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Network Security Snort-Signatures
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[Snort-sigs] ARP "Who has (one address)" > "Tell (many different, random

from [Les Yaw] Network Security [Permanent Link]
Subject: [Snort-sigs] ARP "Who has (one address)" > "Tell (many different, random IP's)"
Date: Thu, 28 Oct 2004 08:09:32 -0500
We're a "residential college" with over 2,700 college students with their own computers on our "ResNet." We seem to be under attack from within. My Senior Sys Admin looked on the firewall's tcpdump activity shows massive quantities of ARP traffic, which ask "Who has (one single internal IP address)" with a destination of "Tell (multiple, random internal IP addresses)."

We're with the belief this is the activity of a slew of zombie computers on our network.

Has anyone ever seen such activity?
Can you tell us what the name of this trojan/worm/viruii is?
How can we detect this?

Thank you in advance,

Newbie

Les Yaw
Luther College
Decorah, IA




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