So after a lot of debating and research I decided to use Go as the backend (aka the C&C) and Rust for the client (AKA the bot). I was gonna use C, but I decided it would be an nice touch to use something new.
Communication between the bots and the C&C will be done through Tor ( I though about using I2P).
I'm open to suggestions if anyone has any. :)

The language doesn't really matter, but I've used puppet and ansible for bot management and it works just fine

As he said ^ the language does not matter as long as it works for you

are you aiming for an IoT botnet or general botnet?

if it's the latter, what if you implement a "mutate" function?
when i was making my own botnet (unfinished), i had the idea of making it partially p2p and take a small load off from the main server.
this is where the "mutate function" idea came from. so the server can send a command to a connected client to tell it to become a server.

i haven't thought this thoroughly on how the code would be written though; but i hope this weird idea can help you in some way.

you could probably do this with IoT, but i have less clue on doing things on no-std.

sorry if this sounds dumb.

jit sneezing my guy?