I got one the other day ( different scam ) and the mouse overs actually indicated the real site but the scammer was encouraging the opening of an attachment.

The best giveaway is if they don't address you by name.

I got a real on the other day from PayPal about 'you have qualified for business support' but when I went to my PayPal account ( via my own link ) there was absolutely no mention of it.

Turns out it was real but it took the PayPal site about 5 days to catch up...lol

Never use links in emails or open attachments and you will not be robbed. I would say that 99% of users claiming to be 'hacked' have probably fallen for phishing scams.