Rule History

SID: 2027671 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 5 • Jul 3, 2019, 12:00 PM

Message:

ET INFO Cloudflare DNS Over HTTPS Certificate Inbound

Rule:

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Cloudflare DNS Over HTTPS Certificate Inbound"; flow:established,to_client; threshold:type limit, track by_src, count 1, seconds 300; tls.cert_subject; content:"C=US, ST=California, L=San Francisco, O=Cloudflare, Inc., CN=cloudflare-dns.com"; endswith; fast_pattern; reference:url,developers.cloudflare.com/1.1.1.1/dns-over-https/request-structure/; classtype:misc-activity; sid:2027671; rev:5; metadata:created_at 2019_07_03, confidence Medium, signature_severity Informational, tag DoH, updated_at 2020_09_17;)

Created:

Jul 3, 2019, 12:00 PM

Updated:

Sep 17, 2020, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

May 30, 2025, 12:04 AM

Filename:

rules/emerging-info.rules