Called Netsky-D, this new worm started showing up in inboxes on Monday.

Some of the Subject headings include "Re: Your document", "Re: details", or "Re: here is the document."

The body of the message might say "Please have a look at the attached file." and includes a text file or a pif file (program information file) as an attachment. "It is already extremely widespread," said Graham Cluley, senior consultant at Sophos