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Network Security Snort-Signatures
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Re: [Snort-sigs] TCP sweeps

Subject: Re: [Snort-sigs] TCP sweeps
Date: Mon, 13 Dec 2004 10:31:55 -0500
Good to know this idea has some value, thanks.

I'm concerned about 500/minute though. Specifically in the case of a worm infected workstation. I've seen them so loaded by the worm that they can barely get one or two connections initiated a second. I'm concerned we'd miss the underpowered workstation infections. Several of the poorly written recent worms opened so many threads this was the case even on well powered machines.

In practice are you seeing the average machine go well over 500/minute in an infection?

Matt

Hazel, Scott A. wrote:

We have dealt with similar issues here using Dragon. I know the platform is
different but we applied the same approach. I called them spike alerts and
started closer to 500 in 60 seconds. For segments containing MS DC's,
setting it as low as 50 still gave us a high FP rate. Seems like non-DC
segments would be fine at 50/min.


Scott Hazel
Security Operations Center
Unisys
scott.hazel@unisys.com





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