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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

Oct 26, 2018 7:38 PM in response to ChanelCinq

I am still having problems...I am sure it is a user error, but I need some help...This is what my Terminal looks like...Is this correct? Then I just close out my chrome? Do I have to uninstall it? And close out of my Terminal?

Last login: Fri Oct 26 20:26:01 on ttys000

Susans-iMac:~ SAMathis$ DefaultSearchProviderEnabled

-bash: DefaultSearchProviderEnabled: command not found

Susans-iMac:~ SAMathis$ DefaultSearchProviderName

-bash: DefaultSearchProviderName: command not found

Susans-iMac:~ SAMathis$ DefaultSearchProviderNewTabURL

-bash: DefaultSearchProviderNewTabURL: command not found

Susans-iMac:~ SAMathis$ DefaultSearchProviderSearchURL

-bash: DefaultSearchProviderSearchURL: command not found

Susans-iMac:~ SAMathis$ HomepageIsNewTabPage

-bash: HomepageIsNewTabPage: command not found

Susans-iMac:~ SAMathis$ HomepageLocation

-bash: HomepageLocation: command not found

Susans-iMac:~ SAMathis$ NewTabPageLocation

-bash: NewTabPageLocation: command not found

Susans-iMac:~ SAMathis$

Susans-iMac:~ SAMathis$

Oct 27, 2018 6:47 AM in response to grandmamathis

You need to open the "Terminal" application (use the search functionality at the top-right to find it). Then copy and paste, one by one, the commands from my above post into the terminal prompt, hitting enter after pasting each.


All I had to do then was use the command line to delete / modify the affected policies:


defaults write com.google.Chrome HomepageIsNewTabPage -bool false

defaults write com.google.Chrome NewTabPageLocation -string "https://www.google.com/"

defaults write com.google.Chrome HomepageLocation -string "https://www.google.com/"

defaults delete com.google.Chrome DefaultSearchProviderSearchURL

defaults delete com.google.Chrome DefaultSearchProviderNewTabURL

defaults delete com.google.Chrome DefaultSearchProviderName


The changes will not take effect until you restart Chrome.


I recommend following some of the other pieces of advice in this thread, ie definitely do a malware scan too.

Nov 11, 2018 2:16 PM in response to ChanelCinq

Hello ChanelCinq,


After reading so many positive replies I got excited as well. I am getting stuck at typing the mentioned commands in Terminal and it looks as below for me:


Last login: Sun Nov 11 17:06:18 on ttys000

Jigneshs-MBP:~ jiggy$ defaults write com.google.Chrome HomepageIsNewTabPage -bool false

Jigneshs-MBP:~ jiggy$

Jigneshs-MBP:~ jiggy$ defaults write com.google.Chrome NewTabPageLocation -string "https://www.google.com/"

Jigneshs-MBP:~ jiggy$

Jigneshs-MBP:~ jiggy$ defaults write com.google.Chrome HomepageLocation -string "https://www.google.com/"

Jigneshs-MBP:~ jiggy$

Jigneshs-MBP:~ jiggy$ defaults delete com.google.Chrome DefaultSearchProviderSearchURL

2018-11-11 17:13:30.021 defaults[6240:94366]

Domain (com.google.Chrome) not found.

Defaults have not been changed.

Jigneshs-MBP:~ jiggy$

Jigneshs-MBP:~ jiggy$ defaults delete com.google.Chrome DefaultSearchProviderNewTabURL


defaults delete com.google.Chrome DefaultSearchProviderName

2018-11-11 17:13:30.080 defaults[6241:94370]

Domain (com.google.Chrome) not found.

Defaults have not been changed.

Jigneshs-MBP:~ jiggy$

Jigneshs-MBP:~ jiggy$ defaults delete com.google.Chrome DefaultSearchProviderName

2018-11-11 17:13:30.136 defaults[6243:94383]

Domain (com.google.Chrome) not found.

Defaults have not been changed.

Jigneshs-MBP:~ jiggy$


Looks like, I am unable to select correct Terminal for this to function. Can you please elaborate further on actual steps involving the use of Terminal? I would really appreciate your help with this as nothing else seem to work with this issue.


Thank you.

how to remove weknow.ac virus

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