For those who has not been hacked. Please be careful and change to more complicated pass word. Numbers + Alphabet+ capital+small capital letter.
These are few link for read up:
1)(What to do If you got hacked)  http://sea.battle.net/en/security/help
2)(Types of Theft)  http://sea.battle.net/en/security/theft
3)(Security Checklist) http://sea.battle.net/en/security/checklist
4)(Battle.net Mobile Authenticator FAQ) http://us.battle.net/support/en/article/ba...thenticator-faq
5)Do at least activate Battle.net SMS Protect in your account
(Official Page) http://us.battle.net/d3/en/forum/topic/5149619846?page=1