The hackers who compromised HBO's systems leaked a few episodes of shows like Ballers and even the script for next week's Game of Thrones episode.
In a video directed to HBO CEO Richard Plepler, "Mr. Smith" used white text on a black background to threaten further disclosures if HBO doesn't pay up.
"HBO was one of our hard targets to deal with but we succeeded (it took about 6 months).' The hackers instructed Mr Plepler to pay a ransom of 'our six-month salary in bitcoin", claiming they earned $15m to $19m from blackmailing other organisations, to prevent further releases.
The letter said HBO was the 17th target for the hacking group and that "only 3 of our past targets refused to pay and were punished very badly and 2 of them collapsed entirely".
The "confidential" files included data on the current season of GoT, including the script summary of episode five, casting reveals and marketing materials.
Despite giving continuous threats of leaking more HBO material on Sunday, the hacker or hackers behind the recent HBO breach did not release any new material.
Numerous more than 50 internal documents in the dump were labeled "confidential", including a spreadsheet of legal claims against the network, job offer letters to several top executives, slides discussing future technology plans and a list of 37,977 emails called "Richard's Contact list", an apparent reference to Plepler. "While it has been reported that a number of emails have been made public, the review to date has not given us a reason to believe that our email system as a whole has been compromised". One document also has a list of personal phone numbers, home addresses and email addresses for all of the season 7 "Game of Thrones" actors.
HBO said in a statement that it believed that further leaks might emerge from the breach and that "the forensic review is ongoing". In that attack, hackers possibly associated with North Korea unearthed thousands of embarrassing emails and released personal information, including salaries and social security numbers, of almost 50,000 current and former Sony employees.