ET DOS High Orbit Ion Cannon (HOIC) Attack Inbound Generic Detection Double Spaced UA

Query · suricata

flow:established,to_server;
http.header.raw;
content:"User-Agent|3a 20 20|"; fast_pattern;
threshold:type both, track by_src, count 225, seconds 60;
Raw source ET DOS High Orbit Ion Cannon (HOIC) Attack Inbound Generic Detection Double Spaced UA · 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET DOS High Orbit Ion Cannon (HOIC) Attack Inbound Generic Detection Double Spaced UA";
    flow:established,to_server;
    http.header.raw;
    content:"User-Agent|3a 20 20|"; fast_pattern;
    threshold:type both, track by_src, count 225, seconds 60;
    reference:url,blog.spiderlabs.com/2012/01/hoic-ddos-analysis-and-detection.html;
    classtype:attempted-dos;
    sid:2014153; rev:9;
    metadata:created_at 2012_01_28, confidence Medium, signature_severity Major, updated_at 2024_03_11;
)

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