ET INFO Observed Ordns DNS over HTTPS Domain (Ordns .he .net in TLS SNI)

Query · suricata

flow:established,to_server;
threshold:type both, track by_src, count 1, seconds 600;
tls.sni;
content:"ordns.he.net"; endswith;
Raw source ET INFO Observed Ordns DNS over HTTPS Domain (Ordns .he .net in TLS SNI) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET INFO Observed Ordns DNS over HTTPS Domain (Ordns .he .net in TLS SNI)";
    flow:established,to_server;
    threshold:type both, track by_src, count 1, seconds 600;
    tls.sni;
    content:"ordns.he.net"; endswith;
    reference:url,www.blackhillsinfosec.com/dns-over-https-for-cobalt-strike;
    classtype:misc-activity;
    sid:2035858; 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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