It is spreading mostly using pen drives as the medium. This virus is know popularly as regsvr.exe virus, or as new folder.exe virus and most people identify this one by seeing autorun.inf file on their pen drives, But trend micro identified it as WORM_DELF.FKZ. I was surprised that my most reliable friend Avast, for the first time failed me in this war against viruses but then again avg and bitdiffender also failed against it. I want to tell you a story, two days back i got affected by this virus very badly as it eat up all my empty hard disk space of around 700 MB 🙁.