ET INFO Observed Cloudflare DNS over HTTPS Domain (cloudflare-dns .com in TLS SNI)

Query · suricata

flow:established,to_server;
threshold:type both, track by_src, count 1, seconds 600;
tls.sni; dotprefix;
content:".cloudflare-dns.com"; endswith;
Raw source ET INFO Observed Cloudflare DNS over HTTPS Domain (cloudflare-dns .com 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 Cloudflare DNS over HTTPS Domain (cloudflare-dns .com in TLS SNI)";
    flow:established,to_server;
    threshold:type both, track by_src, count 1, seconds 600;
    tls.sni; dotprefix;
    content:".cloudflare-dns.com"; endswith;
    reference:url,developers.cloudflare.com/1.1.1.1/dns-over-https/json-format;
    classtype:misc-activity;
    sid:2027695; rev:5;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2019_07_09, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag DoH, updated_at 2023_10_05, reviewed_at 2024_04_22;
)

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