Nostalrius Begins - Quality wow vanilla realm (1.12)

I was corpse running to get Mallet of Zul'Farrak, logged out of my account, moments later, I logged in again, got disconnected and when I checked I was banned. Why? Is it bannable?

What do you mean you were "Corpse Running"?
Were you dead and just running back to your corpse? Or were you using an exploit while being dead?

If the former then no, that shouldn't be why you were banned, if the latter well then yes, that would explain why you were banned.

If that is not the case however what else were you doing at the time? Perhaps you were doing something against the server rules, that was not related to corpse running?

Well, I had no one to help me with the elites from Jintha'alor, so I corpse runned through, that's it.

You probably locked yourself out if you try to login too many times in a row. Wait about 30 minutes and try to login again.

No, I'm actually permabanned.

What? Like, there's anything on the logs? Anyways, thank you.

Notice the word "detected". That's would strongly imply that they do in fact have logs of the hack that you were running. Otherwise how would they even pick you out of the thousands of other people playing here for a ban?

But how they detected hack If I wasn't using hacks... -_-

Unless you were experiencing some sort of weird bug, they aren't going to get a false positive from the warden.