ComRAT (aka Chinch) is a complex malware backdoor written in C++, descended from Agent.BTZ, used by the Turla APT group.
https://web-assets.esetstatic.com/wls/2020/05/ESET_Turla_ComRAT.pdf
Linux Persistence: atd
2025-04-01 DFIR CTF linux persistence at atd
Linux Persistence: SSH
2025-03-29 DFIR CTF SSH hardening hunting persistence linux persistence hunting hardening SSH PAM