atomic-red-team VS BLUESPAWN

You can write your own or look at testing tools like Cytest to ensure that your business goals are met and to ensure your sensors are configured correctly, and ART for attack chains.

I had heard that Falcon Overwatch has a detection for Exfiltration for C2, but I was not able to trigger it using my personal Kali Machine to host a C2 server with https://github.com/cedowens/SimpleC2_Server and then used Atomic Red Team: https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1041/T1041.md

Yup what the above said, you can use atomic red https://github.com/redcanaryco/atomic-red-team

Atomic red team have tests that should trigger it, it also has a clear description of what it does and how to clean up afterwards. https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1059.001/T1059.001.md suggest that you try obfuscation or cradle.

Dated but still full of goodness. https://github.com/redcanaryco/atomic-red-team/tree/e88a1ea463964839e267dba74ec1cf7bf634ccbf/ARTifacts/Initial_Access

Are you familiar with Atomic Red Team? Many quick & practical sample tests you can often run without much effort or prep work. All tests map to Techniques - a quick way to search through them all at the Tactic level is by searching within the CSV index of all their current tests here (I counted ~50 Collection-related tests just now): https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/Indexes/Indexes-CSV/index.csv

Check out Atomic Red Team’s Redcanary.

I do a lot of work on an open source anti-virus project (https://github.com/ION28/BLUESPAWN), and we're always looking for new contributors. It's been a great learning experience! Not sure if you need to build something from scratch or not, though.