FBI: Russian hackers likely used a simple phishing email on a Yahoo employee to hack 500 million user accounts

The FBI told Ars Technica that a "semi-privileged" Yahoo employee was tricked into giving up information that allowed the hackers to access Yahoo's systems.
Read more: http://www.businessinsider.com/fbi-yahoo-hackers-used-spear-phishing-email-gain-access-500-million-accounts-2017-3?source=Snapzu