Around 40 million iOS devices in the U.S,Europe and Australia have been affected. Russian Oleg Pliss demanding a payment of $100 to unlock the device. Apple has issued support for users and there are suggestions to use a unique password only for the Apple ID as well as two-factor authentication and two-step verification process. Most of the passwords come from numerous data breaches that occurred over the time, including iMesh, VK.comMySpace,. Badoo.com, HotScripts.com and Mac-Forums.com.”]
Source: http://securityaffairs.co/wordpress/49305/cyber-crime/ios-devices-scam.html