Simple, all you have to do is go to minecraft's main folder "appdata/.minecraft" then enter the "config" folder click on "ModernWarfare.cfg" and go to the bottom. You'll see entity zombie or bandit1 or that type of text. Nice, just put 0.0 in spawn instead of 1.0. Or if you can't i'll leave my config file for you. And no, there's no virus. Literally how can i put virus on a cfg. Even if i could, what am i gonna use your information for? Anyways, have fun.

config file:
https://www.mediafire.com/file/2o8tx2s402171sr/ModernWarfare.cfg/file
Vic's ModernWarfare mod: https://www.curseforge.com/minecraft/mc-mods/vics-modern-warfare-mod
(i know vic already stated it but wanted to share anyway)