I think its a Battery app and/or Task Killer app.
The reason is because I've seen that DU Battery saver has a floating optimizing icon,And there DU Speed Booster has a floating optimizing icon too.
EDIT: You could try to find it with File Explorer: https://play.google.com/store/apps/details?id=nextapp.fx&hl=en
Install it>>>Open>>>System>>>System>>>App,And see if you can find the app/icon in there.
The reason is because I've seen that DU Battery saver has a floating optimizing icon,And there DU Speed Booster has a floating optimizing icon too.
EDIT: You could try to find it with File Explorer: https://play.google.com/store/apps/details?id=nextapp.fx&hl=en
Install it>>>Open>>>System>>>System>>>App,And see if you can find the app/icon in there.
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