""ET INFO Observed Google DNS over HTTPS Domain (dns .google in TLS SNI)""

SID: 2047866

Revision: 3

Class Type: misc-activity

Metadata: affected_product Any, attack_target Client_Endpoint, created_at 2022_02_07, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag DoH, updated_at 2023_10_05, reviewed_at 2023_10_05, former_sid 2851058

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: "dns.google"

Within: 1

PCRE: "/^(?:\x00\x0a|.\x2e)dns.google/R"

Special Options:

source