I've seen two terms come up in regards to bitcoin. S+uxnet and T0fsee. They aren't spelled that way.
The first was an operation that was done back years ago where a virus was written to throw off the iranian nuclear program. Even after hours of research that is still fairly mysterious to me as no one really wants to talk about where it came from but it was significant because of the sophistication. It contained a lot of information that would have been very valuable to any sort of "for hire" hacker that might have had that information which means that whomever constructed the program had an agenda that was not fueled by the desire for money. S+uxnet had a single target and that was logic controllers for uranium enrichment centrifuges but the important information is the deployment.
The t0fsee program is very similar but even more mysterious. its another widespread/multifunction program that has cryptocurrency mining capabilities and a very strange piece of code in it that I have yet to see anybody identify. Its a section of code that nobody knows what it does or even what the language is and i've read theories about a tie-in to the backdoors built into most processors these days.
My guess: They are definitely mining and as fast as they can. I also see a lot of room for conspiracy around the tether market. If you aren't into cryptos tether is one that claims to be redeemable 1 for 1 with USD. There is a lot of speculation as to the legality of their operation and whether or not they are even receiving the dollars they claim to be when they release tethers. But tether could basically be a printing press for the NWO currency. Even if the Devasini guy who runs it isn't one of them I'm sure he could easily be persuaded to become one of them.
There is a guy on twitter named Bitfinex'ed who looks into tether all the time and rants about it constantly, but he doesn't come here and has never connected the pieces of his puzzle over to ours. Sorry for the sauceless rant, just trying to point you to what I've seen that seems shady and related.