""ET POLICY Quad9 DNS Over TLS Certificate Inbound""

SID: 2027918

Revision: 2

Class Type: policy-violation

Metadata: attack_target Client_Endpoint, created_at 2019_08_26, deployment Perimeter, performance_impact Low, signature_severity Informational, updated_at 2019_08_26

Reference:

  • md5

  • 1e686b56ccbcb28667698389703bb13a

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: 853

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "|16|"

  • Value: "|0b|"

  • Value: "|06 03 55 04 06|"

  • Value: "|02|US"

  • Value: "|06 03 55 04 08|"

  • Value: "|0a|California"

  • Value: "|06 03 55 04 07|"

  • Value: "|08|Berkeley"

  • Value: "|06 03 55 04 0a|"

  • Value: "|05|Quad9"

  • Value: "|06 03 55 04 03|"

  • Value: "|0b|*.quad9.net"

Within: 12

PCRE:

Special Options:

  • fast_pattern

source