That's called ESP, that's vc hook 5.0.
vc hook 5.0 has multiple options, including an aimbot.
Edit: So, people who only gives headshots on protected servers probably have vc hook 5.0, or are just reallly skilled
People who only have wallhack probably have 4.0.
But both aren't public as far as I know.
Vc hook 6.0 doesn't exist (yet). (I think)