New ransomware Jaff demands $3,700 payments

Attackers behind the highly successful Locky and Bart ransomware campaigns have returned with a new creation: A malicious file-encrypting program called Jaff that asks victims for payments of around $3,700.Like Locky and Bart, Jaff is distributed via malicious spam emails sent by the Necurs botnet, according to researchers from Malwarebytes. Necurs first appeared in 2012 and is one of the largest and longest-running botnets around today.According to an April analysis by researchers from IBM