Bulk Deletion Changes To Privileged Account Permissions — Sigma Rule

Rule metadata and linked tags

Author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'. Source status: test; severity: high. Source dates: 2022-08-05 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 207ce2a26732f07d73ba5b947e50a1dce441980d77b22e0fb57e844d6fc5c913

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: Bulk Deletion Changes To Privileged Account Permissions
id: 102e11e3-2db5-4c9e-bc26-357d42585d21
status: test
description: Detects when a user is removed from a privileged role. Bulk changes should be investigated.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-identity-management#azure-ad-roles-assignment
author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'
date: 2022-08-05
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.t1098
logsource:
    product: azure
    service: auditlogs
detection:
    selection:
        properties.message:
            - Remove eligible member (permanent)
            - Remove eligible member (eligible)
    condition: selection
falsepositives:
    - Legtimate administrator actions of removing members from a role
level: high

Original YAML and metadata in JSON

False positives

• Legtimate administrator actions of removing members from a role

Source references

• https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-identity-management#azure-ad-roles-assignment