Don’t download the apps from unofficial stores as they more likely to be dangerous. Many Android users uploaded ‘unkillable malware’.
Android 6 and 7 devices (which are dated now) make about 15% of the current users. xHelper malware is common mainly in Russia, Europe, and Southwest Asia.
“The main feature of xHelper is entrenchment,” explained Igor Golovin on Tuesday. “Once it gets into the phone, it somehow remains there even after the user deletes it and restores the factory settings.” It seems to be just ordinary app but a “dropper” trojan is pulled down from the internet, which collects device information and downloads and runs another trojan, which, in turn, downloads a set of exploit code that, when run, grants the malware root privileges on the device.
The best way to stay safe from malware is to only download the apps from official store where all the apps are checked.