A few weeks ago, I spoke at Black Hat Europe 2016 on Pocket-Sized Badness: Why Ransomware Comes as a Plot Twist in the Cat-Mouse Game. While watching mobile ransomware from April 2015 to April 2016, I noticed a big spike in the number of Android ransomware samples.
Article Link: http://www.viruss.eu/malware/mobile-ransomware-pocket-sized-badness-2/