Nothing exactly new here
It is mostly the same method discussed here ( http://www.theregister.co.uk/2010/01/27/3d-insecure/ ) a few weeks ago, concerning the 3d authentication system used in VISA credit cards, the main difference being that the method used for breaking 3d secure works either with a trojan or with a browser vulnerability and/or some phishing.
And I agree with Lord Lien that installing add-ons from non official sources is suicidal. I know players who have fallen for this kind of scams SEVERAL TIMES, which should award them a mandatory in-game title, something like 'Playerxx, The Noob'. :-)
Paris, because I would never allow her to touch my hammer without wearing heavy protective gear. Funny enough, in this case a 'trojan' may prevent you from being infected by viruses. :-D