Account should have a activity log alert configured for creating or updating virtual machines
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Description
Create an activity log alert for the Create or Update Virtual Machine event.
Rationale
By implementing alerting on significant infrastructure changes in Microsoft Azure, you can detect unauthorized or unwanted activity.
From the console
- Navigate to Monitor.
- Select Activity Logs.
- Search the operation name Create or Update Virtual Machine.
- Click On New Alert Rule.
- Under Scope, select the Subscription and any Resource Groups that need monitoring.
- Configure Action groups if needed.
- In Details, provide a descriptive Alert rule name and description.
- Go to Tags and enter relevant tags.
- Click Review + create.
From the command line
az account get-access-token --query "{subscription:subscription,accessToken:accessToken}" --out tsv | xargs -L1 bash -c 'curl -X PUT -H "AuthorizationBearer $1" -H "Content-Typeapplication/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"'
input.json contains the request body JSON data mentioned below.
{
"location": "Global",
"tags": {},
"properties": {
"scopes": [
"/subscriptions/<Subscription_ID>"
],
"enabled": true,
"condition": {
"allOf": [
{
"containsAny": null,
"equals": "Administrative",
"field": "category"
},
{
"containsAny": null,
"equals": "Microsoft.Compute/virtualMachines/write",
"field": "operationName"
}
]
},
"actions": {
"actionGroups": [
{
"actionGroupId": "/subscriptions/<Subscription_ID>/resourceGroups/<Resource_Group_For_Alert_Group>/providers/microsoft.insights/actionGroups/<Alert_Group>",
"webhookProperties": null
}
]
},
}
}
Using PowerShell AZ cmdlets:
$ComplianceName = 'Create or Update Virtual Machine'
$Signal = 'Microsoft.Compute/virtualMachines/write'
$Category = 'Administrative'
$ResourceGroupName = 'MyResourceGroup'
$actiongroup = (Get-AzActionGroup -Name corenotifications -ResourceGroupName $ResourceGroupName)
$ActionGroupId = (New-Object Microsoft.Azure.Management.Monitor.Models.ActivityLogAlertActionGroup $ActionGroup.Id)
$Subscription = (Get-AzContext).Subscription
$location = 'Global'
$scope = "/subscriptions/$($Subscription.Id)"
$alertName = "$($Subscription.Name) - $($ComplianceName)"
$conditions = @(
New-AzActivityLogAlertCondition -Field 'category' -Equal $Category
New-AzActivityLogAlertCondition -Field 'operationName' -Equal $Signal
)
Set-AzActivityLogAlert -Location $location -Name $alertName -ResourceGroupName $ResourceGroupName -Scope $scope -Action $ActionGroupId -Condition $conditions
References
- https://docs.microsoft.com/en-us/azure/virtual-machines/windows/overview
- https://docs.microsoft.com/en-in/azure/azure-monitor/platform/alerts-activity-log
- https://docs.microsoft.com/en-in/rest/api/monitor/activitylogalerts/createorupdate
- https://docs.microsoft.com/en-in/rest/api/monitor/activitylogalerts/listbysubscriptionid
- https://docs.microsoft.com/en-us/azure/security/benchmarks/security-controls-v2-logging-threat-detection#lt-4-enable-logging-for-azure-resources
CIS Controls
Version 7: 6.3 Enable Detailed Logging. Enable system logging to include detailed information such as an event source, date, user, timestamp, source addresses, destination addresses, and other useful elements.
