Ransomware continues to be a highly destructive threat to information resources.  Design innovation continues as documented by the SANS Internet Storm Center and Phishme security sites
https://isc.sans.edu/forums/diary/Bart+a+new+Ransomware/21195/
http://phishme.com/rockloader-downloading-new-ransomware-bart/
Phishme is reporting the discovery of a new ransomware which its creators have named Bart. Bart shares several commonalities with the Locky ransomware.  Bart is delivered by the same downloader, RockLoader.  The payment site bares a striking resemblance to the Locky page.
But Bart also deviates from Locky in other ways.  The ransom is much higher, 3 Bitcoins, approximately $2000.  But probably the most striking difference is that unlike most ransomware variants Bart does not require a command and control to facilitate the encryption and in fact looks like it has no command and control capability.  Bart does not utilize the complex public-private key or symmetric encryption methods that have become common in ransomware.  Instead it stores the encrypted files in password protected zip files, and utilizes a victim id and a tor-based payment website to  facilitate decryption.