Suspiscious whisper from [Blizzard]

I was playing in game a few minutes ago and got this strange whisper. It is written in broken English and is trying to lure me to a website to validate my account. If this message is a scam how were they able to hack the system to have the name as [Blizzard] ? Isn't that name protected?

Screenshot:
[Removed]

Here is a transcript:

Q u o t e:

Dear players, your account is complaints by other players, please visit account information site validate your information, or else will stop using your account's rights in one hour. warcraft validate site: [Removed]