APT and Malware

APT and Malware Information Resources

MISP Project

Lots of information on different types of malware, threat actors, etc.

https://www.misp-project.org/galaxy.html

Malwology

Interesting research on malware

https://malwology.com/

Practical Malware Analysis

One of my favorite books on malware. The link is to the sample malware in the book.

https://practicalmalwareanalysis.com/labs/