Malware over Wireless

Hi, I read a post on a forum somewhere about a guy who set up a wireless AP that was isolated from his network and had the thing set to broadcast malware to anyhow who connected to it. I know my neighbors have been stealing my wireless (I have had reasons for keeping it unsecured although I can now secure it again). Since it is illegal for them to connect to my network, would it be legal to distribute malware? I would think that I have plausible deniablity as to if I intentionally infected them. Just wondering if I can do this...