ORIGINAL: fbastos
I'm no network specialist, but I thought that when you buy a domain like "citibank.com", then you would have control over the DNS entries on that domain (like a.citibank.com, xyz.citibank.com, gugu.gaga.citibank.com, etc...).
Unfortunately, this isn't always how it words. Depending on the variation, each can be a separate domain purchase, and when you consider how many variations there are, the price tag goes up real fast. I don't know of one company that does this. Now, legally, a company can send a cease-and-desist order to force someone to stop using their name when it will have negative impact on their brand, but, well, try to coerce the scammers in another country... they could care less.
Mostly, surfers just need to be smart. Don't give nobody no access information over the web, especially ATM/bank card stuffs.
I've reported things like this to the Secret Service and Postal Inspectors (oddly, the two groups involved with identity theft here in the US), but I think they're buried with the number coming in.