The whole part with it being tracked back to a site for G/T kids makes it sound like this was a young person somewhere in the range between "script kiddie" and

The whole part with it being tracked back to a site for G/T kids makes it sound like this was a young person somewhere in the range between "script kiddie" and "beginner hacker", so "rookie" sounds about right. Bored teen or twentysomething with time to kill and an interest in computers.