IPS Signatures

TCP SYN FIN Host Sweep

 
Signature ID: 3036/0
Original Release:S2
Release:S2 (download)
Original Release Date:2001 February 02
Latest Release Date:2001 February 02
Default Enabled:True
Default Retired:False
Alarm Severity:High
Fidelity:100 

Description

Triggers when a series of TCP packets with both the SYN and FIN flags set have been sent to the same destination port on a number of different hosts. This could, for example, be a sweep of many hosts to find out which ones can receive mail or telnet sessions. This is indicative that a reconnaissance sweep of your network may be in progress. The use of both the SYN and FIN flag is abnormal, and could indicate an attempt to conceal the sweep.

Recommended Filter

No recommended filters.

Benign Triggers

No known triggers.

Download

To download this and other IPS update files, please go to Cisco Secure Software Download.

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