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

SID: 2027695Rev: 51 views
History
Sourceet/open
CreatedJuly 9, 2019
UpdatedOctober 5, 2023
Classificationmisc-activity
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;)

References

urldevelopers.cloudflare.com/1.1.1.1/dns-over-https/json-format

Metadata

affected productAny
attack targetClient_Endpoint
created at2019_07_09
deploymentPerimeter
performance impactLow
confidenceHigh
signature severityInformational
tagDoH
updated at2023_10_05
reviewed at2024_04_22

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