full-disclosure - Trojan found on Linux server

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Message-ID: <43B99D7D.9040409@asbak.coding-slaves.com>
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