ET INFO Ordns DNS Over HTTPS Certificate Inbound

Query · suricata

flow:established,to_client;
threshold:type limit, track by_src, count 1, seconds 300;
tls.cert_subject;
content:"CN=ordns.he.net"; endswith; fast_pattern;
Raw source ET INFO Ordns DNS Over HTTPS Certificate Inbound · 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 tls $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET INFO Ordns DNS Over HTTPS Certificate Inbound";
    flow:established,to_client;
    threshold:type limit, track by_src, count 1, seconds 300;
    tls.cert_subject;
    content:"CN=ordns.he.net"; endswith; fast_pattern;
    reference:url,developers.cloudflare.com/1.1.1.1/dns-over-https/request-structure/;
    classtype:misc-activity;
    sid:2035859; rev:2;
    metadata:created_at 2022_04_07, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_07;
)

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