Neither Apple nor Quanta immediately responded to multiple requests for comment.

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At the moment, it’s difficult to say whether the alleged documents REvil has are actually all that important. The designs visible on the leak site look like basic blueprints for a Macbook—and don’t appear to be super “TOP SECRET” stuff. Brett Callow, a threat analyst with security firm Emsisoft, said it’s not necessarily the case that the hackers are telling the truth about the severity of the hack.

“The REvil operators have been responsible for a number of high profile attacks and also some of the highest demands to have become publicly known,” Callow said in an email. “That said, ransomware groups have lied about the strength of their hand in other incidents, so it would be a mistake to assume that REvil has all the data they claim to have and that other parties are interested in buying it.”

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On the other hand, REvil is a prominent ransomware gang—one that has actively sought to foster a fearsome reputation by ruthlessly targeting high-profile companies. The gang recently took responsibility for hacking large electronics firm Acer, demanding a then-record-breaking ransom of $50 million in return for its stolen files.

UPDATE Wednesday, April 21: Quanta has confirmed to Bloomberg that it was hacked, though it declined to share “if or how much of its data was stolen.” Additionally, more screenshots of documents have been published on REvil’s leak site since yesterday’s initial dump. The site now provides a link to downloadable documents, as well.