> My server has been seeing some usual activities today, I don't have much ti=
> me
> to get down to the bottom of things, but after I investigated briefly I have
> decided to disable PERL executable permission for www-data (Apache process's
> user), also locked /var/tmp so www-data cannot write to it.=20

> I found a bunch of processes called ./atac 20 running, and found the
> following content in /tmp/atac:

Running 'strings' on atac reveals that it does an ssh brute force login
attack on remote systems. Interesting enough, our security logs last
night showed such an attempt against some of our clients systems, with
EXACTLY the same sequence of trial user names! So you have a copy of
the tool that was being used against them.

Skip

--
Dr. Everett (Skip) Carter Phone: 831-641-0645 FAX: 831-641-0647
Taygeta Network Security Services email: skip (at) taygeta (dot) net [email concealed]
1340 Munras Ave., Suite 314 WWW: http://www.taygeta.net/
Monterey, CA. 93940

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