I found below message from security event log.
Event message could not be found, but contained these strings: administrator, 64.168.127.161, 3, NtLmSsp , NTLM, UDUUCOM
It happened during early morning like 3:00AM and followed by all the users names not just administrator.
It lasted for 2 hours according security event log and I don't see any problem on the server.
We have Cisco 1720 router and using private IP,
Is this hacker attack? and is he hacked our system?
Any suggestions will be appreciated.
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It could be various ways, having nat essentially doesn't mean it is protected. Do you have this ip addresses? as in my previous post? and does it make any sense to you? Let know.
Also, do you have any kind of services published?
Or even from internal to your lan, some spoofing might be happening for ip addresses to hide the track. Can you post one of those logs and paste it here completely?
Cheers,
Rajesh
Point number 1 answers point number 3 - If you're not using that IP then somebody indeed is spoofing.
Point number 2 - Are there are services as in web server/email server that you're opening it to internet.
Now that we know it is spoofing, you need to take extra care of the situation. First check your perimeter firewall logs to see if you see any kind of activity like this.
If not, then it is internal.
Cheers,
Rajesh
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by: rsivanandanPosted on 2008-09-20 at 09:43:43ID: 22530518
Where do you see those messages? Can you explain a little more on "followed by all the users" ?
Cheers,
Rajesh