The 2014 Yahoo hack disclosed late last year that compromised over 500 million Yahoo user accounts was believed to be carried out by a state-sponsored hacking group.
Now, two Russian intelligence officers and two criminal hackers have been charged by the US government in connection with the 2014 Yahoo hack that compromised about 500 million Yahoo user accounts, the Department of Justice announced Wednesday.
According to the prosecutors, at least 30 million accounts were accessed as part of a spam campaign to access the email contents of thousands of people, including journalists, government officials, and technology company employees.
http://thehackernews.com/2017/03/yahoo-russian-hacker.html