RE: Nachi
- From: "William Robertson" <robertson.william@xxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Mon, 1 Dec 2003 08:44:00 +0200
Hi Ahmed
You need to analyse the Firewall Logs. There are 2 ways of doing it, firstly
I just scan through the logs very quickly and try to look for the same IP
Address that is being repeated at a VERY high frequency. This is a quick
(yet unreliable) way to find the infected workstation.
The best way is to actually install Network Monitor on your Firewall server
and start a trace on the Internal NIC. Let it run for about 5 minutes and
then view the trace. Then enable an ICMP filter to only show the ICMP
traffic and then you will very quickly see which workstation is causing all
the havoc on your network.
By the way, if you are not fast enough to get to all the infected machines,
I suggest that you disable the "Allow Outbound ICMP" packet filter on your
Firewall. This will at least stop all these outbound ICMP's clogging your
internet link.
Cheers
William R.
-----Original Message-----
From: Nabil, Ahmed [mailto:anmahmou@xxxxxxxxxx]
Sent: 30 November 2003 11:46 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Nachi
http://www.ISAserver.org
Which logs should i analuze, there are three different types of logs in the
ISA Logs folder (Web, Firewall....etc) Is it the WEB ??
How Can i know the machine infecting the ISA (having the virus), What is my
criteria ?? Is it the port number ? In most cases the Port is not enough.
Please advice.
Thanks,
Ahmed
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