VERY IMPORTANT

It was the middle of last year that we detected the start of mass attacks by the xHelper Trojan on Android smartphones, but even now the malware remains as active as ever. The main feature of xHelper is entrenchment — once it gets into the phone, it somehow remains there even after the user deletes it and restores the factory settings. We conducted a thorough study to determine how xHelper's creators furnished it with such survivability.