Remote Access Trojans (RATs) can be the beginning of very bad things on your network or workstations.
Remote access trojans (RATs) may not induce the same sort of nightmares as angry cannibal rats, but they can still be terror-inducing if they hit your network and workstations. Because there's nothing like turning control of your resources over to someone you don't know to make the job of IT security completely rat-tastic.