https://www.bleepingcomputer.com/news/security/selfie-android-apps-with-15m-installs-push-ads-can-record-audio/

A couple of Android apps found in Google Play included functionality that stealthy recording audio without user consent. The apps posed as selfie camera filters and had been installed over 1.5 million times.

The main activity of the two apps was not spying on users but aggressively pushing adware that covered the entire screen of the Android device.