This guy calls it "grandma malware" because that's who he built it to target. It's a seemingly harmless-looking app that hides a nasty surprise.
The developer, Rudis Muiznieks, wrote an apologetic article in The Code Word about his past job working for a company targeting people like grandparents or others who might not be technologically adept. Consider this a warning.
The exploit starts with someone downloading software they aren't familiar with from a browser on their desktop, which watches and waits until they're logged in to an app store. Then the malware wirelessly installs evil software on their mobile device. The bad apps then harvest data from the mobile device, which is something you never want to happen.
This sort of attack can be prevented by ensuring your browsers and mobile operating systems are always running the latest versions. Muiznieks calls it "grandma malware" because less-experienced computer and smartphone owners don't necessarily know to upgrade. Click here to see if your browser needs to be updated.