Konstantin Teplyakov and Alexander Filinov were part of a group called Shaltai-Boltai -- Russian for "Humpty Dumpty" -- believed to be behind high-profile hacks, including into the Twitter account of Prime Minister Dmitry Medvedev.
They were found guilty of "gaining unlawful access to computer information" after a closed trial classified as "secret", the Moscow city court said in a statement.
Among those Shaltai-Boltai were accused of targeting were lead Kremlin propagandist Dmitry Kiselyov and presidential advisor Andrei Belousov.
The group was initially portrayed as an anti-Kremlin collective, with its eye-catching leaks of official emails leaving the authorities red-faced.
But alleged members of the secretive collective have told media outlets that they made money by selling the hacked data to the highest bidder.
Group leader Vladimir Anikeyev was jailed for two years in July after admitting his guilt and agreeing to cooperate with the authorities.
There has, however, been no confirmation that the arrests were connected.
Russian hackers are currently in the spotlight over allegations that Moscow was behind cyberattacks aimed at getting Donald Trump elected as US president last year.
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