Stunning new details about the HBO hack have revealed seven times the amount of data stolen in the infamous Sony attack of 2014 was potentially exposed.

It was reported hackers broke into the cable company's servers earlier this week and made off with a script for this week's Game of Thrones episode, as well as unreleased episodes of Ballers, Room 104, and Insecure.

The show Barry, a comedy not set to hit screens until 2018, also had two episodes stolen.

It has now been reported the hackers who boasted about the attack went by the name 'little.finger66' - a reference to one of the characters in Game of Thrones.

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New details about the HBO hack, which saw the script for this week's Game of Thrones published online, suggest the attack could dwarf the infamous Sony breach in 2014. Pictured is a still from Game of Thrones

The hackers reportedly gained access to Game of Thrones and other programs, while also potentially exposing personal details about a top HBO executive

Further new details, published by Variety, indicate the hack could have gone much deeper than originally thought, and that information regarding a top HBO executive could have been be exposed.

Variety's report said that hackers published stolen information about the executive, including: 'information to dozens of online accounts, including paid newspaper subscriptions, online banking, and personal health services'.

The report then states: 'at least one of these accounts may also have given the hackers access to the executive’s work email'.

On Wednesday CEO Richard Plepler attempted to reassure concerned staff, saying 'we do not believe that our e-mail system as a whole has been compromised'.

However, he was not able to provide concrete assurances, adding that 'a forensic review is ongoing'.

An outside credit monitoring service is also being brought in to monitor staff bank accounts, he said, amid fears that confidential details may have been stolen.

Variety's report goes on to cite a 'image file published as part of the leaks', saying it backs up the hackers initial claims that they stole 1.5 terabytes of data from the company.

If the figure of 1.5 terabytes, which is 1,500 gigabytes, it would dwarf the about 200 gigabytes of data was released online from the Sony hack.

The report added a security firm brought in by HBO to scrub the internet of the stolen files believes the hackers took 'masses of copyrighted items including... images, videos and sound' and 'thousands of internal company documents'.

Episodes of the HBO show Ballers, starring Dwayne 'The Rock' Johnson, were reportedly taken in the hack

An episode of Room 104, starring James Van Der Beek (pictured), was also said to have been leaked

That news, and the potential danger to a top executive, was not the only information about the hack published on Wednesday.

Another report, published by the Hollywood Reporter, went into alleged details regarding the sophistication of the attack.

In a mass email to his employees, CEO Richard Pepler (pictured) announced earlier this week some of the network's programming was also stolen

THR cited industry insiders who claimed the hack was about 'targeting specific content and data housed in different locations', which would suggest there were 'multiple points of entry'.

The magazine claims in the update that the lack of any sort of ransom note or demands from the hackers is raising fears that: 'video footage, internal documents or even email correspondence could be leaked'.

Farsight Security CEO Paul Vixie told THR is the 1.5 terabyte figure is true, it could have taken the hackers multiple days to steal all the information.

'A traditional business-grade DSL link would take about two weeks at full blast to exfiltrate that much data,' Vixie told the magazine.

'If not for video and sound, a corporation the size of HBO might fit (entirely) in a terabyte, including all the email and spreadsheets ever written or stored.'

Ajay Arora, CEO of security firm Vera, was equally pessimistic when talking to the Reporter about what was potentially stolen.

'The entire Library of Congress is estimated to contain 10 terabytes of print content,' Arora said.

The data stolen from HBO could be at least seven times more than was stolen from Sony in 2014. Pictured are then-Co-Chair of Sony Pictures Entertainment Amy Pascal and chief executive officer of Sony Entertainment Michael Lynton, both of whom had their emails released in the attack

'As such, it's hard to believe that video and/or audio are not part of what was stolen. It will be interesting - and terrifying to HBO and their parent, Time Warner - to see what comes out.

The new information comes two days after details about the major hack were first reported by Entertainment Weekly on Monday.

HBO immediately consulted with law enforcement and cybersecurity firms to figure out the most effective and appropriate ways to handle the matter and possibly reprimand anyone found involved.

In a mass email to his employees, CEO Richard Pepler announced some of the network's programming was also stolen.

'Any intrusion of this nature is obviously disruptive, unsettling, and disturbing for all of us,' Pepler wrote in his email.

'I can assure you that senior leadership and our extraordinary technology team, along with outside experts, are working round the clock to protect our collective interests.

'The efforts across multiple departments have been nothing short of herculean.'

Pepler said he feels strongly HBO will get to the bottom of the breach with the efforts and teamwork of the company as a whole.

'The problem before us is unfortunately all too familiar in the world we now find ourselves a part of.

'As has been the case with any challenge we have ever faced, I have absolutely no doubt that we will navigate our way through this successfully.'