Description:
Create an activity log alert for the Create or Update Network Security Group Rule event.
Rationale:
Monitoring for Create or Update Network Security Group Rule events gives insight into network access changes and may reduce the time it takes to detect suspicious activity.
Default Value:
By default, no monitoring alerts are created.
Audit:
From Azure Console
Navigate to Monitor' / 'Alerts
Select Manage alert rules
Click on the Alert Name where Condition contains operationName equals Microsoft.Network/networkSecurityGroups/securityRules/write
Hover a mouse over Condition to ensure it is set to Whenever the Administrative Activity Log "Create or Update Security Rule (networkSecurityGroups/securityRules)" has "any" level with "any" status and event is initiated by "any"
Using Azure Command Line Interface
az account get-access-token --query "{subscription:subscription,accessToken:accessToken}" --out tsv | xargs -L1 bash -c 'curl -X GET -H "Authorization: Bearer $1" -H "Content-Type: application/json" https://management.azure.com/subscriptions/$0/providers/microsoft.insights/ac tivityLogAlerts?api-version=2017-04-01' | jq '.|.value[]|{location:.location,scopes:.properties.scopes,"condition":.proper ties.condition.allOf|.[]|select(.field=="operationName" and
.equals=="microsoft.network/networksecuritygroups/securityrules/write"),enabl ed:.properties.enabled}'Ensure that an alert exists where:
location is set to Global
Scopes is set to entire subscription that is /subscriptions/<Subscription_ID>
Enabled set to True
Condition Matches:
{ "location": "Global", "scopes": [ "/subscriptions/<Subscription_ID>" ], "condition": { "field": "operationName", "equals": "microsoft.network/networksecuritygroups/securityrules/write", "containsAny": null }, "enabled": true }
Remediation:
From Azure Console
Go to Monitor
Select Alerts
Click On New Alert Rule
Under Scope, click Select resource
Select the appropriate subscription under Filter by subscription
Select Network Security Group Rules under Filter by resource type
Select All for Filter by location
Click on the subscription resource from the entries populated under Resource
Click Done
Verify Selection preview shows Network Security Group Rules and your selected subscription name
Under Condition, click Add Condition
Select Create or Update Network Security Group Rule signal
Click Done
Under Action group, select Add action groups and complete creation process or select appropriate action group
Under Alert rule details, enter Alert rule name and Description
Select appropriate resource group to save the alert to
Check Enable alert rule upon creation checkbox
Click Create alert rule
Using Azure Command Line Interface
Use the below command to create an Activity Log Alert for Create or Update Network Security Groups rule
az account get-access-token --query "{subscription:subscription,accessToken:accessToken}" --out tsv | xargs -L1 bash -c 'curl -X PUT -H "Authorization: Bearer $1" -H "Content-Type: application/json"
https://management.azure.com/subscriptions/$0/resourceGroups/<Resource_Group_ To Create_Alert_In>/providers/microsoft.insights/activityLogAlerts/<Unique_Alert
_Name>?api-version=2017-04-01 -d@"input.json"'Where input.json contains the Request body JSON data as mentioned below.
{
"location": "Global", "tags": {}, "properties": {
"scopes": [ "/subscriptions/<Subscription_ID>"
],
"enabled": true, "condition": {
"allOf": [
{
"containsAny": null, "equals": "Administrative", "field": "category"
},
{
"containsAny": null, "equals":
"Microsoft.Network/networkSecurityGroups/securityRules/write", "field": "operationName"
}
]
},
"actions": { "actionGroups": [
{
"actionGroupId": "/subscriptions/<Subscription_ID>/resourceGroups/<Resource_Group_For_Alert_Gr oup>/providers/microsoft.insights/actionGroups/<Alert_Group>",
"webhookProperties": null
}
]
},
}
}Configurable Parameters for command line:
<Resource_Group_To Create_Alert_In>
<Unique_Alert_Name>Configurable Parameters for input.json:
<Subscription_ID> in scopes
<Subscription_ID> in actionGroupId
<Resource_Group_For_Alert_Group> in actionGroupId
<Alert_Group> in actionGroupId