ET POLICY Quad9 DNS Over TLS Certificate Inbound

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"C=US, ST=California, L=Berkeley, O=Quad9, CN=*.quad9.net"; endswith; fast_pattern;
Raw source ET POLICY Quad9 DNS Over TLS Certificate Inbound · 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 853 -> $HOME_NET any (
    msg:"ET POLICY Quad9 DNS Over TLS Certificate Inbound";
    flow:established,to_client;
    tls.cert_subject;
    content:"C=US, ST=California, L=Berkeley, O=Quad9, CN=*.quad9.net"; endswith; fast_pattern;
    reference:md5,1e686b56ccbcb28667698389703bb13a;
    classtype:policy-violation;
    sid:2027918; rev:3;
    metadata:attack_target Client_Endpoint, created_at 2019_08_26, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2020_09_17;
)

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