"Sensitive" evidence in the case can not be turned over to Concord's lawyers, because that would make it accessible to their clients in Russia - and back in October, Mueller claimed, someone claimed to have hacked Concord's computers and posted evidence previously handed over online "as part of a disinformation campaign aimed (apparently) at discrediting ongoing investigations into Russian interference in the U.S. political system". They have asked the judge not to let Concord distribute the materials electronically to people in Russian Federation.
Mueller does not accuse defense counsel of involvement in the document release, but was adamant in insisting that the government's servers were not breached.
FBI investigators had found no evidence that government servers holding the data had been hacked, according to Mueller's team, pointing instead to a leak on the Russian side. The account has since been removed from Twitter.
"Enjoy the reading!" the account tweeted. He was indicted by the Special Counsel's office in February 2018 for election interference. The webpage containing the files was deactivated "after a request from the government", the filing states.
Mueller alleges that the account that posted the discovery to the online portal can be linked back to Russian Federation.
Mueller's prosecutors said that there was strong evidence to conclude that the leaked information was from his investigation.
The special counsel describes being advised of the issue by Concord's lawyers on the day after HackingRedstone published the link.
The webpage allegedly linked in the tweet is said to have contained "file folders with names and folder structures that are unique to the names and structures of materials. produced by the government in discovery". Also, a database program called "Relativity" was purportedly used to sort and store the filings, for example, suggesting "that the data was not taken from the Special Counsel's Office or the U.S. Attorney's Office, because the government has not used Relativity databases to store data related to this case".
Eric Dubelier, an attorney for Concord, has argued in filings that he needs to share the sensitive information with Concord employees, like Prigozhin, in order to mount an effective defense.
The special counsel disclosed the apparent online leak as part of its argument against allowing Concord's American attorneys to share sensitive information with individuals in Russian Federation, including Prigozhin, as the attorneys have requested.
They cite a Twitter account that surfaced in October 2016 purporting to have a stolen copy of evidence provided to the company. Mueller's team also argued that the information would fall into the hands of Yevgeniy Prigozhin, an ally of Russian President Vladimir Putin who has been nicknamed "Putin's chef" because his catering company Concord Catering provides meals for the Kremlin. He has been hit with United States sanctions over Russian interference in the 2016 election and is charged alongside his company in the indictment brought by Mueller.