ET MALWARE SearchLoader CnC Beacon

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"|2f|search|2f 3f|text|3d|"; fast_pattern; startswith;
pcre:"/^(?:[a-zA-Z0-9]){30}$/R";
http.header_names;
content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Cache|2d|Control|0d 0a 0d 0a|";
threshold:type limit,count 5,seconds 300,track by_src;
Raw source ET MALWARE SearchLoader CnC Beacon · Suricata
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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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE SearchLoader CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"|2f|search|2f 3f|text|3d|"; fast_pattern; startswith;
    pcre:"/^(?:[a-zA-Z0-9]){30}$/R";
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Cache|2d|Control|0d 0a 0d 0a|";
    threshold:type limit,count 5,seconds 300,track by_src;
    classtype:trojan-activity;
    sid:2065564; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2025_10_29, deployment Perimeter, confidence High, signature_severity Major, tag SearchLoader, updated_at 2025_10_29;
)

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