ET SCAN Simple Slowloris Flooder

Query · suricata

flow:established,to_server;
threshold:type limit, track by_src, count 1, seconds 300;
http.method;
content:"POST";
http.header;
content:"Content-length|3a 20|5235|0d 0a|"; fast_pattern;
http.header_names;
content:!"User-Agent|0d 0a|";
Raw source ET SCAN Simple Slowloris Flooder · Suricata
Esc
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 -> $HTTP_SERVERS any (
    msg:"ET SCAN Simple Slowloris Flooder";
    flow:established,to_server;
    threshold:type limit, track by_src, count 1, seconds 300;
    http.method;
    content:"POST";
    http.header;
    content:"Content-length|3a 20|5235|0d 0a|"; fast_pattern;
    http.header_names;
    content:!"User-Agent|0d 0a|";
    reference:url,www.imperva.com/docs/HII_Denial_of_Service_Attacks-Trends_Techniques_and_Technologies.pdf;
    classtype:web-application-attack;
    sid:2016033; rev:5;
    metadata:created_at 2012_12_14, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_08;
)

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