CBC Data Forwarder: The custom query filter's "process_username" field does not seem to be filtering.

Products

• Carbon Black Cloud Enterprise EDR (formerly Cb Threathunter)

Issue/Introduction

For example, this custom query for the user "system" does not filter:

process_username:system

Environment

• Carbon Black Cloud Backend:  1.20 (as of December, 2023)
• Carbon Black Cloud Sensor:     All versions

Cause

There are a few syntax differences between the Data Forwarder custom query tool and the Investigate/Watchlist pages.
One of those is that the process_username is NOT tokenized in the Data Forwarder custom query. 
So for this case, "system" will not be a match for, say, "NT AUTHORITY\SYSTEM"

Resolution

For the Data Forwarder, use wildcards to match the entire string as so:

process_username:*\\system