Corelight Zeek - Cloud SIEM

This section has instructions for collecting Corelight Zeek log messages and sending them to Sumo Logic to be ingested by CSE.

These instructions are for Corelight Zeek logs sent as JSON over syslog.

note

The CSE Network Sensor also utilizes Zeek, so If you're using the sensor, using Corelight Zeek would be redundant.

Step 1: Configure collection

In this step, you configure a Syslog Source to collect Corelight Zeek log messages. You can configure the source on an existing Installed Collector or create a new collector. If you’re going to use an existing collector, jump to Configure a Syslog Source below. Otherwise, create a new collector as described in Configure an Installed Collector below, and then create the Syslog Source on the collector.

Configure an Installed Collector

1. In the Sumo Logic platform, select Manage Data > Collection > Collection.
2. Click Add Collector.
3. Click Installed Collector.
4. The Add Installed Collector popup appears.
5. Download the appropriate collector for your operating system.
6. Install the collector. Instructions for your preferred operating system and method of installation are available on the Installed Collectors page.
7. Once the collector is installed, confirm it is available on the Collection page and select Edit.
8. The Edit Collector popup appears.
   
9. Name. Provide a Name for the Collector.
10. Description. (Optional)
11. Category. Enter a string to tag the output collected from the source. The string that you supply will be saved in a metadata field called _sourceCategory. 
12. Fields. If you are planning that all the sources you add to this collector will forward log messages to CSE, click the +Add Field link, and add a field whose name is _siemForward and value is true. This will cause the collector to forward all of the logs collected by all of the sources on the collector to CSE.
13. Click Save.
    note

    It’s also possible to configure individual sources to forward to CSE, as described in the following section.

Configure a Syslog Source

1. In Sumo Logic, select Manage Data > Collection > Collection. 
2. Navigate to the Installed Collector where you want to create the source.
3. On the Collectors page, click Add Source next to an Installed Collector.
4. Select Syslog. 
5. The page refreshes.
   
6. Name. Enter a name for the source. 
7. Description. (Optional) 
8. Protocol. Select the protocol that your syslog-enabled devices are currently using to send syslog data, UDP or TCP. For more information, see Choosing TCP or UDP on the Syslog Source page.
9. Port. Enter the port number for the Source to listen to. If the collector runs as root (default), use 514. Otherwise, consider 1514 or 5140. Make sure the devices are sending to the same port.
10. Source Category. Enter a string to tag the output collected from the source. The string that you supply will be saved in a metadata field called _sourceCategory. Make a note of the source category. You’ll supply it in Step 2 below.
11. Fields. If you have not configured the Installed Collector to forward all sources in the collector to CSE, click the +Add Field link, and add a field whose name is _siemForward and value is true.
12. Click Save.

Step 2: Configure Corelight Zeek

In this step you configure Zeek to send log messages to the Sumo Logic platform. For instructions, see Corelight JSON Streaming documentation.

Step 3: CSE Ingest Configuration

In this step, you configure a Sumo Logic Ingest Mapping in CSE for the source category assigned to your source or collector you configured in Step 1. The mapping tells CSE the information it needs to select the right mapper to process messages that have been tagged with that source category. 

1. Click the gear icon at the top of the CSE UI, and select Sumo Logic under Integrations.
   
2. On the Sumo Logic Ingest Mappings page, click Create.
   
3. On the Create Sumo Logic Mapping popup:
   1. Source Category. Enter the category you assigned to the HTTP Source or Hosted Collector in Step 1. 
   2. Format. Enter Bro/Zeek JSON.  
   3. Event ID. {_path}.
      
4. Click Create to save the mapping.

Step 4: Verify Ingestion

In this step, you verify that your logs are successfully making it into CSE. 

1. Click the gear icon at the top of the CSE UI, and select Log Mappings under Incoming Data.
   
2. On the Log Mappings page search for "Zeek" and check under Record Volume. 
   
3. For a more granular look at the incoming Records, you can also search the Sumo Logic platform for Corelight Zeek security records.