Once installed on an Android user’s phone, Joker gets to work silently signing users up for subscription services. There’s another nasty strain of floating around on Android that could cost users a lot of money. The is known as “Joker” and is hidden inside at least 24 apps. Once installed on an Android user’s phone, Joker gets to work silently signing users up for subscription services. As Aleksejs Kuprins from cybersecurity company CSIS explains:Read Full Story