A fast-moving email worm that began spreading on Thursday has been able to affect hundreds of thousands of computers worldwide, anti-virus provider Symantec warned.
The email arrives with the subject ?Here you have.? An executable screensaver that's disguised as a PDF document then tries to send the same message to everyone listed in the recipient's address book. The .scr file is a variation of the W32.Imsolk.A@mm worm Symantec discovered last month.