System imaging
https://countuponsecurity.com/2017/04/12/intro-to-linux-forensics/
https://opensource.com/article/18/4/linux-filesystem-forensics
https://tho-le.medium.com/linux-forensics-some-useful-artifacts-74497dca1ab2
https://www.sandflysecurity.com/blog/compromised-linux-cheat-sheet/