You can see a video made by Roger Thompson of how the Bank of India infection looks to the user.
The vid's a bit rough at the moment, and some of the bits are currently unreadable, but we'll be editing it as we go, so clearer versions will soon be available, but it's still interesting.
Video link here. Nice work, Roger.
It's worth reiterating that fully-patched systems would not have been affected by this hack.