It’s not a “hack” of a command and control box that resulted in this leak. It’s almost certainly human intelligence – someone walked out of a secure area with a USB key. Mention of corruption and elections in the text of the release feels classicly Russian. High level US political officals seemed quite upset about the DNC hacks, which no doubt resulted in a covert response, which this is then likely a counter-response to. Someone is sending a message that they know about USG efforts to influence elections and governments via cyber.”]
Source: https://cybersecpolitics.blogspot.com/2016/08/why-eqgrp-leak-is-russia.html