Hello,
If you activate the "Network Shares / Copy to Network" under Agent Monitoring (System / Agents / Agent Configuration) you will be able to control such traffic, however you can't specify which network path to monitor, so the monitoring will be applied to all network shares.
In terms of policy development, you will need to create a policy rule to detect File Properties -> Message Attachment -> File Type Match -> Other Formats (i.e. .exe it's included). If you have other specific file types to be added, you can create a match by file name and use for instance a wild card -> *.dll
Best regards,
Morgado