Overlays are often used in Android malware.
They are actually a burden to other domains such as browser extensions. This research, by Marek Toth, shows how click jacking [on hidden overlays] can trick the end-user in sharing his/her entire password manager.

marektoth.com/blog/dom-based-e

If you prefer to read a curated version in French: infosec.exchange/@nono2357/115

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