Adware family XavirAd hides itself within at least 50 apps available for download on Googles Play Store. The malware uses a component known as Andr/Infostl-BK to steal crucial user information. The apps previously available on Google Play like Add Text On A Photo have more than one million downloads to their name. In total, Yu observed as many as 55 million unique downloads of the compromised programs. The adware family goes to great lengths to remain undetected at the same time.”]
Source: https://grahamcluley.com/50-google-play-apps-found-containing-info-stealing-adware/