The interesting thing is, everything that she does is completely plausible—it’s the way she does it that is for the most part completely nonsensical as a technical matter.
Well, she chose the right computer (MacBook Pro), the rest is details. Seriously, given what Poulsen says, it may be that it’s only machines running Windows that can be hacked like this. But, in the movie she hacks into Mikael Blomkvist’s MacBook Pro. Is that possible if he doesn’t have file sharing turned on and his computer sits behind a firewall? Curious (Mac using) minds want to know.