686/cmov/
perl 22508 root mem REG 104,2 89370 5423189 /lib/tls/i686/cmov/
perl 22508 root mem REG 104,2 145136 5423177 /lib/tls/i686/cmov/
perl 22508 root mem REG 104,2 9592 5423176 /lib/tls/i686/cmov/
perl 22508 root mem REG 104,2 15640 1511482 /usr/lib/perl/5.8.8/auto/IO/
perl 22508 root mem REG 104,2 88164 5406841 /lib/
perl 22508 root 0u CHR 136,0 2 /dev/pts/0 (deleted)
perl 22508 root 1u CHR 136,0 2 /dev/pts/0 (deleted)
perl 22508 root 2u CHR 136,0 2 /dev/pts/0 (deleted)

Also, in /proc/$PID/fd there are only 3 /dev/pts blocks, so nothing relevant.

It's not my server, I'm just trying to help somebody that wants more information before restoring the OS.

So, if we leave the "hacking" thing aside, let's say you have a perl script that changes it's name with argv[0].

How do you track it down? Assuming the system is legit and clean.

$ perl -e '$0 = "Fake command line"; system "ps -f $$"'
arioch 24403 24126 0 09:59 tty4 S 0:00 Fake command line


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