ET MALWARE Antinum WebSockets Start

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Antinum WebSockets Start";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/ws"; bsize:3;
    http.user_agent;
    content:"Go-http-client/1.1"; bsize:18;
    http.connection;
    content:"Upgrade"; bsize:7;
    http.header;
    content:"Upgrade|3a 20|websocket|0d 0a|"; endswith;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|User-Agent|0d 0a|Connection|0d 0a|Sec-WebSocket-Key|0d 0a|Sec-WebSocket-Version|0d 0a|Upgrade|0d 0a 0d 0a|"; bsize:85; fast_pattern;
    reference:url,github.com/dobin/antnium;
    classtype:command-and-control;
    sid:2043012; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_12_27, deployment Perimeter, deployment SSLDecrypt, malware_family Antinum, confidence Low, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_27;
)