Go, Rust, Nim, and Dlang are the "exotic" languages. I can't really see the case for calling either Rust or Go exotic. I thought this was going to be an article about a new language some large threat group cooked up, but it's just a list of incidences where Go was used to rewrite some loader code/etc..
I surely wouldn’t call them exotic, either, but I suppose they’re relative novelties in the context of malware, or journalism about malware.