ET MALWARE Antinum HTTP Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Antinum HTTP Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/send"; bsize:5;
    http.user_agent;
    content:"Go-http-client/1.1"; bsize:18;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|User-Agent|0d 0a|Content-Length|0d 0a|X-Session-Token|0d 0a|Accept-Encoding|0d 0a 0d 0a|"; bsize:72;
    http.request_body;
    content:"|22|clientid|22|";
    content:"|22|packetid|22|";
    content:"|22|packetType|22|"; fast_pattern;
    content:"downstreamId";
    threshold:type limit, count 1, seconds 300, track by_src;
    reference:url,github.com/dobin/antnium;
    classtype:trojan-activity;
    sid:2043013; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_12_27, deployment Perimeter, deployment SSLDecrypt, malware_family Antinum, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_27;
    target:src_ip;
)