HELK VS DetectionLab

Utilizing that api and juniper notebooks is exactly why Hunting Elk is the way it from my understanding.

So you can actual do both defensive while practicing offensive. If you can set up a lab system with an attacker, for ease using kali, and defensive systems like a single windows box, or you can go balls to the wall if you have the resources and set up an AD environment and then ship all the logs to a SIEM system like Splunk or HELK (https://github.com/Cyb3rWard0g/HELK). Building off the environment you can also include Mordor (https://github.com/UraSecTeam/mordor)

HELK + Mordor combo https://github.com/Cyb3rWard0g/HELK

On a side note - I somehow have the feeling that you are trying to recreate https://github.com/Cyb3rWard0g/HELK

You can find tools that leverage ELK that aren't necessarily plugins. SIEM looks like it has some free component to it, too: https://github.com/Cyb3rWard0g/HELK https://www.elastic.co/blog/elastic-siem-free-open

HELK can help for the SIEM and detection part

Detection Lab Link: https://github.com/clong/DetectionLab

Not sure what your goal with splunk is but I'd recommend Detection lab! Once you get the pre reqs setup, building and tearing down is super easy and you get a pre-baked ad environment to generate logs for you. https://github.com/clong/DetectionLab

I found a great starting point at the repo of DetectionLab : https://github.com/clong/DetectionLab

Detection Lab

Since you mention your in-depth ELK workflow, have you tried DetectionLab or Splunk's Attack Range? If you just want a fully working AD domain set up with various hosts, you can spin up the Red Team Attack Lab and then hook in your own logging stuff after it's built.

I setup automated Chris Longs Detection Lab, to quickly spin up AD environment, AND i took WazeHell's Vulnerable-ad scripts to make the lab vulnerable to all kinds of attacks. Easy and effective lab with a domain controller, 2 servers and a windows 10 client.

https://github.com/clong/DetectionLab for building your own lab