ET INFO Observed DNS over HTTPS Domain in TLS SNI (basic .rethinkdns .com)

Query · suricata

flow:established,to_server;
tls.sni;
content:"basic.rethinkdns.com"; bsize:20; fast_pattern;
threshold:type both, count 1, seconds 600, track by_src;
Raw source ET INFO Observed DNS over HTTPS Domain in TLS SNI (basic .rethinkdns .com) · 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 DNS over HTTPS Domain in TLS SNI (basic .rethinkdns .com)";
    flow:established,to_server;
    tls.sni;
    content:"basic.rethinkdns.com"; bsize:20; fast_pattern;
    threshold:type both, count 1, seconds 600, track by_src;
    reference:url,rethinkdns.com;
    classtype:misc-activity;
    sid:2048507; rev:3;
    metadata:created_at 2022_02_09, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag DoH, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_01, former_sid 2851065, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1572, mitre_technique_name Protocol_Tunneling;
)

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