[Snort-sigs] Sype Excersise

James Lay jlay at ...3266...
Thu May 16 18:27:02 EDT 2013

So this is more of an exercise...:

alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"POLICY 
Leaked link via Skype pingback"; flow:to_server,established; 
content:"HEAD"; http_method; content:"User-Agent|3A| -"; http_header; 
content:"Referer|3A| -"; http_header; 
classtype:bad-unknown; sid:10000061; rev:1)

 From the FD post:
They have referrer and user agent set to a dash "-".

Not that I'll actually run this, but just thoughts on if there would be 
a better way to write this up.  Thanks all.


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