Collect Microsoft Defender for Cloud alert logs

Overview

This parser extracts security alert data from Microsoft Defender for Cloud's JSON formatted logs. It transforms and maps the raw log fields into the Google SecOps UDM, handling various data types and nested structures, while also enriching the data with additional context and labels for improved analysis.

Before you begin

Ensure that you have the following prerequisites:

• Google SecOps instance.
• Privileged access to Microsoft Defender for Cloud.

Set up feeds

To configure a feed, follow these steps:

1. Go to SIEM Settings > Feeds.
2. Click Add New Feed.
3. On the next page, click Configure a single feed.
4. In the Feed namefield, enter a name for the feed; for example, Microsoft Defender for Cloud alert logs.
5. Select Webhookas the Source type.
6. Select Microsoft Defender for Cloudas the Log type.
7. Click Next.
8. Optional: specify values for the following input parameters:
   • Split delimiter: the delimiter that is used to separate log lines, such as \n .
9. Click Next.
10. Review the feed configuration in the Finalizescreen, and then click Submit.
11. Click Generate Secret Keyto generate a secret key to authenticate this feed.
12. Copy and store the secret key. You cannot view this secret key again. If needed, you can regenerate a new secret key, but this action makes the previous secret key obsolete.
13. On the Detailstab, copy the feed endpoint URL from the Endpoint Informationfield. You need to specify this endpoint URL in your client application.
14. Click Done.

Create an API key for the webhook feed

1. Go to Google Cloud console > Credentials.

   Go to Credentials

2. Click Create credentials, and then select API key.

3. Restrict the API key access to the Google Security Operations API.

Specify the endpoint URL

1. In your client application, specify the HTTPS endpoint URL provided in the webhook feed.

2. Enable authentication by specifying the API key and secret key as part of the custom header in the following format:

    X-goog-api-key = API_KEY 
   X-Webhook-Access-Key = SECRET 
    
   

   Recommendation: Specify the API key as a header instead of specifying it in the URL. If your webhook client doesn't support custom headers, you can specify the API key and secret key using query parameters in the following format:

     ENDPOINT_URL 
   ?key= API_KEY 
   &secret= SECRET 
    
   

Replace the following:

• ENDPOINT_URL : the feed endpoint URL.
• API_KEY : the API key to authenticate to Google Security Operations.
• SECRET : the secret key that you generated to authenticate the feed.

Create Azure Logic App

1. Sign in to Azure Portal (https://portal.azure.com).
2. Click Create a resourceand search for Logic App.
3. Click Createto start the deployment process.
4. Configure Logic App:
   • Name: Provide a descriptive name for the Logic App (for example, GoogleSecOpsWebhook).
   • Subscription: Select the appropriate subscription.
   • Resource Group: Choose an existing resource group or create a new one.
   • Location: Choose the location closest to your environment.
   • Log Analytics: Enable this option if you want to log diagnostic data for the Logic App.
5. Click Review + Createto create the Logic App.
6. Click Createto deploy the Logic App.

Configure Azure Logic App Webhook connection

1. Go to the Logic App created in the previous step.
2. Click Development Tools > Logic App Designer.
3. Click Add a trigger.

4. Search Microsoft Defender for Cloud > When a Microsoft Defender for Cloud alert is created or triggeredas the trigger.

5. Click Create newand follow the prompts to authenticate.

6. Click Insert a new stepto add a new step to the workflow.

7. Click Add an action.

8. Search for HTT.

9. Select HTTPas the action.

10. Configure the HTTP action:

    • URI: This is where you'll enter the Google SecOps API endpoint URL.
    • Method: POST
    • Add Content-Type header: Set the Content-Type as header key and application/json as header value. This tells Google SecOps the format of the data being sent.
    • Add API Key to queries: Set the key as the first query key and <API_KEY> as the query value. API_KEY is the generated API Key value during Google SecOps Feed configuration.
    • Add Secret Key to queries: Set the secret as the second query key and <SECRET_KEY> as the query value. SECRET_KEY is the generated Secret Key during Google SecOps Feed configuration.
    • Set Body from previous step: Click Enter request content > click Enter the data from previous steps(button with lightning icon to the left of the input field).

11. Click Save.

Configure Microsoft Defender Cloud Alerts Webhook

1. Go to Microsoft Defender for Cloud.
2. Click Management > Workflow automation.
3. Click Add workflow automation.
   • Name: Provide a descriptive name for the automation rule (for example, ForwardAlertsToGoogleSecOps).
   • Resource Group: Choose an existing resource group.
   • Defender for Cloud data type: Choose Security alert.
   • Alert severity: Choose Select all.
   • Show Logic App instances from the following subscriptions: Choose the subscription where the Logic App was created.
   • Select Logic App: Choose the Logic App created in the previous steps.
4. Click Createto save the workflow automation.

UDM Mapping Table

Log Field	UDM Mapping	Logic
AlertLink	principal.resource.attribute.labels.AlertLink.value	Directly mapped.
AlertName	security_result.rule_name	Directly mapped.
AlertSeverity	security_result.severity	Directly mapped if value is one of HIGH, MEDIUM, LOW, CRITICAL, UNKNOWN_SEVERITY. Otherwise mapped to security_result.severity_details . Value is converted to uppercase before comparison.
AlertType	security_result.threat_name	Directly mapped.
CompromisedEntity	principal.resource.attribute.labels.CompromisedEntity.value	Directly mapped.
Description	security_result.description	Directly mapped.
DisplayName	security_result.summary	Directly mapped.
EndTime	about.resource.attribute.labels.EndTime.value	Directly mapped.
Entities[].Location.City	principal.location.city	Directly mapped.
Entities[].Location.CountryName	principal.location.country_or_region	Directly mapped.
ExtendedLinks[].Category	about.resource.attribute.labels.extendedLink_Category.value	Directly mapped.
ExtendedLinks[].Href	about.resource.attribute.labels.extendedLink_Href.value	Directly mapped.
ExtendedLinks[].Label	about.resource.attribute.labels.extendedLink_Label.value	Directly mapped.
ExtendedLinks[].Type	about.resource.attribute.labels.extendedLink_Type.value	Directly mapped.
ExtendedProperties.Account Session Id	network.session_id	Directly mapped after renaming to accountSessionId .
ExtendedProperties.Alert Id	metadata.product_log_id	Directly mapped after renaming to alertId .
ExtendedProperties.Authentication type	extensions.auth.auth_details	Directly mapped after renaming to authenticationType .
ExtendedProperties.Client Application	principal.application	Directly mapped after renaming to clientApplication .
ExtendedProperties.Client Hostname	principal.asset.hostname , principal.hostname	Directly mapped after renaming to clientHostName .
ExtendedProperties.Client IP address	principal.asset.ip , principal.ip	Directly mapped after renaming to clientIpAddress .
ExtendedProperties.Client IP location	principal.location.country_or_region	Directly mapped after renaming to clientIpLocation .
ExtendedProperties.Client Location	principal.location.country_or_region	Directly mapped after renaming to clientLocation .
ExtendedProperties.Client Principal Name	principal.user.userid	Directly mapped after renaming to clientPrincipalName .
ExtendedProperties.Compromised Host	principal.asset.hostname , principal.hostname	Directly mapped after renaming to compromisedHost .
ExtendedProperties.Suspicious Command Line	target.process.command_line	Directly mapped after renaming to suspiciousCommandLine .
ExtendedProperties.Suspicious Process	target.process.file.full_path	Directly mapped after renaming to suspiciousProcess .
ExtendedProperties.Suspicious Process Id	target.process.pid	Directly mapped after renaming to suspiciousProcessId .
ExtendedProperties.User agent	network.http.user_agent	Directly mapped after renaming to userAgent .
ExtendedProperties.User Name	principal.user.user_display_name	Directly mapped after renaming to userName .
ExtendedProperties.resourceType	principal.resource.name	Directly mapped.
IsIncident	security_result.detection_fields.IsIncident.value	Directly mapped. Converted to string.
ProcessingEndTime	about.resource.attribute.labels.ProcessingEndTime.value	Directly mapped.
ProductName	metadata.product_name	Directly mapped.
ResourceId	principal.resource.product_object_id	Directly mapped.
SourceSystem	security_result.detection_fields.SourceSystem.value	Directly mapped.
StartTime	about.resource.attribute.labels.StartTime.value	Directly mapped.
Status	security_result.detection_fields.Status.value	Directly mapped.
SystemAlertId	metadata.product_log_id	Directly mapped.
Tactics	security_result.attack_details.tactics.name	Directly mapped.
TenantId	additional.fields.TenantId.string_value	Directly mapped.
TimeGenerated	about.resource.attribute.labels.TimeGenerated.value	Directly mapped.
VendorName	metadata.vendor_name	Directly mapped.
WorkspaceResourceGroup	target.resource.attribute.labels.WorkspaceResourceGroup.value	Directly mapped.
WorkspaceSubscriptionId	target.resource.attribute.labels.WorkspaceSubscriptionId.value	Directly mapped.
_Internal_WorkspaceResourceId	target.resource.product_object_id	Directly mapped.
properties.alertDisplayName	security_result.rule_name	Directly mapped.
properties.alertType	security_result.threat_name	Directly mapped.
properties.alertUri	principal.resource.attribute.labels.AlertUri.value	Directly mapped.
properties.correlationKey	principal.resource.attribute.labels.correlationKey.value	Directly mapped.
properties.description	security_result.description	Directly mapped.
properties.endTimeUtc	additional.fields.EndTime.string_value	Directly mapped.
properties.entities[].location.city	principal.location.city	Directly mapped.
properties.entities[].location.countryName	principal.location.country_or_region	Directly mapped.
properties.entities[].location.latitude	principal.location.region_coordinates.latitude	Directly mapped. Converted to float.
properties.entities[].location.longitude	principal.location.region_coordinates.longitude	Directly mapped. Converted to float.
properties.extendedProperties.alert_Id	metadata.product_log_id	Directly mapped.
properties.extendedProperties.clientApplication	principal.application	Directly mapped.
properties.extendedProperties.clientIpAddress	principal.asset.ip , principal.ip	Directly mapped. Parsed as IP address.
properties.extendedProperties.clientLocation	principal.location.country_or_region	Directly mapped.
properties.extendedProperties.clientPrincipalName	principal.user.userid	Directly mapped.
properties.extendedProperties.compromisedEntity	principal.resource.attribute.labels.CompromisedEntity.value	Directly mapped.
properties.extendedProperties.resourceType	principal.resource.name	Directly mapped.
properties.IsIncident	security_result.detection_fields.isIncident.value	Directly mapped. Converted to string.
properties.productName	metadata.product_name	Directly mapped.
properties.resourceIdentifiers[].<key>	additional.fields.<key>_<index>.string_value	Directly mapped. Keys $id and type are appended with the index of the element in the array.
properties.severity	security_result.severity	Directly mapped if value is one of HIGH, MEDIUM, LOW, CRITICAL, UNKNOWN_SEVERITY. Otherwise mapped to security_result.severity_details . Value is converted to uppercase before comparison.
properties.startTimeUtc	additional.fields.StartTime.string_value	Directly mapped.
properties.status	security_result.detection_fields.Status.value	Directly mapped.
properties.timeGeneratedUtc	additional.fields.TimeGenerated.string_value	Directly mapped. Set to "MICROSOFT_DEFENDER_CLOUD_ALERTS" if not provided in the log. Set to "MICROSOFT_DEFENDER_CLOUD_ALERTS". Set to "USER_RESOURCE_ACCESS" if principal or target are present, otherwise set to "GENERIC_EVENT".

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