""ET INFO Observed DNS Over HTTPS Domain (dns .alidns .com in TLS SNI)""
SID: 2034912
Revision: 2
Class Type: misc-activity
Metadata: attack_target Client_Endpoint, created_at 2022_01_13, deployment Perimeter, signature_severity Informational, tag DoH, updated_at 2022_01_13, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1572, mitre_technique_name Protocol_Tunneling
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 0e|dns.alidns.com"
Within: 8
PCRE:
Special Options:
- fast_pattern