ET INFO Session Traversal Utilities for NAT (STUN Binding Request On Non-Standard High Port)

Query · suricata

xbits:set,ET.STUN,track ip_src,expire 60;
content:"|00 01|"; depth:2;
content:"|21 12 a4 42|"; fast_pattern; distance:2; within:4;

Rule dependencies

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Raw source ET INFO Session Traversal Utilities for NAT (STUN Binding Request On Non-Standard High Port) · 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 udp $HOME_NET any -> $EXTERNAL_NET [!3478,1023:] (
    msg:"ET INFO Session Traversal Utilities for NAT (STUN Binding Request On Non-Standard High Port)";
    xbits:set,ET.STUN,track ip_src,expire 60;
    content:"|00 01|"; depth:2;
    content:"|21 12 a4 42|"; fast_pattern; distance:2; within:4;
    reference:url,tools.ietf.org/html/rfc5389;
    classtype:misc-activity;
    sid:2033078; rev:5;
    metadata:created_at 2021_06_03, deployment Perimeter, deployment alert_only, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_06_01;
)

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