YES! try rkhunter and chkrootkit (both preferred).
you may have been rootkitted.....
On Thursday 22 February 2007 21:15, Jim wrote:
> Last night I came home from work and sat down at the computer. I
> noticed the lights on the DSL router were blinking very rapidly. I have
> an ftp server running on my linux box (Slackware 10.2). So I thought
> someone might have been uploading something.
>
> Ftpwho showed no users logged in. I checked the incoming directory and
> saw nothing there.
>
> Tcpdump showed me that they were sending something using ssh.
>
> I used find to look for anything they might have been uploading, but
> found nothing.
>
> /var/log/syslog contained the following over and over for about 4 hours
> before I got home
>
> Feb 22 20:43:56 ladmo smbd[6375]: [2007/02/22 20:43:56, 0]
> printing/print_cups.c:cups_cache_reload(85)
> Feb 22 20:43:56 ladmo smbd[6375]: Unable to connect to CUPS server
> localhost - Connection refused
>
> Then I found in /var/log/syslog this over and over
>
> Feb 21 22:11:14 ladmo sshd[26255]: error: Could not get shadow
> information for NOUSER
>
> I stopped sshd and edited /etc/sshd_config by adding the following:
> AllowUsers root jim
> AllowGroups root
>
> To test the change, I tried to log into the server via ssh and using
> another account. It wouldn't let me log in using that other account via
> ssh.
>
> I also tried
> find / -mmin 1200 -size +100k
> and without the size option, but found nothing from the time this was
> going on.
>
> After all this I tried to send an email, but sendmail wasn't working. I
> backed up my sendmail config files, uninstalled sendmail, reinstalled it
> and restored the config files. Sendmail worked after that.
>
> Is there anything else I should do?
>
> thanks
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