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Date: Mon Jan 2 21:39:20 2006 From: niek at asbak.coding-slaves.com (Niek) Subject: Trojan found on Linux server On 1/2/2006 10:31 PM +0200, Gaddis, Jeremy L. wrote: > 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 Hi Jeremy, This is a much seen thing these days. Your customer probably got attacked by an insecure php script (cacti/xmlphp/awstats/ect). Check your apache logs. if I grep my logs for wget, I see tons of attempts. The trojan is a an irc drone, listinging for ddos commands/ect. Regards, Niek
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