Two fake apps posing as fitness tools in the Apple App Store — “Fitness Balance” and “Calories Tracker” — used the Apple Touch ID to scam users out of a hundred dollars at a time. The malicious apps prompted users to use their fingerprints to access personal data, then, as the users pressed their fingers against the reader, the app tried to use the fingerprint to charge about $100 from any stored credit cards the user had on file.