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Open Source and information security mailing list archives
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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/
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