Configuring Azure Event Hub Connectors

Azure Event Hub connectors allow Stellar Cyber to ingest Azure events and add them to the data lake.

Stellar Cyber connectors with the Collect function (collectors) may skip collecting some data when the ingestion volume is large, which potentially can lead to data loss. This can happen when the processing capacity of the collector is exceeded.

Connector Overview: Azure Event Hub

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Adding an Azure Event Hub Connector

To add an Azure Event Hub connector:

1. Gather the Event Hub information
2. Add the connector in Stellar Cyber
3. Test the connector
4. Verify ingestion

Gathering the Event Hub Information

Gather the following Event Hub information.

The subscription plan needed for the Azure Event Hub connector is Basic.

• Eventhub Name: The name of the Event Hub

• Connection String: Find the connection string in Azure. You must use a unique connection string for each of your Stellar Cyber Azure Event Hub connector instances.

• Consumer Group: The consumer group for the Event Hub

• Event Source: The source of the events you want to ingest (you must configure these sources to send data to your Event Hub):

  • AzureActivityLog

  • AzureBastion

  • AzureFirewall

  • AzureKeyVault

  • AzureSecurityCenter

  • AzureSecurityGroups

  • AzureSQLServer (includes AuditEvent log )

  • AzureStorage

  • AzureSynapseWorkspace

  • AzureWebApplicationFirewall

Adding the Connector in Stellar Cyber

With the access information handy, you can add an Azure Event Hub connector in Stellar Cyber:

1. Log in to Stellar Cyber.

2. Click System | Integration | Connectors. The Connector Overview appears.

   

3. Click Create. The General tab of the Add Connector screen appears. The information on this tab cannot be changed after you add the connector.

   

   The asterisk (*) indicates a required field.

4. Choose PaaS from the Category drop-down.

5. Choose Azure Event Hub from the Type drop-down.

6. For this connector, the supported Function is Collect, which is enabled already.

7. Enter a Name.

   This field does not accept multibyte characters.

8. Choose a Tenant Name. The Interflow records created by this connector include this tenant name.

9. Choose the device on which to run the connector.

   • Certain connectors can be run on either a Sensor or a Data Processor. The available devices are displayed in the Run On menu. If you want to associate your collector with a sensor, you must have configured that sensor prior to configuring the connector or you will not be able to select it during initial configuration. If you select Data Processor, you will need to associate the connector with a Data Analyzer profile as a separate step. That step is not required for a sensor, which is configured with only one possible profile.

   • If the device you're connecting to is on premises, we recommend you run on the local sensor. If you're connecting to a cloud service, we recommend you run on the DP.

10. (Optional) When the Function is Collect, you can create Log Filters. For information, see Managing Log Filters.

11. Click Next. The Configuration tab appears.

    

    The asterisk (*) indicates a required field.

12. Enter the Azure Eventhub Name you copied earlier.

13. Enter the Connection String you copied earlier.

14. Enter the Consumer Group you copied earlier.

15. Select one or more Event Sources. The currently available sources are: 

    • Azure Activity Log

    • Azure Bastion

    • Azure Firewall

    • Azure KeyVault

    • Azure Security Center

    • Azure Security Groups

    • Azure SQL Server (includes AuditEvent log )

    • Azure Storage

    • Azure Synapse Workspace

    • Azure Web Application Firewall

      The order of the event sources in the above list dictates the content type that will be matched first. The event source that was added first will match first.

    • Custom Event Source (choose only if using optional Custom Event Sources)

16. (Optional) Use Custom Event Sources to set up customized event sources that pull specific types of data from Azure Event Hub.

    1. Enter a name for the Event Source Name that is unique within the connector. The name will be used for setting the msg_class in the following format: azure_<customer defined name delimited with underscores>.

    2. Enter a Regex, a Regular Expression that defines a unique string expected in the data, for example, abc*. The connector looks in Azure Event Hub and pulls any data that matches the Regex.

    3. Click the + sign to add another custom event source. The recommended maximum is 10.

       The order of the event sources in the list dictates the content type that will be matched first. The custom event source that appears in the list at the top will match first, meaning that the one added last will match first.

    4. Click the trash can to delete a custom event source.

17. Click Next. The final confirmation tab appears.

    

18. Click Submit.

    To pull data, a connector must be added to a Data Analyzer profile if it is running on the Data Processor.

19. If you are adding rather than editing a connector with the Collect function enabled and you specified for it to run on a Data Processor, a dialog box now prompts you to add the connector to the default Data Analyzer profile. Click Cancel to leave it out of the default profile or click OK to add it to the default profile.

    • This prompt only occurs during the initial create connector process when Collect is enabled.

    • Certain connectors can be run on either a Sensor or a Data Processor, and some are best run on one versus the other. In any case, when the connector is run on a Data Processor, that connector must be included in a Data Analyzer profile. If you leave it out of the default profile, you must add it to another profile. You need the Administrator Root scope to add the connector to the Data Analyzer profile. If you do not have privileges to configure Data Analyzer profiles, a dialog displays recommending you ask your administrator to add it for you.

    • The first time you add a Collect connector to a profile, it pulls data immediately and then not again until the scheduled interval has elapsed. If the connector configuration dialog did not offer an option to set a specific interval, it is run every five minutes. Exceptions to this default interval are the Proofpoint on Demand (pulls data every 1 hour) and Azure Event Hub (continuously pulls data) connectors. The intervals for each connector are listed in the Connector Types & Functions topic.

    The Connector Overview appears.

The new connector is immediately active.

Testing the Connector

When you add (or edit) a connector, we recommend that you run a test to validate the connectivity parameters you entered. (The test validates only the authentication / connectivity; it does not validate data flow).

1. Click System | Integrations | Connectors. The Connector Overview appears.

   

2. Locate the connector that you added, or modified, or that you want to test.

3. Click Test at the right side of that row. The test runs immediately.

   Note that you may run only one test at a time.

Display sample messages...

Success !

Failure with summary of issue: Show More example detail:

 

Verifying Ingestion

To verify ingestion:

1. Click Investigate | Threat Hunting. The Interflow Search tab appears.
2. Change the Indices to Syslog. The table immediately updates to show ingested Interflow records.

   For custom event sources, the unique name provided during configuration displays in Threat Hunting with a msg_class containing an azure prefix. For example, if the unique name is test, the msg_class in Threat Hunting is azure_test.