Re: [Snort-users] Best detection of Worm

We've been using the Bleedingsnort Rxbot specific rules with great success.

I wouldn't trust using DNS specific rules -- the variants of Rxbot I've
seen use a variety of DNS servers. There are some Bleedingsnort rules to
watch for the "infected" reports to the botnet DNS server.

Because Rbot also attempts to infect other machines, watching for the
infection attempts with generalized threshold rules is a strategy we use
to track down infected machine. See the recent thread "TCP sweeps" for a
discussion of some of these rules.

Hope that helps, we've been using Snort to track down Rbot for quite a
while.

-Nick

Bristol, Gary L. wrote:
> We seem to be seeing an infection of the WORM_RBOT.TO worm, by
> examination of the DNS logs, we'rd finding DNS lookups for the
> Site (gz.freetypers.us) that the worm then establishes an IRC
> connection too.
>
> What would be the best way to detect on this , an initial on the DNS
> lookup and then a positive on the IRC Connection?
>
> http://www.trendmicro.com/vinfo/viru...BOT.TO&VSect=T
> <http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_RBOT.TO&VSect=T>


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