Sigma Rule Library

CA Policy Updated by Non Approved Actor

Monitor and alert on conditional access changes. Is Initiated by (actor) approved to make changes? Review Modified Properties and compare "old" vs "new" value.

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Detection logic

selection

properties.message: Update conditional access policy

Condition

selection

Raw YAML

title: CA Policy Updated by Non Approved Actor
id: 50a3c7aa-ec29-44a4-92c1-fce229eef6fc
status: test
description: Monitor and alert on conditional access changes. Is Initiated by (actor) approved to make changes? Review Modified Properties and compare "old" vs "new" value.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-infrastructure#conditional-access
author: Corissa Koopmans, '@corissalea'
date: 2022-07-19
modified: 2024-05-28
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: Update conditional access policy
    condition: selection
falsepositives:
    - Misconfigured role permissions
    - Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.
level: medium

False positives

  • Misconfigured role permissions
  • Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.

References

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