Ransomware ‘LeakerLocker’ encrypts personal data and sends it to all of your phone’s contacts. If you don’t pay the ransom, the data will be sent to your contacts. The app is available in the Google Play Store and has been removed from the store. It is not known if the app will be used to send the data to anyone else. The ransom is only a small part of the information that is sent to the victim’s phone. The information is then displayed on the screen of the app.
Source: https://thehackernews.com/2017/07/leakerlocker-android-ransomware.html