This is an idea that has been floating around for awhile. I recommended Convert a USB Thumb Drive into a ROBAM. (ROBAM means read-only bootable alternative media.) Now, the ABA is recommending that businesses use a dedicated PC for online banking. This from SANS News Bites Vol. 12 No. 1:
The American Bankers’ Association (ABA) issued guidance to small and mid-sized businesses regarding how to protect themselves from the growing problem of unauthorized Automated Clearing House (ACH) transactions. Of special note is the recommendation that businesses use
a dedicated PC that is never used for email or web browsing to conduct online banking transactions.
My take on this would be to set up a PC with Microsoft’s Steady State, disable any Internet access except to the bank’s online application and uninstall Outlook Express. I would make a completely locked down and hardened installation of Windows with all services disabled except for essentials. Assign a static IP address to the machine. I would use a software firewall and disable all ports except 80 and 443. Of course, anti-malware software would be essential.
Make the machine so difficult to p0wn that the bad guys give up. It can be done.