""ET INFO Observed DNS over HTTPS Domain in TLS SNI (adguard .randomaizer .lentel .ru)""

SID: 2043521

Revision: 1

Class Type: misc-activity

Metadata: attack_target Client_Endpoint, created_at 2023_01_24, deployment Perimeter, signature_severity Informational, tag SSL_Malicious_Cert, updated_at 2023_01_24, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1572, mitre_technique_name Protocol_Tunneling

Reference:

• Link

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: "adguard.randomaizer.lentel.ru"

Within: 1

PCRE: "/^(?:\x00\x1d|.\x2e)adguard.randomaizer.lentel.ru/R"

Special Options:

source