It's not a platform specific hack. It's the concept that's the issue. A slight modification to the payment processing flow that does the dirty work and makes it hard for most etailers to find.
Until you notice, the hackers are collecting the credit card info of your customers. Magento was named but the hack could be applied to any store and likely is. Any hacker that makes money selling CC info would likely have a suite of code blocks for the most popular eComm applications available to use with this hack. The only real challenge is getting in to make the changes.