ET SCAN Possible WafWoof Web Application Firewall Detection Scan

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/<invalid>hello.html";
Raw source ET SCAN Possible WafWoof Web Application Firewall Detection Scan · 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 -> $HTTP_SERVERS any (
    msg:"ET SCAN Possible WafWoof Web Application Firewall Detection Scan";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/<invalid>hello.html";
    reference:url,code.google.com/p/waffit/;
    classtype:attempted-recon;
    sid:2011720; rev:5;
    metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_04;
)

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