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EDR Exclusions - file extensions with square brackets
Background: We applied for, and received the ability to access EDR Exclusions for our tenant due to some performance problems we were seeing. I think this might still be an early preview feature but am not 100% sure... Here is a screenshot of what I am referring to:
We have found a few other applications that had issues, including one that uses many different file extensions. Some of those files use square brackets in the extension name. This are valid files. However when I try to add them to our EDR Exclusions, I get an error "a valid extension must be specified"... which is frustrating because it is a valid extension.
Does anyone have a solution for this or know how to get Microsoft to fix this?
Thanks
Bspies1Unfortunately, there isn’t currently a direct way to add file extensions containing square brackets [] in Defender EDR Exclusions, and it looks like a product limitation or bug in the portal.
The most reliable workaround is to do a path or process exclusion rather than an extension-only exclusion. If that’s not workable, you should open a Microsoft Support case or use the Microsoft 365 Defender “Send feedback” or “Help + support” channels to request that they fix the validation rules to allow bracketed extensions.
Bspies1Unfortunately, there isn’t currently a direct way to add file extensions containing square brackets [] in Defender EDR Exclusions, and it looks like a product limitation or bug in the portal.
The most reliable workaround is to do a path or process exclusion rather than an extension-only exclusion. If that’s not workable, you should open a Microsoft Support case or use the Microsoft 365 Defender “Send feedback” or “Help + support” channels to request that they fix the validation rules to allow bracketed extensions.
