If you would like to go beyond the HTB machines listed, there are additional paid for trainings and labs listed towards the end of this post as well.
HTB Machines List
- Three

- Bucket

- Sink

- Stacked

- CloudFall (Enterprise Only)

HTB Cloud Track

- SteamCloud
- Bucket
- Worker
- Monteverde
- Epsilon
- Gobox
- Unobtainium

Additional Resources
Some of these are behind additional Paywalls and level access.
HTB Advanced Labs Fortresses AWS

BLACKSKY: Cloud Labs Hailstorm

https://www.hackthebox.com/business/professional-labs/cloud-labs-blacksky
Other Platform Resources
Tryhackme (Not part of normal subscription)

Pentester Academy

CloudFox (Some free, some paid challanges)
Labs from Hacktricks list
I would recommend bookmarking the hacktricks link below while you go through the HTB machines it will be helpful.
https://cloud.hacktricks.xyz/pentesting-cloud/aws-security
- https://github.com/RhinoSecurityLabs/cloudgoat
- https://github.com/BishopFox/iam-vulnerable
- https://github.com/nccgroup/sadcloud
- https://github.com/bridgecrewio/terragoat
- https://github.com/ine-labs/AWSGoat
- http://flaws.cloud/
- http://flaws2.cloud/
This is the list I've compiled during my learning. If there are machines or labs that are not listed, that you think are a great addition, leave a comment down below.
Happy hacking.
These resources are intended for educational purposes only.