Short bio

PUP.Optional.MailRu is Malwarebytes’ detection name for a large family of browser extensions.

Type and source of infection

PUP.Optional.MailRu is targeted at Windows systems and their installers are often bundled with applications aimed at the Russian market.


Malwarebytes protects users from PUP.Optional.MailRu by using real-time protection.

block PUP.Optional.MailRu

Malwarebytes blocks PUP.Optional.MailRu


Malwarebytes can detect and remove PUP.Optional.MailRu without further user interaction.

  1. Please download Malwarebytes to your desktop.
  2. Double-click mb3-setup-consumer-{version}.exe and follow the prompts to install the program.
  3. Then click Finish.
  4. Once the program has fully updated, select Scan Now on the Dashboard. Or select the Threat Scan from the Scan menu.
  5. If another update of the definitions is available, it will be implemented before the rest of the scanning procedure.
  6. When the scan is complete, make sure that all Threats are selected, and click Remove Selected.
  7. Restart your computer when prompted to do so.

Add an exclusion

Should users wish to keep this program and exclude it from being detected in future scans, they can add the program to the exclusions list. Here’s how to do it.

The Exclusions tab includes a list of items to be excluded from scans. The items may include files, folders, websites, or applications that connect to the Internet, as well as previously detected exploits.

To access the exclusions in Malwarebytes:

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