EoRezo is a detection name that is in use for a big part of the adware family called Tuto4PC. The adware is usually harmless by itself, but that cant be said about the advertisements and sites it opens on the victims computer. This type of adware habitually opens a new window, or tab, of your default browser every 10 to 15 minutes, to fetch an advertisement or survey. Malicious Website Protection module that comes with Malwarebytes Anti-Malware Premium.”]
Source: https://blog.malwarebytes.com/puppum/2016/08/pup-friday-adware-family-eorezo/