SQL has encrypted mdf files

SQL has encrypted mdf files

Hi, we were hacked by a very bad virus today. Which my one of my I.T. staff decided to tell me our last backup of the sql databases is 12 days old.
The virus has encrypted the mdf files, but not touched the ldf files. Also our T-log backups are not available but we have a full t-log from the original server.
Is there any way we can take a 12 day old backup of the mdf files and some how bring it up to date by importing the ldf files?

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