If you have recently noticed that your browser redirects your search queries through mkob.xyz, then there is a high probability that it was recently hijacked. Keep in mind that they hijacker may be formalized by some nasty browser add-on (extension), so you should search carefully for the information dedicated to removing the extension in a proper manner. Of course, you could do the job manually very well, however, often manual browser fix is not sufficient enough. The problems with browser redirections via mkob.xyz may be much deeper than you think.