alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan.BlackRev Botnet Monitor Request CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/monitor.php?resp=ID|3a|"; fast_pattern; content:"Target|3a|"; content:"Message|3a|"; pcre:"/\/monitor\.php\?resp=ID\x3a[A-Za-z]{15}/"; http.user_agent; content:"Mozilla/4.0 (SEObot)"; depth:20; http.header_names; content:!"Referer|0d 0a|"; reference:url,www.btpro.net/blog/2013/05/black-revolution-botnet-trojan/; classtype:command-and-control; sid:2017717; rev:5; metadata:attack_target Client_Endpoint, created_at 2013_11_15, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)