ET INFO FUNNULL CDN System Error (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/system/error"; startswith;
http.host; bsize:15;
content:"cdn.funnull.com"; fast_pattern;
Raw source ET INFO FUNNULL CDN System Error (GET) · 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 INFO FUNNULL CDN System Error (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/system/error"; startswith;
    http.host; bsize:15;
    content:"cdn.funnull.com"; fast_pattern;
    reference:url,silentpush.com/blog/infrastructure-laundering/;
    reference:url,silentpush.com/blog/triad-nexus-funnull/;
    classtype:bad-unknown;
    sid:2061982; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2025_04_29, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2025_04_29;
)

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