My wife's office server was compromised today. It appears they ssh'ed in through account pcguest which was set up for Samba. (I don't remember setting up that account, but maybe I did.) At any rate, I found a bazillion "ftp_scanner" processes running. A killall finished them off quickly, I nuked the pcguest account, and switched ssh to a different port (which I normally do anyway).
I used 'find' to locate ftp_scanner, which was running in a folder under /var/tmp. It seems that before I could nuke the directory, it nuked itself!
Because it was running from /var/tmp, and because 'find' and 'ps' were not compromised (in that they did not hide the ftp_scanner processes or files), I'm thinking the attacker really didn't get any further than eating some bandwidth.
I suppose I have no choice but to re-install, but I thought I'd run I'd get some feedback first. (Something other than, "Way to go, moron.") In the meantime, I'm pulling the plug.
Miark