Going where no virus has gone before

A computer virus has infected computers on the International Space Station. The virus, Gammima.AG, however hasn't infected the main life support systems or ejected the crew into space but rather 2 laptops belonging to the crew. NASA are investigating how it got aboard but the thinking it may have been on a USB drive taken up by one of the astronauts. Computers on the ISS are not directly connected to the internet so the virus, a password swiper, won't be able to send any captured passwords back to it's master's den. Yet anyway.