alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan.BlackRev Registration Rev3"; flow:established,to_server; http.uri; content:"/gate.php?id="; pcre:"/^[a-z]{15}$/R"; http.header_names; content:!"Referer|0d 0a|"; http.user_agent; content:"(compatible|3b| Synapse)"; reference:url,ddos.arbornetworks.com/2013/05/the-revolution-will-be-written-in-delphi/; classtype:trojan-activity; sid:2016909; rev:4; metadata:created_at 2013_05_22, signature_severity Major, updated_at 2020_04_24;)