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Create Alert for "Delete Virtual Machine" Events

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Last updated: 12 August 2020
Risk level: High (not acceptable risk)
Rule ID: ActivityLog-010

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"`

This rule resolution is part of the Cloud Conformity Security & Compliance tool for Azure

Security

Using Microsoft Azure Monitor service to detect "Delete Virtual Machine" events will help you reduce the time needed to mitigate any accidental or intentional deletion of virtual machines (VMs) within your Azure account and improve the VM resources security and management.

Audit

To determine if there are any activity log alerts created for "Delete Virtual Machine" events in your Microsoft Azure cloud account, perform the following actions:

Using Azure Portal

01 Sign in to Azure Management Console.

02 Navigate to Azure Monitor blade at https://portal.azure.com/#blade/Microsoft_Azure_Monitoring/AzureMonitoringBrowseBlade/overview.

03 In the navigation panel, select Alerts to access all the alerts available in your cloud account.

04 On the Alerts page, click on the Manage alert rules button from the dashboard top menu to access the alert rules management page.

05 On the Rules page, select the subscription that you want to examine from the Subscription filter box and the Enabled option from the Status dropdown list, to return all the active alert rules created in the selected subscription.

06 Click on the name of the alert rule that you want to examine.

07 On the selected alert rule configuration page, check the condition expression listed in the CONDITION section. If the expression is different than Whenever the Administrative Activity Log "Delete Virtual Machine (Microsoft.Compute/virtualMachines)" has "any" level, with "any" status and event is initiated by "any", the selected alert rule is not configured to fire whenever "Delete Virtual Machine" events are triggered.

08 Repeat step no. 6 and 7 for the rest of the activity log alert rules available in the selected subscription. If none of the verified rules contain the expected condition, there are no activity log alerts created for "Delete Virtual Machine" events, within the selected Azure cloud account subscription.

09 Repeat steps no. 5 – 8 for each subscription created in your Microsoft Azure cloud account.

Using Azure CLI

01 Run monitor activity-log alert list command (Windows/macOS/Linux) using custom query filters to get the identifiers of the active activity log alert rules available in the current Azure subscription:

az monitor activity-log alert list
    --query '[?(enabled==`true`)].id'

02 The command output should return the requested activity log alert rule identifiers (IDs):

[
"/subscriptions/1234abcd-1234-abcd-1234-abcd1234abcd/resourceGroups/cloud-shell-storage-westeurope/providers/microsoft.insights/activityLogAlerts/cc-create-policy-assignment-alert",
"/subscriptions/1234abcd-1234-abcd-1234-abcd1234abcd/resourceGroups/cloud-shell-storage-westeurope/providers/microsoft.insights/activityLogAlerts/cc-delete-key-vault-alert",
"/subscriptions/1234abcd-1234-abcd-1234-abcd1234abcd/resourceGroups/cloud-shell-storage-westeurope/providers/microsoft.insights/activityLogAlerts/cc-delete-nsg-rule-alert"
]

03 Run monitor activity-log alert show command (Windows/macOS/Linux) using the ID of the alert rule that you want to examine as identifier parameter and custom query filters to list the condition(s) defined for the selected alert rule:

az monitor activity-log alert show
    --ids "/subscriptions/1234abcd-1234-abcd-1234-abcd1234abcd/resourceGroups/cloud-shell-storage-westeurope/providers/microsoft.insights/activityLogAlerts/cc-create-policy-assignment-alert"
    --query 'condition'

04 The command output should return the condition metadata for the selected alert rule:

{
  "allOf": [
    {
      "containsAny": null,
      "equals": "Policy",
      "field": "category",
      "odata.type": null
    },
    {
      "containsAny": null,
      "equals": "Microsoft.Authorization/policyAssignments/write",
      "field": "operationName",
      "odata.type": null
    }
  ],
  "odata.type": null
}

Verify the command output for a JSON object with the "field" property set to "operationName". If the JSON object's "equals" property is not set to "Microsoft.Compute/virtualMachines/delete", the selected activity log alert rule is not configured to fire whenever "Delete Virtual Machine" events get triggered.

05 Repeat step no. 3 and 4 for the rest of the alert rules available in the current subscription. If none of the verified rules contain the expected condition, there are no activity log alerts created for "Delete Virtual Machine" events, within the selected Azure account subscription.

06 Repeat steps no. 1 – 5 for each subscription available in your Microsoft Azure cloud account.

Remediation / Resolution

To implement a Microsoft Azure activity log alert for "Delete Virtual Machine (Microsoft.Compute/virtualMachines)" events, perform the following actions:

Using Azure Portal

01 Sign in to Azure Management Console.

02 Navigate to Azure Monitor blade at https://portal.azure.com/#blade/Microsoft_Azure_Monitoring/AzureMonitoringBrowseBlade/overview.

03 In the navigation panel, select Alerts to access the alerts available in your Azure cloud account.

04 On the Alerts page, click on the Manage alert rules button from the dashboard top menu to access the alert rules management page.

05 On the Rules page, select the Azure account subscription where you want to create the new alert rule, from the Subscription filter box.

06 Click New alert rule button from the dashboard top menu to initiate the alert rule setup process.

07 On the Create rule page, perform the following actions:

  1. In the Scope section, click Select and configure the target subscription that you wish to monitor. Once the appropriate Azure subscription is selected, click Done.
  2. In the Condition section, click Select condition to configure the alert rule condition. On Configure signal logic panel, find and select the signal with the name Delete Virtual Machine (Microsoft.Compute/virtualMachines). Leave the signal default settings unchanged to generate the right condition, i.e. Whenever the Administrative Activity Log "Delete Virtual Machine (Microsoft.Compute/virtualMachines)" has "any" Event level, with "any" Status and Event initiated by "any", then click Done to save the rule condition.
  3. In the Action group section, click Select action group to choose an existing action group to attach to the new alert rule or click Create action group button to create a new one. An action group is a collection of alert notification preferences defined for the selected Azure subscription. Azure Monitor service utilizes action groups to notify admin users when VM-based alerts are triggered.
  4. In the Alert rule details section, provide a unique name for the new rule in the Alert rule name box, type a short description in the Description box, and choose the resource group in which the new alert will be created, from the Save alert to resource group dropdown list.
  5. Make sure that Enable alert rule upon creation option is set to checked, then click Create alert rule to finish the rule setup process. It can take up to 5 minutes for an alert rule to become active.

08 Repeat steps no. 5 – 7 for each subscription created in your Microsoft Azure cloud account.

Using Azure CLI

01 Run monitor activity-log alert create command (Windows/macOS/Linux) to create a new Azure activity log alert that fires whenever a "Delete Virtual Machine" event is triggered in the current Microsoft Azure cloud subscription:

az monitor activity-log alert create
    --name cc-delete-virtual-machine-alert
    --description "Alert triggered by Delete Virtual Machine events"
    --resource-group Default-ActivityLogAlerts
    --action-group "/subscriptions/1234abcd-1234-abcd-1234-abcd1234abcd/resourcegroups/default-activitylogalerts/providers/microsoft.insights/actiongroups/cloudconformity%20action%20group"
    --condition category=Administrative and operationName=Microsoft.Compute/virtualMachines/delete

02 The command output should return the configuration metadata for the new activity log alert:

{
  "actions": {
    "actionGroups": [
      {
        "actionGroupId": "/subscriptions/1234abcd-1234-abcd-1234-abcd1234abcd/resourcegroups/default-activitylogalerts/providers/microsoft.insights/actiongroups/cloudconformity%20action%20group",
        "webhookProperties": null
      }
    ]
  },
  "condition": {
    "allOf": [
      {
        "containsAny": null,
        "equals": "Administrative",
        "field": "category",
        "odata.type": null
      },
      {
        "containsAny": null,
        "equals": "Microsoft.Compute/virtualMachines/delete",
        "field": "operationName",
        "odata.type": null
      }
    ],
    "odata.type": null
  },
  "description": "Alert triggered by Delete Virtual Machine events",
  "enabled": true,
  "id": "/subscriptions/1234abcd-1234-abcd-1234-abcd1234abcd/resourceGroups/Default-ActivityLogAlerts/providers/microsoft.insights/activityLogAlerts/cc-delete-virtual-machine-alert",
  "identity": null,
  "kind": null,
  "location": "Global",
  "name": "cc-delete-virtual-machine-alert",
  "resourceGroup": "Default-ActivityLogAlerts",
  "scopes": [
    "/subscriptions/1234abcd-1234-abcd-1234-abcd1234abcd/resourceGroups/Default-ActivityLogAlerts"
  ],
  "tags": {},
  "type": "Microsoft.Insights/ActivityLogAlerts"
}

03 Repeat step no. 1 and 2 for each subscription created in your Microsoft Azure cloud account.

References

Publication date Nov 28, 2019

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You are auditing:

Create Alert for "Delete Virtual Machine" Events

Risk level: High