Certainly from a theoretical point of view, these conclusions are logical, and reasonably convincing. However, the world of computer and mobile malware, just like those who use computers and mobile devices, constantly defies the laws of logic. The likelihood of a user receiving and launching Cabir is equal to the likelihood of a user accepting and launching a file sent via email from an unknown sender. And yes, the file will be launched. The global worm epidemics of the past few years - Mydoom, NetSky, Sober - are evidence of this. Antivirus companies never tire of repeating Dont launch a file sent to you by mail without scanning it first. But this doesnt seem to have had much effect - human curiosity, and a disregard for basic security always win out.
