HBO says it doesn’t want to feed hacker’s desire for publicity, but experts say network may eventually give in after Ballers, Barry and The Deuce also leaked

Hackers have leaked a trove of unaired episodes of HBO’s Curb Your Enthusiasm, Insecure, Ballers, Barry and The Deuce, as they continue to in their efforts to extort the US television network.

The leaks over the weekend did not include any further episodes of Game of Thrones, but did include the latest episode of Insecure, which was due to be broadcast on Sunday evening, and several episodes of the highly anticipated new series of Curb Your Enthusiasm, which is due to return in October.

The attack occurred in July, where hackers claim to have had access to 1.5TB of data – the equivalent to several TV box sets or millions of documents. HBO acknowledged the theft of “proprietary information”, and the demand for a multimillion-dollar ransom, but said it did not believe its email system as a whole has been compromised, despite the leaking of emails, documents and the personal phone numbers and email addresses of Game of Thrones actors.

An HBO spokesperson said that the company was “not in communication with the hacker, and we’re not going to comment every time a new piece of information is released”.

“The hacker may continue to drop bits and pieces of stolen information in an attempt to generate media attention. That’s a game we’re not going to participate in.”

While the effects of the attack on HBO have fallen short of the chaos that hit Sony Pictures in 2014, the hackers have leaked Game of Thrones scripts, sensitive internal documents such as job offer letters and a month’s worth of emails from a programming executive.

Gartner analyst Avivah Litan said that the hackers might be holding on to more sensitive and damaging information and TV shows. She said: “It’s kind of like kidnap and ransom and torture. Eventually HBO may have to give in.”