PUM.Optional.LowRiskFileTypes is Malwarebytes’detection name for a potentially unwanted modification (PUM) in the Windows registry where the system is allowed to see attached files of certain types on Microsoft Outlook as low risk, thus, enabling users to open or execute them without warning. In turn, the “Open File Security Warning” window does not pop up.
The following registry key and entry are added:
Malwarebytes deletes the created registry key without user interaction.
Also, we advise users to do a full system scan as PUM.Optional.LowRiskFileTypes modifications could have been done by malware or PUP.
Add an exclusion
When PUM is detected on your computer, Malwarebytes for Windows does not know if 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.
To have Malwarebytes for Windows ignore a PUM, you must add the PUM as an exclusion.
- Open Malwarebytes for Windows.
- Click Settings, then click the Protection tab.
- Scroll down to the bottom.
- Turn off Automatically quarantine detected malware.Turning this setting off prevents Malwarebytes for Windows from quarantining the PUM automatically.
- Go to the Dashboard, then click Scan Now.
- When the Threat Scan Results appear, uncheck the box next to the detected PUM you want to keep.
- Click Next.
- On the Remaining Items window, click Ignore Always to add the exclude the detected PUM(s).
- Turn on Automatically quarantine detected malware.To find this setting, click Settings > Protection.
When a PUM is excluded, Malwarebytes for Windows does not detect the PUM during scans or Real-Time Protection.
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