alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET DELETED Worm.Win32.Koobface.C User-Agent"; flow:established,to_server; content:"|0d 0a|User-Agent|3a| Mozilla/5.01"; content:"Gecko/2005"; fast_pattern; within:50; content:"Firefox/3"; distance:5; classtype:trojan-activity; sid:2008848; rev:7; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)