ET MALWARE CHAOS RAT/AlfaC2 Client Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE CHAOS RAT/AlfaC2 Client Checkin";
    flow:established,to_server;
    http.uri; bsize:7;
    content:"/client";
    http.user_agent;
    content:"Go-http-client/"; startswith;
    http.header_names;
    content:"|0d 0a|X-Client|0d 0a|"; fast_pattern;
    http.header;
    content:"Upgrade|3a 20|websocket|0d 0a|";
    content:"X-Client|3a 20|";
    pcre:"/^(?:[a-f0-9]{2}\x3a){5}[a-f0-9]{2}[\r\n]+$/Rm";
    http.cookie;
    content:"jwt="; startswith;
    content:".eyJhdXRob3JpemVkIj"; distance:0;
    content:!"|3b|"; distance:0;
    reference:md5,d0ea84204096109f18a2201fae1c4f30;
    reference:url,github.com/tiagorlampert/CHAOS;
    classtype:command-and-control;
    sid:2046872; rev:1;
    metadata:attack_target Client_and_Server, created_at 2023_07_20, deployment Perimeter, malware_family CHAOS, performance_impact Low, confidence High, signature_severity Critical, tag RemoteAccessTool, updated_at 2023_11_27;
    target:src_ip;
)