ET POLICY HTTP OPTIONS invalid method case outbound

Query · suricata

flow:established,to_server;
content:"options "; depth:8; nocase;
content:!"OPTIONS "; depth:8;
Raw source ET POLICY HTTP OPTIONS invalid method case outbound · 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 tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (
    msg:"ET POLICY HTTP OPTIONS invalid method case outbound";
    flow:established,to_server;
    content:"options "; depth:8; nocase;
    content:!"OPTIONS "; depth:8;
    reference:url,www.w3.org/Protocols/rfc2616/rfc2616-sec9.html;
    classtype:bad-unknown;
    sid:2014382; rev:2;
    metadata:created_at 2012_03_15, confidence High, signature_severity Informational, updated_at 2019_07_26;
)

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