There's a reasonably high chance this was to target a specific machine, or perhaps a specific organization's set of machines. After that it could probably be sold off once whatever they were using it for was finished.
I doubt we'll ever know the intention unless the ABC's throw us a bone and tell us the results of their investigation (assuming they're not the ones behind it).
Classic example of this being Stuxnet, a worm that exploited four(!) different 0-days and infected hundreds of thousands of computers with the ultimate goal of destroying centrifuges associated with Iran’s nuclear program.
I doubt we'll ever know the intention unless the ABC's throw us a bone and tell us the results of their investigation (assuming they're not the ones behind it).