Re: [Snort-users] ru.le to detect lots of syn pkts?

At 10:12 AM 6/4/2004, Rich Adamson wrote:
> The problem was one customer was infected with a
>virus that caused their machine to attempt 1,000's of connections with
>various Internet boxes.
>
>Is there a way to write a general rule that would alert when any -> any
>attempts more then xx connections per unit of time on any port?

the classic portscan preprocessor set with rather high thresholds should be
useful in picking up blaster, sasser, and similar high-voulme of
connections generated by worm infections.

While it's not very good at detecting real-world portscans without false
alarms, it's very good at detecting truly massive scans like a worm causes.
Set it to something on the order of 500 connections in 5 seconds.




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