Detection rules › Sigma
User Removed From Group With CA Policy Modification Access
Monitor and alert on group membership removal of groups that have CA policy modification access
Known false positives
- User removed from the group is approved
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | |
| Privilege Escalation | |
| Defense Impairment | |
| Credential Access |
Telemetry coverage
| Platform | Record / event type |
|---|---|
| Azure | Remove member from group |
Rules detecting the same action
These rules filter on the same operation.
- Conditional Access - Dynamic Group Exclusion Changes (Kusto)
- Detect suspicious conditional access policy modifications (Kusto)
- Detecting Impossible travel with mailbox permission tampering & Privilege Escalation attempt (Kusto)
- Entra ID Successful Group Deletion (YARA-L)
- Guest accounts added in Entra ID Groups other than the ones specified (Kusto)
Rule body
title: User Removed From Group With CA Policy Modification Access
id: 665e2d43-70dc-4ccc-9d27-026c9dd7ed9c
status: test
description: Monitor and alert on group membership removal 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: Remove 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: Remove member from group
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
properties.message | eq |
| field:"properties.message" kind:eq value:"Remove member from group" |