Create an activity log alert for the Delete Network Security Group event.


Monitoring for "Delete Network Security Group" events gives insight into network access changes and may reduce the time it takes to detect suspicious activity.


From Azure Portal

1. Navigate to the Monitor blade

2. Click on Alerts

3. In the Alerts window, click on Alert rules

4. Hover mouse over the values in the Condition column to find an alert where

Operation name=Microsoft.Network/networkSecurityGroups/delete

5. Click on the Alert Name associated with the previous step

6. Click on the Condition name of Whenever the Activity Log has an event with Category='Administrative', Signal name='Delete Network Security Group (networkSecurityGroups)'

7. In the Configure signal logic window, ensure the following is configured:

o Event level: All selected

o Status: All selected

o Event initiated by: * (All services and users)

8. Click Done

9. Back in the < Alert Name > window, review Actions to ensure that an Action group is assigned to notify the appropriate personnel in your organization.

From Azure CLI

az monitor activity-log alert list --subscription <subscription ID> --query

Look for Microsoft.Network/networkSecurityGroups/delete in the output

From PowerShell

Get-AzActivityLogAlert -SubscriptionId <subscription ID>|where-object
{$_.ConditionAllOf.Equal -match


From Azure Portal

1. Navigate to the Monitor blade.

2. Select Alerts.

3. Select Create.

4. Select Alert rule.

5. Under Filter by subscription, choose a subscription.

6. Under Filter by resource type, select Network security groups.

7. Under Filter by location, select All.

8. From the results, select the subscription.

9. Select Done.

10.Select the Condition tab.

11.Under Signal name, click Delete Network Security Group (Microsoft.Network/networkSecurityGroups).

12.Select the Actions tab.

13.To use an existing action group, click Select action groups. To create a new action group, click Create action group. Fill out the appropriate details for the selection.

14.Select the Details tab.

15.Select a Resource group, provide an Alert rule name and an optional Alert rule description.

16.Click Review + create.

17.Click Create.

From Azure CLI

az monitor activity-log alert create --resource-group "<resource group name>"
--condition category=Administrative and
operationName=Microsoft.Network/networkSecurityGroups/delete and
level=<verbose | information | warning | error | critical>--scope
"/subscriptions/<subscription ID>" --name "<activity log rule name>" --
subscription <subscription id> --action-group <action group ID> --location

From PowerShell

Create the Conditions object.

$conditions = @()
$conditions += New-AzActivityLogAlertAlertRuleAnyOfOrLeafConditionObject -
Equal Administrative -Field category
$conditions += New-AzActivityLogAlertAlertRuleAnyOfOrLeafConditionObject -
Equal Microsoft.Network/networkSecurityGroups/delete -Field operationName
$conditions += New-AzActivityLogAlertAlertRuleAnyOfOrLeafConditionObject -
Equal Verbose -Field level

Retrieve the Action Group information and store in a variable, then create the Actions object.

$actionGroup = Get-AzActionGroup -ResourceGroupName <resource group name> -
Name <action group name>
$actionObject = New-AzActivityLogAlertActionGroupObject -Id $actionGroup.Id

Create the Scope object

$scope = "/subscriptions/<subscription id>"

Create the Activity Log Alert Rule for Microsoft.Network/networkSecurityGroups/delete