I would suggest part of the concept would be that a lot of things, (data collection, surveillance) would be mostly automated. It could create packages (organized by date) that will upload periodically.
If designed well, it could be designed to operate on a very large scale, with a P2P C&C server. The package idea also would allow for future expansion with air-gaps, offline etc.
I don't want to sound like that guy, but python could be a very good choice. STELF is written in python, and pyinstaller does an extraordinarily good job. Much better than I ever dreamed it to be.
What sort of scale is intended for this project, what would be different about this piece of malware, and how can we creatively incorporate new ideas to this?
I'm excited to see this come to fruition. I hope it does and not just fade away as some projects do