alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan.BlackRev Registering Client"; flow:established,to_server; http.uri; content:"/gate.php?reg="; fast_pattern; pcre:"/\/gate\.php\?reg=(?:[a-z]{10}|[A-Za-z]{15})$/"; http.header_names; content:!"Referer|0d 0a|"; reference:url,ddos.arbornetworks.com/2013/05/the-revolution-will-be-written-in-delphi/; classtype:trojan-activity; sid:2016899; rev:6; metadata:created_at 2013_05_21, signature_severity Major, updated_at 2020_09_18;)