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A persistent question is how Mueller’s team got the information detailed in the indictment. As Alexei Venediktov, editor of Ekho Moskvy (Echo of Moscow) radio, noted: “When you read parts of the indictment you just freak out. Because they [Mueller’s team] know everything—time, place, login, password, career. And this supposedly just by remote methods.” As Venediktov and others say, the FBI must have had insider information.
Where did the leak come from? Putin obviously wants to know. When he spoke at a news conference with Trump in Helsinki on July 16, he suggested that Russia and the U.S. cooperate in the investigation by having members of Mueller’s team come to Russia and take part in questioning the GRU officers. (As The Daily Beast reported, this is not nearly as generous as it sounds. When British investigators looking into the murder of former Russian agent Alexander Litvinenko went to Moscow, they found themselves thwarted and put under surveillance.)
Although it is the job of the FSB, as a counterintelligence agency, to find spies and potential traitors within the military, there is some speculation that FSB officers passed information about the GRU’s hacking operations to American intelligence.
Back in December 2016, by which time the GRU had been exposed, some high-level FSB officers in the FSB’s cybersecurity unit were arrested and charged with treason. (One, Sergei Mikhailov, was physically removed from a meeting with a black sack over his head.) The treason case has been kept a closely guarded secret, but Russian insiders suggest that Mikhailov and his colleagues were motivated by the long-standing rivalry between the FSB and the GRU to betray the GRU. According to some sources, money was also a motive.
https://www.thedailybeast.com/this-russian-spy-agency-is-in-the-middle-of-everything