The Resource Kit is Cobalt Strike’s means to change the HTA, PowerShell, Python, VBA, and VBS script templates Cobalt Strike uses in its workflows. The Resource Kit is part of the Arsenal Kit, which contains a collection of kits and is available to licensed users in the Cobalt Strike arsenal. Go to Help -> Arsenal to download the Arsenal Kit.
The README.md supplied with the Resource Kit documents the included scripts and which features use them. To evade a product, consider changing strings or behaviors in these scripts.
To make Cobalt Strike use your script templates over the built-in script templates, load either the dist/arsenal_kit.cna or dist/resource/resources.cna script. See the Arsenal Kit README.md file for more information.