ESET has discovered the first ever fake lockscreen app on Google Play, named Pokemon GO Ultimate. As its characteristics suggest, it deliberately locks the screen right after the app is started, forcing the user to restart the device. Unfortunately, in many cases a reboot is not available because the activity of the malicious app overlays all the other apps as well as system windows. The user needs to restart the device either by pulling out the battery or using Android Device Manager. After reboot, it runs in the background hidden from the victim, silently clicking on porn ads online.