Philosopher - 3:38 pm on Jan 12, 2010 (gmt 0)

a footprint which can and should be blocked by the bank

Wrong...these apps would never hit the bank, therefore there is nothing the banks can do except warn their customers against using them.

Similar to a regular phishing page, the apps would simply be setup to look like their bank. Once people enter their login information, the apps would most likely just give them a msg along the lines of "sorry, can't access mobile banking at this time...please try again later" or similar.