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Detection rules › Sigma

Bulk Deletion Changes To Privileged Account Permissions

Status
test
Severity
high
Log source
product azure, service auditlogs
Author
Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'
Source
github.com/SigmaHQ/sigma

Detects when a user is removed from a privileged role. Bulk changes should be investigated.

MITRE ATT&CK coverage

TacticTechniques
PersistenceT1098 Account Manipulation
Privilege EscalationT1098 Account Manipulation

Rule body yaml

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    properties.message:
        - Remove eligible member (permanent)
        - Remove eligible member (eligible)

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
properties.messageeq
  • Remove eligible member (eligible)
  • Remove eligible member (permanent)