Short bio

PUP.Optional.Vosteran is Malwarebytes’ detection name for a browser hijacker that usually comes in the form of a browser extension. It targets Google Chrome, Mozilla Firefox, Internet Explorer, and Opera and changes the start page and search engine settings.

Vosteran used to bundle their own browser with other software.

Type and source of infection

PUP.Optional.Vosteran is usually installed by the users themselves, whether as a standalone extension or bundled with other software.


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

block PUP.Optional.Vosteran

Malwarebytes blocks PUP.Optional.Vosteran


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

  1. Please download Malwarebytes to your desktop.
  2. Double-click MBSetup.exe and follow the prompts to install the program.
  3. When your Malwarebytes for Windows installation completes, the program opens to the Welcome to Malwarebytes screen.
  4. Click on the Get started button.
  5. Click Scan to start a Threat Scan.
  6. Click Quarantine to remove the found threats.
  7. Reboot the system if prompted to complete the removal process.

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.

  • Open Malwarebytes for Windows.
  • Click the Detection History
  • Click the Allow List
  • To add an item to the Allow List, click Add.
  • Select the exclusion type Allow a file or folder and use the Select a folder button to select the main folder for the software that you wish to keep.
  • Repeat this for any secondary files or folder(s) that belong to the software.

If you want to allow the program to connect to the Internet, for example to fetch updates, also add an exclusion of the type Allow an application to connect to the internet and use the Browse button to select the file you wish to grant access.


Associated files:

  • Vosteran.lnk
  • vosteran.exe

Associated Threats

  • PUP.Optional.Vosteran.A


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