ET MALWARE GoBrut/StealthWorker Service Bruter CnC Checkin

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/knock?worker="; fast_pattern;
content:"&os=";
content:"&version=";
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";
Raw source ET MALWARE GoBrut/StealthWorker Service Bruter CnC Checkin · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE GoBrut/StealthWorker Service Bruter CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/knock?worker="; fast_pattern;
    content:"&os=";
    content:"&version=";
    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,bcb7d4fdee2023ad62132ebdf794baa4;
    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:2033719; rev:4;
    metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2019_05_22, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_09_17;
)

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