Ummhlpr virus is the program that spreads on macOS devices when Unpollute My Mac gets installed and shows questionable pop-up errors. Ummhlpr virus is the unwanted application that gets installed with the rogue system optimizer and causes pop-up messages stating about the possible damage. This is not a malicious program, but it causes frustration and runs in the background affecting the speed significantly. As for the initial program that infiltrated the machine, Unpollute My Mac is a tool advertised as a utility that optimizes the macOS devices and solves problems regarding the corrupted files or even malware. Unfortunately, those claims are not real and there is no reason to use such rogue tools as legitimate system programs. When the potentially unwanted program gets on the machine you are forced to encounter various issues like system freezes and pop-up errors.