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Detection rules › Sigma

CA Policy Removed by Non Approved Actor

Status
test
Severity
medium
Log source
product azure, service auditlogs
Author
Corissa Koopmans, '@corissalea'
Source
github.com/SigmaHQ/sigma

Monitor and alert on conditional access changes where non approved actor removed CA Policy.

Known false positives

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

MITRE ATT&CK coverage

TacticTechniques
Persistence
Privilege Escalation
Defense Impairment
Credential Access

Telemetry coverage

PlatformRecord / event type
AzureDelete conditional access policy

Rules detecting the same action

These rules filter on the same operation.

Rule body

title: CA Policy Removed by Non Approved Actor
id: 26e7c5e2-6545-481e-b7e6-050143459635
status: test
description: Monitor and alert on conditional access changes where non approved actor removed CA Policy.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-infrastructure#conditional-access
author: Corissa Koopmans, '@corissalea'
date: 2022-07-19
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: Delete 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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    properties.message: Delete conditional access policy

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
properties.messageeq
  • Delete conditional access policy
field:"properties.message" kind:eq value:"Delete conditional access policy"