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Network Security Snort-Signatures
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[Snort-sigs] FP for sid 2000538

Subject: [Snort-sigs] FP for sid 2000538
Date: Wed, 23 Nov 2005 09:52:29 +0100

I have a lot of false positives with the rule that detect Nmap scan.
It come frequently from web sites

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg: "BLEEDING-EDGE SCAN NMAP 
-sA (1)"; fragbits: !D; dsize: 0; flags: A,
12; window: 1024; reference: arachnids,162; classtype: attempted-recon; sid: 
2000538; rev:3; ):

Sample  (xxx.xxx.xxx.xxx is a web site , and  yyy.yyy.yyy.yyy is a local 
host) :
16:51:08.196181 IP xxx.xxx.xxx.xxx.80 > yyy.yyy.yyy.yyy.46490: . ack 
1899022551 win 1024 <mss 536>



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