Versions (3)
Version DetailsCurrent
Rev: 5 • Jul 9, 2019, 12:00 PMET INFO Observed Cloudflare DNS over HTTPS Domain (cloudflare-dns .com in TLS SNI)
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;)
Jul 9, 2019, 12:00 PM
Oct 5, 2023, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-info.rules