alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Operation Buhtrap CnC Beacon 1"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/gate.php"; fast_pattern; pcre:"/\/gate\.php$/"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|Synapse)"; depth:33; http.request_body; content:"id="; depth:3; pcre:"/^[A-F0-9]+$/R"; reference:url,welivesecurity.com/2015/04/09/operation-buhtrap/; reference:md5,24fac66b3a6d55a83e1309bc530b032e; classtype:command-and-control; sid:2020890; rev:5; metadata:attack_target Client_Endpoint, created_at 2015_04_11, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_30, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)