The Asus ZenFone 4 Selfie Android device with a build fingerprint of asus/WW_Phone/ASUS_X00LD_1:8.1.0/OPM1.171019.011/15.0400.1809.405-0:user/release-keys contains a pre-installed app with a package name of com.log.logservice app (versionCode=1, versionName=1) that allows any app co-located on the device to modify a system property through an exported interface without proper authorization.