The signer distinguished name (SDN) is required when you enable a digital signature check and exclude only files signed by a specified process signer.
Task
Select Menu → Reporting → Threat Event Log.
Click the Endpoint Security event to display details.
Select and copy the Source Process Signer details.
When creating exclusions, paste the Source Process Signer details as a single line of text to the Signed by field.
For example, the SDN required format is:
C=US, S=CALIFORNIA, L=MOUNTAIN VIEW, O=MOZILLA CORPORATION, OU=RELEASE ENGINEERING, CN=MOZILLA CORPORATION