The leak apparently had seventh season's fifth episode plot details alongside "castings, script summaries and marketing materials" for the popular fantasy drama, according to The Hollywood Reporter.
The material came Monday in an email message to the international publication that also contained nine files with labels-- "Confidential" and "Script GOT7."
"HBO believed that further leaks might emerge from this cyber incident when we confirmed it last week. As we said, the forensic review is ongoing," a representative of HBO said.
The news of hack first broke out on last Tuesday when the hackers reportedly released a handful of unaired episodes of HBO shows, as well as other internal data, online.
More From This Section
The network has acknowledged the hack, but has not yet given out any details about the types of files hackers were able to obtain.
However, according to a spokesperson from HBO, the leak was related to one of HBO's distribution partners, Star India, and had no relation to the hack.