Strange Logon Process: Ðùº... comments?



Hello Everyone!

I am getting failed logons in my exchange 2000 server running on
Win2k3. All latest SP applied. The event is as follows:

<<<<
Event Type: Failure Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 537
Date: 7/10/2006
Time: 3:21:07 PM
User: NT AUTHORITY\SYSTEM
Computer: MAIL
Description:
Logon Failure:
Reason: An error occurred during logon
User Name:
Domain:
Logon Type: 3
Logon Process: Ðùº
Authentication Package: NTLM
Workstation Name:
Status code: 0x80090308
Substatus code: 0x0
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: 192.168.100.10
Source Port: 40687


For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.


The IP 192.168.100.10 is an ISA 2004 server... no service pack.

Any ideas on whe the logon process is "Ðùº"??? I can't find any
strange processes or any strange services. I will run a rootkit
revealer, but I would love some comments on this!

Thanks!

Agustin.

.



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