How can you tell the difference between Blizzard and a hacker on wow

When it comes to whispers in game, Blizzard GMs will have a Blizzard Icon next to their name. They will also have a separate box pop up to talk to them. Hackers will try to get various names that are variations on the words "Blizzard", "Accountadmin" or someother official sounding word like those. The easiest way to tell is if they do not have the Blizzarc icon next to their name, they are NOT Blizzard Employees.