Help, my Safari browser has been acting super strange. It keeps changing my default browser from Google to Only Search, and my search bar will only search on Yahoo no matter what I do. On top of that I get MacKeeper popups every time I click a link

Question

Help, my Safari browser has been acting super strange lately!  It keeps changing my default browser automatically from Google to Only Search (if you use the search engine Only Search it takes you to Yahoo.com).  My search bar will only search on Yahoo no matter what I do to make it Google.  On top of that I get MacKeeper popups every time I click on a link.  What is worn with my computer and how do I fix it?!

Answer 1

There is no need to download anything to solve this problem. You may have installed a variant of the "VSearch" ad-injection malware.
Triple-click the line below on this page to select it, then copy the text to the Clipboard by pressing the key combination  command-C:
/Library/LaunchDaemons
In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.
A folder named "LaunchDaemons" may open. Look inside it for a file with a name of the form
          com.something.daemon.plist
Here something is a variable word, which can be different in each case. It could be "cloud," "dot," "highway," "submarine," "trusteddownloads," or pretty much anything else.
There may also be a file named
           com.something.helper.plist
in the same folder.
If you find files with names that fit the above description, post what you have for "something."