""ET INFO Observed DNS over HTTPS Domain (doh .iucc .ac .il in TLS SNI)""

SID: 2053624

Revision: 1

Class Type: misc-activity

Metadata: attack_target Client_Endpoint, created_at 2024_06_13, deployment Perimeter, signature_severity Informational, tag DoH, updated_at 2024_06_13

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: "doh.iucc.ac.il"

Within: 1

PCRE: "/^(?:\x00\x0e|.\x2e)doh.iucc.ac.il/R"

Special Options:

source