CA Policy Updated by Non Approved Actor — Sigma Rule

Rule metadata and linked tags

Author: Corissa Koopmans, '@corissalea'. Source status: test; severity: medium. Source dates: 2022-07-19 / 2024-05-28.

{
  "product": "azure",
  "service": "auditlogs"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 5564bc54df9a3104b1e7e003028559f7d0f2ff4dd2ddec7b08d10abc7c60df75

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

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

Original YAML and metadata in JSON

False positives

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

Source references

• https://learn.microsoft.com/en-us/entra/architecture/security-operations-infrastructure#conditional-access