ET ATTACK_RESPONSE Muhstik Botnet Download Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.user_agent;
pcre:"/^(?:curl|wget)/i";
http.uri;
content:"/dk"; startswith; fast_pattern;
pcre:"/^[0-9]{2}$/R";
http.host;
pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
http.header_names;
content:!"Referer";
Raw source ET ATTACK_RESPONSE Muhstik Botnet Download Activity (GET) · 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 -> $EXTERNAL_NET any (
    msg:"ET ATTACK_RESPONSE Muhstik Botnet Download Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.user_agent;
    pcre:"/^(?:curl|wget)/i";
    http.uri;
    content:"/dk"; startswith; fast_pattern;
    pcre:"/^[0-9]{2}$/R";
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header_names;
    content:!"Referer";
    reference:url,www.lacework.com/blog/muhstik-takes-aim-at-confluence-cve-2021-26084/;
    reference:md5,898b3dc58bc5d05d3034a1c259b5a915;
    classtype:trojan-activity;
    sid:2033916; rev:1;
    metadata:created_at 2021_09_09, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_09;
)

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