Azure Key Vault Modified or Deleted via Activity Log Operations

title: Azure Key Vault Modified or Deleted via Activity Log Operations
id: ae220ad4-d5fa-4bf2-b7fa-f718587a8a8d
status: test
description: This rule identifies Azure Activity Log events where a Key Vault is modified or deleted, based on specific Key Vault management operation names. Such changes can impact confidentiality and availability by altering vault configuration, access policies, or removing the vault. It relies on Azure Activity Log telemetry containing operationName values for write, delete, deploy action, and access policy updates.
references:
  - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
  - https://github.com/SigmaHQ/sigma/blob/master/rules/cloud/azure/activity_logs/azure_keyvault_modified_or_deleted.yml
author: Austin Songer @austinsonger, Huntrule Team
date: 2021-08-16
modified: 2022-08-23
tags:
  - attack.impact
  - attack.credential-access
  - attack.t1552
  - attack.t1552.001
logsource:
  product: azure
  service: activitylogs
detection:
  selection:
    operationName:
      - MICROSOFT.KEYVAULT/VAULTS/WRITE
      - MICROSOFT.KEYVAULT/VAULTS/DELETE
      - MICROSOFT.KEYVAULT/VAULTS/DEPLOY/ACTION
      - MICROSOFT.KEYVAULT/VAULTS/ACCESSPOLICIES/WRITE
  condition: selection
falsepositives:
  - Key Vault being modified or deleted may be performed by a system administrator.
  - Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.
  - Key Vault modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
level: medium
license: DRL-1.1
related:
  - id: 459a2970-bb84-4e6a-a32e-ff0fbd99448d
    type: derived