Joker is malware that targets Android devices. A new variant of it was detected in the Google Play store by researchers. Joker can act as a dropper for other malware and to subscribe victims to premium services. It is hidden inside what, to the victim, appears to be a legitimate app. To pass the Google checks on apps, the author of Joker basically used an obfuscation technique to hide its malicious code in the application as Base64 encoded strings. Once installed, Joker will begin communicating with its C&C server for instructions. The example shown in researchers report is an app for providing images of flowers to use as wallpaper.