Logon.dll? Possible root-kit?

["Nick Jacobsen" <nick () ethicsdesign com>]

Hi all, hoping someone can point me in the right direction.
    I usually do penetration testing, but one of my clients had someone,
they suspect a past employee, break into their network.  I didn't get called
in till well after the incident, and they did not have any logs from the
time of the incident.  Now, I have found two extremely odd things...  One, a
file called logon.dll in the winnt\system32 directory, that was NOT made by
microsoft, and two, that inetsrv (internet information services) does not
show up in the process list, though it is running.  BTW, this is a windows
2000 box.  I have advised this client to wipe the box and restore from a
ghost image, but they are not willing to.  I guess my question is for any
possible information on a root kit that could have been used againt this
machine, as well as any tools you know about that may help me detect the
rootkit.
    On a second note, I have discovered an IRC bot installed on this machine
as well.  The file name was r_bot.dll, and it connected to irc.choopa.net,
channel #thallia, chan password "suckme"...  have any of you run into this
specific bot?  if so, what commands does it support?

Anyway, thanks in advance for your help.

Nick Jacobsen
Ethics Design
nick () ethicsdesign com


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