PUM.Optional.NoRun is Malwarebytes' detection name for potentially unwanted modifications (PUMs)in the Windows registry where the Runcommand from the Windows Start Menu and the New Task (Run)command from the Task Manager are removed.
The following registry value data are modified:UnderHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
From:NoRun=0
To:NoRun=1
UnderHKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
From:NoRun=0
To:NoRun=1
Malwarebytes can modify these registry values data back to their Windows default settings without user interaction.Also, we advise users to do a full system scan as PUM.Optional.NoRun could have been added to the system by malwareor PUP.
When a Potentially Unwanted Modification (PUM)is detected on your computer, Malwarebytes for Windowsdoes not know whether it was authorized. Optimization software, malware, and Potentially Unwanted Programs (PUPs) are known to make these types of changes, hence they are regarded as potentially unwanted by design.To have Malwarebytes for Windowsignore a PUM, you must add the PUM to the Allow list. Here’s how to do it.
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