Just find every instance of require(), check to make sure it isnt requiring some sketchy model. If it is, delete the require. Backdoors RAT your game by requiring modulescripts stored safely away from your game. So check those.
Backdoors can come in Fake Plugins such as “Antivirus” as from random models of the toolbox, it is not safe to use these models since they have Scripts very well hidden inside that could encourage you to play because of the codes they have, as well as take control of the same (They do not steal it, but it will be unplayable)