Esurf.biz belongs to the category of browser hijackers. There are several levels of infection. First one is simple: Esurf.biz was just set to be default search and homepage in browsers. Second case can be fixed only by experienced user. Esurf.biz can hijack shortcuts, replace all the browser settings in Google Chrome, Mozilla Firefox and Internet Explorer. It also may install protection module to prevent this changes from being reverted by user.