Server getting hacked

I have a cracked server with a couple of friends, and out of nowhere mobs start spawning from anywhere, noone else is in the server(at least from what i see), nothing pops up in the console, so they are hacking from a seperate console or smth?, im not sure, but its really making it unplayable. can someone help me

Quote from Roman

spawning mobs is nothing unusual...

I mean like i can see them spawning right in front of me one after another constantly from the same place, i shut down the server after that so idk, was that just a bug or smth

edit: i turned the server just back on and it didnt do it anymore, so i think might just be weird bug

Oh, apparantely it was my friend that was doing it(he claims he did it but idk), but he wasnt on the server at the time it was happening, is this possible or is he just playing me?,

not sure if this will help,

but he isnt opped, i allowed cracked clients(the server), and its 1.12.2 forge, and still nothing shows up on the console screen.

Quote from Roman

In 99% where people say their server got hacked it's just a friend.

yeah im sorry about wasting your time, but i have a question, how did he do it?(what do you think he used?}

Quote from Roman

There are several ways to do that.

What exactly he did depends on which mods etc. you have on your server and which access rights he has.

The best way to find that out is to get him telling you what he did.

well, after a bit of annoyance, he gave in, he said something about disguising commands as packets.

We have Buildcraft, Iron tanks(for BC), galacticraft and it sforge 1.12.2. he has no access rights(not opped or anything at all). so yeah