From: Matt Kettler (mkettlerevi-inc.com)
Date: Mon Jan 05 2004 - 17:58:42 CST

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At 06:31 PM 1/5/2004, Ben Carter wrote:
>I love SNORT! I have been searching for a way to use SNORT to detect
>subnet scans, but am unable to find what I am looking for in the FAQ,
>Documentation or mailing list archives. I see that there is a
>pre-processor module that has the ability to look beyond simple packet
>matching rules, but it appears that this pre-processor module only detects
>port scans. Is there a pre-processor module to detect when a host scans
>for multiple /hosts/? Optimally the source host would be identified by MAC
>address rather than IP so that scans or attacks launched from a single
>station which was spoofing multiple source IP addresses (such as one of
>those nasty worms) could be identified.

The old-fashioned spp_portscan can do multiple hosts OR multiple ports.

Note: do not confuse spp-portscan with spp-portscan2 or the flow-portscan
tools. All three are different beasties.

I'm not sure, but I suspect flow-portscan will also detect subnet scans,
not just portscans of a single box.

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