Possibility of an External wallhack/aimbot

I have no idea what software you would use for this.
But my friend made a aimbot that read you screen and when it saw the color he selected it would automatically aim at it, but for it to do the aim part it would have to be exchanging data, that's where 90% of External anti cheats auto ban you.

Colour Aimbot or "Universal Aimbot" as ive seen it called before. Not sure if we have one here but i figured it'd be pretty hard considering they tend to need modified player models to make the colour stand out so the software knows where to change to and that ruins the whole sv_pure 1 thing so you wont be able to play on servers with sv_pure 1, like Competitive servers, but then again im only here for the cheats so maybe someone can shed some more light onto this