Detection rules › Sigma
User Added To Group With CA Policy Modification Access
Monitor and alert on group membership additions of groups that have CA policy modification access
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1556 Modify Authentication Process |
| Privilege Escalation | T1548 Abuse Elevation Control Mechanism |
| Defense Impairment | T1556 Modify Authentication Process |
| Credential Access | T1556 Modify Authentication Process |
Rule body yaml
title: User Added To Group With CA Policy Modification Access
id: 91c95675-1f27-46d0-bead-d1ae96b97cd3
status: test
description: Monitor and alert on group membership additions of groups that have CA policy modification access
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-infrastructure#conditional-access
author: Mark Morowczynski '@markmorow', Thomas Detzner '@tdetzner'
date: 2022-08-04
tags:
- attack.privilege-escalation
- attack.credential-access
- attack.persistence
- attack.defense-impairment
- attack.t1548
- attack.t1556
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message: Add member from group
condition: selection
falsepositives:
- User removed from the group is approved
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
properties.message: Add member from group
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
properties.message | eq |
|