It was reported on Steemit within hours of hack: NSA Hacked.
Once it was found that contents posted by hacker on Github & Tumblr were taken down, a copy of the same was made on Steem's immutable blockchain: NSA hacked data on Steem's Immutable Blockchain.
RE: The NSA Hacked?! ‘Shadow Brokers’ Claim to be Selling NSA Malware, in What Could Be Historic Hack