Do you search the IDEX exchange directly on Google?
Both the first and second places for Google search solutions are phishing links, though both eventually point to the real IDEX exchange.
He might have been click the 1st and second, that is why he got hacked. My friend was recently at your own shoes but when I asked him what did he do- he answered I search it from google and I laughed at him saying it was a phishing site he had clicked. Be careful out there when searching- always triple check or more than that when clicking sites you want to go with. This is money we are talking and we can't lose our wits about it.