Beats

We can use Elastic Beats to facilitate the shipping of endpoint logs to Security Onion’s Elastic Stack. Currently, testing has only been performed with Filebeat (multiple log types) and Winlogbeat (Windows Event logs).

Installation

To install a Beat, follow the instructions provided for the respective Beat, with the exception of loading the index template, as Security Onion uses its own template file to manage Beats fields.

Filebeat

https://www.elastic.co/guide/en/beats/filebeat/current/filebeat-installation.html

Winlogbeat

https://www.elastic.co/guide/en/beats/winlogbeat/current/winlogbeat-installation.html

*If installing Filebeat on a Linux distribution, you will want to ensure that the service is started after a reboot. We can ensure this by running the following commands after install:

sudo update-rc.d filebeat defaults

sudo update-rc.d filebeat enable

Firewall

To ensure a Beat is allowed to talk to Logstash on the Security Onion box, we need to run so-allow, and choose the b option for Beats. After choosing this option, simply provide the IP address of the machine on which the Beat is installed and press ENTER to confirm.

Log files

Filebeat

Windows: C:\\Program Files\Filebeat\filebeat.log

Linux: /var/log/filebeat/filebeat

Winlogbeat

C:\\Program Files\Winlogbeat\winlogbeat.log

Default fields: https://www.elastic.co/guide/en/beats/winlogbeat/master/exported-fields-eventlog.html

Data

Beats data can be viewed via the Beats dashboard, (or through the selection of the *:logstash-beats-* index pattern in Discover) in Kibana.

If you access the Beats dashboard and see logs but the visualizations have errors, you may need to refresh the logstash-beats-* field list as follows:

  • On the sidebar on the left, click Management.
  • Click Index Patterns.
  • Click logstash-beats-*.
  • Click the circular arrows in the upper right to refresh the field list.

Encryption

Beats communication with Elasticsearch/Logstash is not encrypted by default. If you require encryption, please consult the appropriate Elastic documentation to configure the use of TLS.