alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Incognito Exploit Kit Checkin"; flow:established,to_server; flowbits:set,et.exploitkitlanding; http.uri; content:".php|3F|a|3D|QQk"; reference:url,blog.fireeye.com/research/2011/03/the-rise-of-incognito.html; classtype:exploit-kit; sid:2012841; rev:6; metadata:created_at 2011_05_25, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_20;)