""ET INFO Cloudflare DNS Over HTTPS Certificate Inbound""

SID: 2027671

Revision: 3

Class Type: misc-activity

Metadata: created_at 2019_07_03, signature_severity Informational, tag DoH, updated_at 2019_09_05

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: 443

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "|16|"

  • Value: "|0b|"

  • Value: "|55 04 06|"

  • Value: "|02|US"

  • Value: "|55 04 08|"

  • Value: "|0a|California"

  • Value: "|55 04 07|"

  • Value: "|0d|San Francisco"

  • Value: "|55 04 0a|"

  • Value: "|10|Cloudflare, Inc."

  • Value: "|55 04 03|"

  • Value: "|12|cloudflare-dns.com"

Within: 19

PCRE:

Special Options:

  • fast_pattern

source