Galaxy Prime iLocker virus

Question

A friend's Galaxy Grand Prime was infected by a virus, I tried factory reset, and surprisingly the virus appeared on screen once factory reset completed and the phone restarted:
screen shot



I tried hard reset, but both secret code and key combination (HOME+VOLUME UP+POWER) not working.
The virus is really annoying, installing some apps like Hola and Biadu, and whenever I try to remove them, they are just there after restarting the phone.


— Megamind Saiko | Sources

Answer

Some malwares can use exploits to get root access and copy themselves to /system partition that is not wiped by the factory reset. You can find a good writing about them here. The only way that is %100 guaranteed to remove it completely is flashing Stock ROM. Find the Stock ROM for your device here and follow the instructions from here.


— SarpSTA | Sources

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