While WPA encryption stops the (so far) theoretical virus vector in its wireless tracks, the researchers note that the older but still common (or prevalent) WEP only slows its progress. Unsecured routers and those retaining their factory-installed passwords actually help it spread.
Within 24-48 hours of such an attack on a wireless-dense urban are, up to 55 percent of the area's overlapping routers could be infected, the researchers said.
This one's still theoretical, but I wouldn't bet on it remaining that way for long. And even if it does, no excuse for not covering your own business's wireless tracks with WPA-certified devices.