A new version of TeslaCrypt was released on Tuesday that contains some minor changes. The ransom note filenames have been changed to Howto_RESTORE_FILES.txt, Howto.html, and Howto.bmp. The name for the autostart entry in the Windows Registry has changed to Acrndtd.HKCUSoftwareMicrosoftWindows WindowsCurrentVersionRunAcrndtd C:UsersUsers\AppDataRoaming..Exclude.
Source: https://www.bleepingcomputer.com/news/security/new-variant-of-teslacrypt-released-with-minor-changes/