This not possible to mask any data written log files for SV components, but we do have a feature that will desensitize data during a recording.
Refer to documentation link: https://techdocs.broadcom.com/us/en/ca-enterprise-software/devops/devtest-solutions/10-7/using/using-service-virtualization/using-devtest-workstation-with-service-virtualization/de-identifying-data.html
You can also try setting the logging instead of INFO in the logging.properties file on the machine where your VSE and virtual services are running.
Change from log4j.logger.VSE=INFO, VSEAPP
Change to log4j.logger.VSE=WARN, VSEAPP
or log4j.logger.VSE=ERROR, VSEAPP
This will however affect being able to see certain information in the Inspection view in the Portal.
Found this KB article that should also help:
How to turn off logging at VS level