GM hacked?

That very well might mean that ecko was already in control of the account when the GM character did that.

There is no guarantee that this is Ecko. People often use notorious names both to divert attention from themselves and to impart fear onto the people who know of that persons... accomplishments.

This could get very interesting. It's entirely possible that Nexon will take this seriously enough to attempt to pin all of the recent account attacks on whoever did this.