VERY IMPORTANT

"In summer 2020 we uncovered a previously unknown multi-module C++ toolset used in highly targeted industrial espionage attacks dating back to 2018. Initially the reason for our interest in this malware was its rarity, the obviously targeted nature of the campaign and the fact that there are no obvious similarities with already known campaigns at the level of code, infrastructure or TTPs. To date, we consider this toolset and the actor behind it to be new. The malware authors named the toolset “MT3”; following this abbreviation we have named the toolset “MontysThree”."