Malware has infected 36.5 million Android devices with malicious ad-click software on Google Play Store. Malware developed by Korea-based Kiniwini and published under the moniker ENISTUDIO Corp. The malicious apps are actual legitimate games, but in the background, they act as a bridge to connect victim’s device to adware server. Google has now removed all above-mentioned malicious apps from Play Store, but since Google Bouncer is not sufficient to keep bad apps out of the official store, you have to be very careful about downloading apps.
Source: https://thehackernews.com/2017/05/android-adware-malware.html