Forensic studies of “Russian hacking” into Democratic National Committee computers last year reveal that on July 5, 2016, data was leaked (not hacked) by a person with physical access to DNC computer. After examining metadata from the “Guccifer 2.0” July 5, 2016 intrusion into the DNC server, independent cyber investigators have concluded that an insider copied DNC data onto an external storage device.
https://consortiumnews.com/2017/07/24/intel-vets-challenge-russia-hack-evidence/