alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Redkit URI Struct Flowbit"; flow:established,to_server; content:".htm"; http_uri; fast_pattern:only; pcre:"/^\/[a-z]{4}\.html?(\?[h-j]=\d+)?$/U"; flowbits:set,ET.http.driveby.redkit.uri; flowbits:noalert; classtype:exploit-kit; sid:2016589; rev:8; metadata:created_at 2013_03_19, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)