Yeah pull the network plug first. Then boot up with a knoppix CD to
backup your data and/or image the disk, then reload. I'm sure you could
do a full audit of the system but reloading is likely much quicker.
A word to the wise on the account pcguest, if it was one you created,
set the shell to something like /sbin/nologin. That can help to prevent
unauthorized ssh access if you happen to leave a password blank. I'll
leave the additional suggestions and heckles to others on the lists.
Miark wrote:
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
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