Idea

I think it's better to not show any main characters. Just to get the point across and the audience excited. So I would focus on The Idea. Which is cybercrime.

And a teaser that focuses strictly on cybercrime will be better than a teaser that follows a character we don't see or know. A short montage of different problems around the globe would be awesome - stock markets plummeting, street lamps going haywire :), etc - but I don't know how feasible that would be.