Passing on this message. This is a nasty one.
Quick warning:Users should beware of receiving an email entitled "Outlook
Express Update" carrying file "mmsn_offline.htm".
This virus is rare--but spreading fast.
Kind regards,
grasshopper


GIGGER VIRUS
 Virus researchers have discovered a potentially dangerous new virus that
deletes all files on an infected computer and also formats the machine's C:
drive.

 The virus hasn't infected many computers yet, but Symantec Corp. has given
it a High rating for both damage and distribution, meaning the potential for
widespread infections is considerable.

JS.Gigger.A is a mass-mailing worm written in JavaScript and spreads by
mailing itself to all of the addresses in a user's Microsoft Corp. Outlook
address book. The worm is also capable of spreading through mIRC.
 Gigger is also network-aware, so that after it is finished with the machine
it has infected, it searches for any networked or mapped drives and copies
itself to them. The virus arrives in an e-mail carrying the subject line
"Outlook Express Update" and an attachment named
 Mmsn_offline.htm.
 The body of the message is "MSNSoftware Co." Once the virus is executed it
drops several files and modifies the Autoexec.bat file so that the C: drive
will be formatted the next time the machine is restarted.
Gigger then installs a script file to enable it to spread via the mIRC chat
client and creates two registry keys and modifies a third key.
Lastly, it deletes all of the files on the local hard drive. "

 There are removal instructions on Symantech
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