ET MALWARE CryptoShield Ransomware Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE CryptoShield Ransomware Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"id="; depth:3;
    content:"&numbers=-----";
    content:"BEGIN|20|PRIVATE|20|KEY"; fast_pattern;
    http.content_type;
    content:"application/x-www-form-urlencoded"; bsize:33;
    http.header_names;
    content:!"Referer|0d 0a|";
    content:!"User-Agent|0d 0a|";
    content:!"Accept";
    reference:md5,ef815146b802cfd6a5fb67d1f9267745;
    classtype:command-and-control;
    sid:2023814; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_01_31, deployment Perimeter, malware_family Ransomware, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_04, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)