Short bio

PUP.Optional.CrossBrowse is a Potentially Unwanted Program (PUP) that’s a member of the Crossrider family. Crossrider offers a highly configurable method for its clients to monetize their software. The common method to infect users is software bundlers. The CrossBrowse members of this family install Chromium build browsers to replace the user’s own browser, sometimes combined with extensions for Firefox and Internet Explorer. The overall goal of this PUP is to increase the amount of advertisement impressions shown to the user.


  • CrossBrowse is an example of a more advanced variant of Crossrider that hijacks many file associations.

Common infection method

PUP.Optional.CrossBrowse installs are typically triggered by bundlers that offer software you might be interested in, combined with adware or other monetizing methods.

Avoidance advice:


Malwarebytes completely removes this threat, unless specified explicitly in a dedicated removal guide.

Associated threats

  • PUP.Optional.Crossrider
  • PUP.Optional.Crossrider.A


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