[Snort-sigs] DDOS Shaft Client Rule and False Postives

Mark markmormartin at ...1934...
Wed May 26 07:11:03 EDT 2004

I saw last week there was some discussions in relation to false
positives on this rule

alert tcp $EXTERNAL_NET any -> $HOME_NET 20432 (msg:"DDOS shaft client
to handler"; flow:established; reference:arachnids,254;
classtype:attempted-dos; sid:230; rev:2;)

would this rule not be better written by instead of using established to
use the to_server keyword, or would it be better to modify it to be like
the SCAN Proxy rule but modify it to look for syn packets on port 20432


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