for some reason i sympathize this team, but really.. if you are so high profile hackers group, why use mostly-legitimate-use vpn service when you can buy:

1) vpn service hosted in the bot net (i.e. on zombies machines)

2) hosting on the bot net (i.e. one you can not stop at all, you can not track it)

These "services" quite possible to buy and they are not really expensive. The only downside is link speed which should be pretty slow keeping in mind that bots are hosted on regular home PC on adsl/cable internet connection..