Rusearcher.com is a browser hijacker. It gets on your PC together with malware. As a result the default search is blocked by the Group Policy and all your search queries are redirected to go.mail.ru. The site itself is absolutely useless. Here is how to remove http://rusearcher.com from Chrome browser and restore the search engine.
How to remove Rusearcher.com
STEP 1. Download the latest version of AdwCleaner. Scan your PC and remove rusearcher installer and get rid of all other adware:
STEP 2. Remove the Group Policy to unlock the search engine setting in Chrome following these steps:
STEP 3. Now, when the default search setting is unlocked, assign Google (or whatever you prefer) to be the default search in browser:
STEP 4. Remove http://rusearcher.com from Startup pages and Home page settings: