The hackers, according to EW, also got their hands on an upcoming episode of "Ballers" and "Room 104", which have been placed online.
On 2 August, Hack Read reported that a file on the WinterLeak website called "Viviane Passwords" contained data that may be associated to HBO's vice president of legal affairs Viviane Eisenberg.
While Game of Thrones has been reaching record numbers of people, HBO has been struggling to contain leaks after suffering a major cyber attack over the weekend.
CEO Richard Plepler has that said some of the stolen material included some of HBO's programming, though he has not identified which programming.
Hackers breached HBO's systems on Monday and threatened to return for more.
Key Jeremy Corbyn ally criticises USA for imposing sanctions on Venezuela
Labour leader, Jeremy Corbyn, has faced pressure from some MPs to condemn President Nicolas Maduro, after voicing his support in the past.
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Americans urged to leave North Korea before travel ban begins
He said Beijing has been "very clear with us" that it shares Washington's objectives in denuclearizing the Korean peninsula. The country claimed that the last warhead it tested could be attached to a rocket.
"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", the letter concluded.
Slashfilm reports that HBO is now working with the Federal Bureau of Investigation and cybersecurity firm Mandiant to investigate the stolen data, which is now thought to be even larger than the 1.5 terabytes and contain employee emails as well as more TV episodes and scripts. "Data protection is a top priority at HBO, and we take seriously our responsibility to protect the data we hold". Even if the hackers only obtained 1.5 terabytes of data, that's still roughly seven times as much from 2014's infamous Sony hack. The greatest leak of cyber space era is happening. Enjoy it & spread the words.
In April, a hacker penetrated Netflix to release episodes from season 5 of Orange Is the New Black and, in May, hackers claimed to have stolen Pirates of the Caribbean: Dead Men Tell No Tales.
It's not the first time TV executives have had to fight "Game of Thrones" footage from leaking - in 2015, the first four episodes of season five were illegally distributed online before the series, which stars Kit Harington and Emilia Clarke, premiered. HBO has since halted the practice of sending any episodes in advance.