Rust is just a tool, so it's no surprise it will be used by Dark Side too. But there is almost no info about the trojan on the page, so it's difficult to know if it really exists at all (this could also be a marketing attempt - not saying it is, just that we don't know).
If it doesn't have any self-replication code, then how can did DrWeb get a copy? Did somebody drop in on a Tor hacking forum, or is it being distributed through a separate system, or did they just make it up for marketing, or what?
(The last point is not to discount the plausibility of this. If malware authors are using Lua nowadays, Rust is nothing to them.)
