Disney CEO Bob Iger revealed details of the incident last Monday in a Town Hall style meeting with ABC employees, as per Deadline's report. Iger explained that the hackers were demanding a ransom and would release increments of the movie online if their demands remained unmet.
Iger declined to reveal which movie it was that had been stolen. The film in question is Pirates of the Caribbean: Dead Men Tell No Tales according to Deadline.
The payments are being demanded made via bitcoin and although Disney has not confirmed their stance, it seems that the company is refusing to pay.
Pirates of the Caribbean: Dead Men Tell No Tales releases May 26