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how to remove weknow.ac virus

My Mac Book is infected with weknow.ac virus. How can remove this virus?

MacBook, Mac OS X (10.6.8)

Posted on Sep 13, 2018 10:19 AM

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Question marked as Best answer

Thank you a lot. You saved my day!

Posted on Dec 1, 2018 2:47 AM

126 replies

Jul 28, 2020 7:49 PM in response to udayfromwalnut

So I had weknow.ac on my Macbook and the Apple Support guy on the phone had me do the following:


  • Update Safari search engine preferences to Google
  • Go to System Preferences -> Profiles -> Remove everything you see there
  • Download the free version of Malwarebytes (apparently the internal Apple policy is to recommend but not endorse this system, it's just what their support team uses when supporting customers)
  • Have Malwarebytes scan for threats and PUPs
  • Quarantine those threats and then remove them
  • Then go through each browser to remove extensions, clear caches, etc.
  • In Google Chrome specifically, we went into Settings and made sure everything was set to Google and then in the "Manage System Preferences" we were able to remove weknow.ac and other weird viruses.
  • We restarted my laptop, double checked everything, and all was well!


I hope this helps. If you do take the time to call Apple Support, mention using Malwarebytes and they can walk you through.

how to remove weknow.ac virus

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