full-disclosure - Trojan found on Linux server

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Message-ID: <43B99BA0.9020001@linuxwiz.net>
Date: Mon Jan  2 21:31:40 2006
From: jeremy at linuxwiz.net (Gaddis, Jeremy L.)
Subject: Trojan found on Linux server

After having a customer report that he had large amounts of outbound 
traffic from one of his Linux servers, I began to investigate and found 
a trojan.

The trojan had created a crontab for the "nobody" user (Apache was 
running as nobody and, while I did not take the time to verify I believe 
that Apache was probably the way the intruder got in) which, at 24 
minutes after the hour, would write itself out to /tmp/ummtodkhk and 
then execute itself.

The /tmp/ummtodkhk file was packed with UPX.  It has been unpacked and 
made available at http://www.jeremygaddis.com/files/ummtodkhk.  It was 
submitted to VirusTotal, but nothing identified as anything known.

The results of `crontab -l -u nobody >> nobody.cron` are available at 
http://www.jeremygaddis.com/files/nobody.cron.

-j

--
Jeremy L. Gaddis, GCWN, Linux+, Network+
LinuxWiz Consulting
http://www.linuxwiz.net/