From: Danny.Andaluz@triaton-na.com
Date: Wed Aug 27 2003 - 14:05:18 GMT-3
Raj,
What do here to identify infected machines, is to turn on ip accounting on
the last internal router's outbound interface facing our firewall. If you
see many entries for one packet from one source and they are the same byte
count and they are sending to many different IP's, that machine is infected.
HTH,
Danny
-----Original Message-----
From: Rajagopal S [mailto:raj_ccie@yahoo.com]
Sent: Wednesday, August 27, 2003 10:30 AM
To: ccielab@groupstudy.com
Subject: NACHI !!!
Hi guys,
Nachi virus stroke my network. My router melted down after the attack.
As such, there are huge no of PC's sitting on the inside interface of the
firewall. the router having the internet link is sitting on the outside
interface of the firewall.
The internal users/servers are connected to the PIX via a 4507 internal L3
switch.
I have identified the traffic coming from inside to outside on port 0800
(icmp type 8 packet) from the patted IP to some arbitarty IPs on internet. I
have blocked icmp on PIX and stabilised the situation.
But I still am not sure, which hosts on the internal network is pushing this
traffic (ie affected with nachi). Am ready to put nachi patches in all the
500 odd machines, but is a bit tough !!!
Is there any way to find the machine pumping this traffic from the switch ?
am not able to enable ip route-cache flow or ip accounting on the vlan
interface nor able to enable MLS. Is there any other way to see this
information?
Cheers
Raj
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