azure-vm-deallocate-unalerted: Azure Virtual Machine Deallocate Alert Not Configured

id: azure-vm-deallocate-unalerted
info:
  name: Azure Virtual Machine Deallocate Alert Not Configured
  author: princechaddha
  severity: high
  description: |
    Ensure that an Azure activity log alert is fired whenever "Deallocate Virtual Machine" events are triggered within your Microsoft Azure cloud account. An Azure activity log alert is triggered when a new activity log event that matches the condition specified in the alert configuration occurs. For this conformity rule, the matched condition is `Whenever the Administrative Activity Log "Deallocate Virtual Machine (Microsoft.Compute/virtualMachines)" has "any" Event level, with "any" Status and Event initiated by "any"`.
  impact: |
    Without an alert for "Deallocate Virtual Machine" events, unauthorized or unintended shutdowns of VMs may occur without detection, leading to potential disruptions and security risks.
  remediation: |
    Configure Azure activity log alerts to detect "Deallocate Virtual Machine" events by setting the alert condition to "Microsoft.Compute/virtualMachines/deallocate/action" and ensuring that alerts trigger notifications appropriately.
  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/deallocate/action"
        negative: true

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