A quick search doesn't give great news unfortunately:
The bad part about this whole story is you cannot be sure you’ll get your files back intact, unless of course you pay the ransom. There is no tool that can handle the crypto as strong as that for the time being.
(per http://malwareprotectioncenter.com/2015/02/06/ctb-locker/ as an example, other places say similar things)
Recovery amounts to:
- backups
- data recovery tools to find the deleted files on disk
- shadow volume backups (Shadow Explorer) / Windows 'previous versions of this file' / etc (as you note, later versions of ctb try to obviate this method)
- previously,
pandaunransom.exe(and similar may have worked), but are unlikely to against newer variants
Hopefully you have backups; if not it is worth trying the shadow volumes (etc) as they may not have been affected, depending on version of ctb-locker.
Edit: I see DavidPostill has linked to a previous question which pretty much says the same thing (Got ransomware and Shadow explorer dont work)