The number of mobile ransomware victims across the globe has increased fourfold compared to a year ago, suggests a Kaspersky Lab report released last week. Kaspersky software protected 136,532 users targeted by ransomware from April 2015 to March 2016 — up from 35,413 in the year-ago period, the company said. “The growth curve may be less than that seen for PC ransomware, but it is still significant enough to confirm a worrying trend,” the report notes. It identifies several factors contributing to the growth of ransomware in general.