The TOR anonymity network is the perfect place to hide command-and-control, exfiltration, or ransomware payment through bitcoin. You would like to use firewall data to find TOR traffic on your network.
How to use Splunk software for this use case
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In addition, these Splunk resources might help you understand and implement this search:
Splunk OnDemand Services: Use these credit-based services for direct access to Splunk technical consultants with a variety of technical services from a pre-defined catalog. Most customers have OnDemand Services per their license support plan. Engage the ODS team at OnDemand-Inquires@splunk.