As per the reports, hackers accessed several episodes of Game of Thrones and few other TV shows.
Hackers are demanding a multi million-dollar ransom to halt the release of the entire series, which is filmed in Northern Ireland, and other sensitive files.
'As we said the forensic review is ongoing. To stop the leaks, the purported hackers demanded "our six-month salary in bitcoin", which they implied is at least $6m (€5.1m). Meanwhile, many internal documents marked as "confidential" were also released, divulging job offer letters to several top executives, a spreadsheet of legal disputes against HBO, slides detailing the network's future technology plans and a list of nearly 40,000 emails called "Richard's Contact List".
In that attack, hackers unearthed thousands of embarrassing emails and released personal information, including salaries and social security numbers, of almost 50,000 current and former Sony employees. HBO is apparently the 17th target of this hacker group with only three companies refusing to pay.
HBO's all-too-public hacker nightmare began last week, when the unnamed attackers sent their first notice to reporters, claiming to have a stolen stockpile of the company's secrets. Those documents include data like HBO CEO Richard Plepler's email contact list (with almost 40,000 entries) and a cast list for Game of Thrones that includes actor phone numbers, addresses, and email addresses.
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The "confidential" files included data on the current season of GoT, including the script summary of episode five, casting reveals and marketing materials. Today they made good on that promise, making ransom demands of HBO to halt this trickle release of stolen data.
"The review to date has not given us a reason to believe that our email system as a whole has been compromised", he told the news site.
In the automated email, the cybercriminals reiterate previous claims to have obtained a total of 1.5 terabyte of data from HBO's computer network.
HBO confirmed the data leak but they are not sure what data was leaked.
One week after hackers spilled multiple episodes of unreleased HBO shows and scripts online, the same group has dropped its second trove of purported internal data from the premium network.