ET MALWARE TA450 CnC Victim Checkin - Authentication Request (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE TA450 CnC Victim Checkin - Authentication Request (POST)";
    flow:established,to_server;
    flowbits:set,ET.TA450.Auth;
    urilen:5;
    http.method;
    content:"POST";
    http.uri;
    content:"/auth";
    http.header_names;
    content:"|0d 0a|x-session|0d 0a|"; nocase;
    http.request_body;
    content:"|7b|"; startswith;
    content:"|22|fqdn|22 3a|";
    content:"|22|hardwareId|22 3a|"; distance:0; fast_pattern;
    content:"|22|admin|22 3a|"; distance:0;
    pcre:"/^.(?:true|false)\x2c[\r\n]/Ri";
    content:"|22|sleepTime|22 3a|"; distance:0;
    reference:md5,64e7e2d2e037d21e8564de52061a31c7;
    classtype:command-and-control;
    sid:2064089; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_08_21, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Critical, tag c2, tag TA450, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)