Hot on the heels of my phishing lession from Barclaycard I had a phone call yesterday from my bank. Well I’m pretty sure it was my bank. The guy on the phone said “Hello, this is whoever from Lloyds bank. To confirm your identity could you please give me your date of birth and your online banking password?”. The point is that he called me; he could have been anyone. The only credential he offered was that he knew who I banked with; not hard to find out. In fact I’ve just told you all that it’s Lloyds…
I explained to him that I had no way of knowing that he was who he claimed to be and - after a pause - he came back with some details from my bank account that presumably would only be known to me and the bank. At this stage I should have teased him: “Thanks for that; when Andy gets back I’ll let him know you’ve just divulged confidential details about his account to me”. I didn’t but if they call again I think I will - I feel obliged to find out what kind of reaction that produces.
You’d think the people who design these procedures for the banks would have enough security savvy not to actively encourage people to fall for such simple social engineering tricks though, wouldn’t you? I have to admit that I only just managed to stop myself from giving him my details without authenticating him - and I actually know a bit about this stuff.
I suppose the full exploit works like this: phone someone up posing as a marketeer and say “May I ask who you currently bank with?”. Make a note of their reply and then pretend to get cut off or follow up with some fake marketing guff. Then some time later phone up again and say “Hello, it’s Conman here from <insert name of bank recovered at stage one>. Before I continue please verify your identity by giving me your password”. That’s it - you now have all the information you need to take control of their account.