ET INFO Observed DNS over HTTPS Domain in TLS SNI (ric .openbld .net)

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"ric.openbld.net"; fast_pattern;
pcre:"/CN=(?:[^\r\n]+?\.)?ric\.openbld\.net(?!\.)/";
Raw source ET INFO Observed DNS over HTTPS Domain in TLS SNI (ric .openbld .net) · Suricata
Esc
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 Observed DNS over HTTPS Domain in TLS SNI (ric .openbld .net)";
    flow:established,to_client;
    tls.cert_subject;
    content:"ric.openbld.net"; fast_pattern;
    pcre:"/CN=(?:[^\r\n]+?\.)?ric\.openbld\.net(?!\.)/";
    reference:url,github.com/curl/curl/wiki/DNS-over-HTTPS;
    classtype:misc-activity;
    sid:2045864; rev:2;
    metadata:created_at 2023_05_25, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag DoH, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1572, mitre_technique_name Protocol_Tunneling;
)

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