Detection rules › Sigma
Certificate-Based Authentication Enabled
Detects when certificate based authentication has been enabled in an Azure Active Directory tenant.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | |
| Defense Impairment | |
| Credential Access |
Telemetry coverage
| Platform | Record / event type |
|---|---|
| Azure | Authentication Methods Policy Update |
Rules detecting the same action
These rules filter on the same operation.
- Azure MFA Disabled (Panther)
- Azure Policy Violation Detected (Panther)
- CA Policy Removed by Non Approved Actor (Sigma)
- CA Policy Updated by Non Approved Actor (Sigma)
- Changes to Device Registration Policy (Sigma)
- Conditional Access - A Conditional Access app exclusion has changed (Kusto)
- Conditional Access - A Conditional Access Device platforms condition has changed (the Device platforms condition can be spoofed) (Kusto)
- Conditional Access - A Conditional Access policy was deleted (Kusto)
Rule body
title: Certificate-Based Authentication Enabled
id: c2496b41-16a9-4016-a776-b23f8910dc58
status: test
description: Detects when certificate based authentication has been enabled in an Azure Active Directory tenant.
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.credential-access
- attack.persistence
- attack.privilege-escalation
- attack.defense-impairment
- attack.t1556
logsource:
product: azure
service: auditlogs
detection:
selection:
OperationName: 'Authentication Methods Policy Update'
TargetResources.modifiedProperties|contains: 'AuthenticationMethodsPolicy'
condition: selection
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
OperationName: 'Authentication Methods Policy Update'
TargetResources.modifiedProperties|contains: 'AuthenticationMethodsPolicy'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
OperationName | eq |
| field:"OperationName" kind:eq value:"Authentication Methods Policy Update" |
TargetResources.modifiedProperties | match |
| field:"TargetResources.modifiedProperties" kind:match value:"AuthenticationMethodsPolicy" |