sigmamediumHunting

New Root Certificate Authority Added

Detects newly added root certificate authority to an AzureAD tenant to support certificate based authentication.

MITRE ATT&CK

defense-evasioncredential-accesspersistenceprivilege-escalation

Detection Query

selection:
  OperationName: Set Company Information
  TargetResources.modifiedProperties.newValue|contains: TrustedCAsForPasswordlessAuth
condition: selection

Author

Harjot Shah Singh, '@cyb3rjy0t'

Created

2024-03-26

Data Sources

azureauditlogs

Platforms

azure

References

Tags

attack.defense-evasionattack.credential-accessattack.persistenceattack.privilege-escalationattack.t1556

Raw Content

title: New Root Certificate Authority Added
id: 4bb80281-3756-4ec8-a88e-523c5a6fda9e
status: test
description: Detects newly added root certificate authority to an AzureAD tenant to support certificate based authentication.
references:
    - https://posts.specterops.io/passwordless-persistence-and-privilege-escalation-in-azure-98a01310be3f
    - https://goodworkaround.com/2022/02/15/digging-into-azure-ad-certificate-based-authentication/
author: Harjot Shah Singh, '@cyb3rjy0t'
date: 2024-03-26
tags:
    - attack.defense-evasion
    - attack.credential-access
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1556
logsource:
    product: azure
    service: auditlogs
detection:
    selection:
        OperationName: 'Set Company Information'
        TargetResources.modifiedProperties.newValue|contains: 'TrustedCAsForPasswordlessAuth'
    condition: selection
falsepositives:
    - Unknown
level: medium