ET MALWARE Ransomware Win32/WinPlock.A Successfully Installed CnC Beacon

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;
)