PUM.Optional.NoDrives

Short bio

PUM.Optional.NoDrives is Malwarebytes’ detection name for a potentially unwanted modification (PUM) in the Windows registry where icons representing drives from My Computer and Windows Explorer are removed. This change also causes drive letters representing drives to not appear in the Open dialog box.

System modification

The following registry value data is modified:

Under
HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Policies\Explorer

From:
NoDrives=0

To:
NoDrives={number from 1 to 26}

Remediation

Malwarebytes can modify this registry value data back to its Windows default setting without user interaction.

Also, we advise users to do a full system scan as PUM.Optional.NoDrives could have been added to the system by malware or PUP.

Add an exclusion

When a Potentially Unwanted Modification (PUM) is detected on your computer, Malwarebytes for Windows does 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 Windows ignore a PUM, you must add the PUM to the Allow list. Here’s how to do it.

  1. When a PUM appears in the list of Scan results. PUM detected
  2. Uncheck the entry or entries related to the PUM.
  3. Then click on Next.
  4. You will see a prompt giving you several options.
  5. Choosing Always ignore will add the PUM to the Allow List.
  6. You can remove them there when you decide they should no longer be ignored.
  7. When the PUM is on the Allow list it will no longer show up in your Scan results.

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