ET VOIP Multiple Unauthorized SIP Responses TCP

Query · suricata

flow:established,from_server;
content:"SIP/2.0 401 Unauthorized"; depth:24;
threshold:type both, track by_src, count 5, seconds 360;
Raw source ET VOIP Multiple Unauthorized SIP Responses TCP · 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 5060 -> $EXTERNAL_NET any (
    msg:"ET VOIP Multiple Unauthorized SIP Responses TCP";
    flow:established,from_server;
    content:"SIP/2.0 401 Unauthorized"; depth:24;
    threshold:type both, track by_src, count 5, seconds 360;
    classtype:attempted-dos;
    sid:2003194; rev:6;
    metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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