What is Best Searcher?
The Malwarebytes research team has determined that Best Searcher is a search hijacker. These so-called "hijackers" manipulate your browser(s), for example to change your startpage or searchscopes, so that the affected browser visits their site or one of their choice.
This particular one closes the tab you searched in and opens a new tab using your search term in their own engine. How do I know if my computer is affected by Best Searcher?
You may see this entry in your list of installed Chrome extensions:
You may have noticed these warnings during install: