ET MALWARE GoBrut/StealthWorker Service Bruter CnC Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE GoBrut/StealthWorker Service Bruter CnC Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/gw?worker="; fast_pattern;
    http.user_agent;
    content:"Mozilla/5.0 (X11|3b 20|Ubuntu|3b 20|Linux x"; depth:33;
    http.accept_enc;
    content:"gzip"; depth:4; endswith;
    http.header_names;
    content:!"Referer";
    reference:md5,1b8052d60de7ce8a9d281cf43d8d3091;
    reference:url,blog.yoroi.company/research/gobrut-a-new-golang-botnet/;
    reference:url,blog.yoroi.company/research/new-gobrut-version-in-the-wild/;
    classtype:command-and-control;
    sid:2033718; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_05_22, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_09_17, reviewed_at 2024_02_20;
)