Unknown lock screen keeps appearing.

[Android Central Question]

This is the second time a ransom lock screen has appeared. The first time I had this issue it was the Peel Smart Remote app, which I disabled and the problem went away. This lock screen appears to be different from the Peel one. When I turn on my screen, my normal lock screen will appear for a split second then this one will appear. It has a simple background with the time, battery life, camera, and memory. After a second a random add will appear at the bottom. It gives me the option to disable it but only for one time. I cannot find the source and have not downloaded any new apps recently.

 

[belodion]

Nevertheless, does it persist in Safe Mode?