alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Driveby Download Secondary Request 4"; flow:established,to_server; content:"main.php?page="; http_uri; pcre:"/[a-f0-9]{16}$/U"; classtype:trojan-activity; sid:2013651; rev:2; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2011_09_13, deployment Perimeter, signature_severity Major, tag DriveBy, updated_at 2019_07_26;)