azure-vm-delete-unalerted: Azure Virtual Machine Delete Alert Not Configured

id: azure-vm-delete-unalerted
info:
  name: Azure Virtual Machine Delete Alert Not Configured
  author: princechaddha
  severity: high
  description: |
    Ensure that a Microsoft Azure activity log alert is fired whenever a "Delete Virtual Machine" event is triggered within your cloud account. An Azure activity log alert fires each time the action event that matches the condition specified in the alert configuration is triggered. The alert condition that this conformity rule searches for is `Whenever the Administrative Activity Log "Delete Virtual Machine (Microsoft.Compute/virtualMachines)" has "any" Event level, with "any" Status and Event initiated by "any"`.
  impact: |
    Not having alerts for "Delete Virtual Machine" events can allow unauthorized deletions to go unnoticed, posing significant risks to operational continuity and data integrity.
  remediation: |
    Configure activity log alerts to fire on "Delete Virtual Machine" events by setting the alert condition to "Microsoft.Compute/virtualMachines/delete" and ensure that notifications are managed by an attached action group.
  reference:
    - https://docs.microsoft.com/en-us/azure/azure-monitor/platform/alerts-activity-log
  tags: cloud,devops,azure,microsoft,virtual-machines,azure-cloud-config

flow: |
  code(1);
  for (let AlertData of iterate(template.alertList)) {
    set("id", AlertData);
    code(2);
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az monitor activity-log alert list --output json --query '[?(enabled==`true`)].id'

    extractors:
      - type: json
        name: alertList
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      az monitor activity-log alert show --ids "$id" --query 'condition'

    matchers-condition: and
    matchers:
      - type: word
        words:
          - '"field": "operationName"'

      - type: word
        words:
          - "Microsoft.Compute/virtualMachines/delete"
        negative: true

    extractors:
      - type: dsl
        dsl:
          - 'id + " does not have the correct alert configuration for Delete Virtual Machine events"'
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