The Evercoss U50A Android device with a build fingerprint of EVERCOSS/U50A./EVERCOSS:7.0/NRD90M/1499911028:eng/test-keys contains a pre-installed app with a package name of com.qiku.cleaner app (versionCode=2, versionName=2.0_VER_2017.04.21_17:55:55) that allows other pre-installed apps to perform system properties modification via an accessible app component. This capability can be accessed by any pre-installed app on the device which can obtain signatureOrSystem permissions that are required by other other pre-installed apps that exported their capabilities to other pre-installed app.