How the Kaseya VSA Zero Day Exploit Worked

https://blog.truesec.com/2021/07/06/kaseya-vsa-zero-day-exploit/

https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/diving-deeper-into-the-kaseya-vsa-attack-revil-returns-and-other-hackers-are-riding-their-coattails/