Our analysis of all these different APT operations indicated an unique use of languages, that offer clues regarding some of the people behind these operations. If the comments in the Flame C&C were written in English, artifacts in RedOctober indicated Russian speakers, NetTraveler indicated Chinese natives. Finally, Kimsuky indicated Korean speaking authors, which we linked to North Korea.
During the past months we have been busy analysing yet another sophisticated cyberespionage operation which has been going on at least since 2007, infecting victims in 27 countries. We deemed this operation "The Mask" for reasons to be explained later.
The "Mask" is leveraging high-end exploits, an extremely sophisticated malware which includes a bootkit and rootkit, Mac and Linux versions and a customized attack against Kaspersky products. This is putting them above Duqu in terms of sophistication, making it one of the most advanced threats at the moment.
Most interesting, the authors appears to be native in yet another language which has been observed very rarely in APT attacks.