An increased level of e-mails are being detected as being infected with the Worm.SomeFool.Gen-1 virus. The virus is more than often attached as "somename.pif"...

The subject of the infected mail may vary. These are some examples:

"Re: Re: Thanks!"
"Re: Word file"
"Re: Your website"
"Re: Your music"

Variants of this virus detected by Gen-1 include NetSky.D.

In any case, you should never open .pif files attached to an e-mail!

PIF files, short for Program InFormation, are a type of file that holds information about how Windows should run a non-Windows application. For example, a PIF file can contain instructions for executing a DOS application in the Windows environment. These instructions can include the amount of memory to use, the path to the executable file, and what type of window to use.