Control: 5.2.4 Ensure that Activity Log Alert exists for Delete Network Security Group

Description

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.

Remediation

From Azure Portal

1. Navigate to the Monitor blade
2. Click on Alerts
3. Click on Create
4. Click on Alert rule
5. Under the Scope tab, click Select scope
6. In the Select a resource window, select the appropriate filters:
   • Filter by subscription: < choose the subscription alerts are needed for >
   • Filter by resource location: Network security groups
   • Filter by location: All
   • Click on the subscription name or resource group or Network securiy group that the Log Alert Rule will be applied to
7. Verify that the selection preview shows:
   • All network securiy groups or < your network security group >`
   • < Resource Name > - The subscription, group, or resource you selected
8. Click Done
9. Under the Condition tab, click Add Condition (the Select a signal window may automatically open without clicking)
10. In the Select a signal window, under the "Signal Name" heading, click Delete Network Security Group (Microsoft.Network/networkSecurityGroups)
11. Under the Actions tab, choose appropriately:
    • Select action groups - If you have an existing action group to notify the necessary personnel.
    • Create action group - If you do not have an existing action group or want to create a new one.
12. Under the Details tab, fill in:
    • Resource group - Select the resource group you want the alert rule to reside in.
    • Alert rule name - Give your alert a recognizable and standardized name.
    • Alert rule description - (Optional)
13. Click Review + create then verify the summary details
14. Click Create

From Azure CLI

[Azure CLI has been temporarily removed from the Activity Log Alerts section in version 1.5 and will be added back in the next release]

Default Value

By default, no monitoring alerts are created.