alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ransomware Win32/WinPlock.A Successfully Installed CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"M STATE|3a 20|INSTALL|0d 0a|"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,b8a1012e3afc6eabb7819ce4d8e2b93b; classtype:command-and-control; sid:2021853; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_09_30, deployment Perimeter, malware_family Win32_WinPlock_A, signature_severity Major, tag c2, updated_at 2020_06_02, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)