The internet is getting ever more sophisticated. The problem is that those bad people who are out to rob you via the internet are also getting more sophisticated.
A scam currently doing the rounds - I haven't seen it myself - is a fake email from HM Revenue and Customs. It purports to be offering you a tax rebate ... in exchange for your banking details. By all accounts it is very convincing. And who wouldn't jump at having some income tax back! Seems too good to be true? Well, it is too good to be true! As with your bank if this sort of information is needed they will write to you. So please don't get scammed.