RE: Logon.dll? Possible root-kit?

["Amarante, Rodrigo P." <RPAmarante () directvla com>]

Logon.dll is normally a protocol parser for the R_Logon (Generated RPC
for interface logon) protocol. It's normally installed along with the
Windows Network Monitor. It's normally located in
winnt\system32\netmon\parsers and is made by microsoft. So, by being in
winnt\system32 and not from MS, might indicate that a 3rd party network
monitor has been installed...
Also, the reason why inetsrv doesn't show up it's because IIS actually
runs as inetinfo.exe
On the bot itself, I have not seen it before.
Did your client give a reason for not reinstalling everything? It seems
obvious to me that if a IRC bot is running on your machine, the system
has been compromised (even if by a rogue admin)...

-----Original Message-----
From: Nick Jacobsen [mailto:nick () ethicsdesign com] 
Sent: Wednesday, April 02, 2003 9:10 PM
To: incidents () securityfocus 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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