Interesting. Malicious. None the less, interesting. Sadly Hak5 is no longer distributed over torrents, not that we'd want to have any part in zombied machines seeding, but again, interesting.
So what's to stop you from doing something similar except with folding@home, or rainbow table generation, or even better, just simply add the machines idle resources to a cluster. Of course bandwidth would be a limitation but imagine having a "Evil Hak5 Cluster for Goodness"....."wait, where does the evil come in?"