APT 40 and 31 are well documented [1] [2]. [1] https://www.fireeye.com/blog/threat-research/2019/03/apt40-examining-a-china-nexus-espionage-actor.html https://

APT 40 and 31 are well documented [1] [2]. [1] https://www.fireeye.com/blog/threat-research/2019/03/apt40-examining-a-china-nexus-espionage-actor.html https://www.fireeye.com/blog/threat-research/2019/03/apt40-e... [2] https://research.checkpoint.com/2021/the-story-of-jian/ https://research.checkpoint.com/2021/the-story-of-jian/