""ET INFO Observed Cloudflare DNS over HTTPS Domain (cloudflare-dns .com in TLS SNI)""
SID: 2027695
Revision: 4
Class Type: misc-activity
Metadata: affected_product Any, attack_target Client_Endpoint, created_at 2019_07_09, deployment Perimeter, performance_impact Low, signature_severity Informational, tag DoH, updated_at 2023_10_05, reviewed_at 2024_04_22
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: 443
Flow: established,to_server
Contents:
-
Value: "|16|"
-
Value: "|01|"
-
Value: "|00 00|"
-
Value: "|00|"
-
Value: "cloudflare-dns.com"
Within: 1
PCRE: "/^(?:\x00\x12|.\x2e)cloudflare-dns.com/R"
Special Options: