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I started seeing something new on my lock screen, before even swiping the lock screen. It was a large battery charging-status display with advertisements below that. At the upper left corner was a gear for setup. Touching that displayed "DU Quick Charge" with a little slider to turn it off. I turned it off and the display has never appeared again. But I want to know where this came from. A Google search gave me one article describing my issue exactly, except it involves different software than I have. The image provided is the same. Obviously "DU quick charge" is a library someone is selling. How do I find what software did this on my phone? It seems to have already disappeared from the recently updated list at the play store.