Greetings --
This type of spam has become quite common over the past several
months, and unintentionally serves as a valid security "alert." It
demonstrates that you haven't been taking sufficient precautions while
connected to the Internet. Your data probably hasn't been compromised
by these specific advertisements, but if you're open to this exploit,
you may well be open to other threats, such as the Blaster Worm that
recently swept cross the Internet. Install and use a decent,
properly configured firewall. (Merely disabling the messenger
service, as some people recommend, only hides the symptom, and does
little or nothing to truly secure your machine.) And ignoring or just
"putting up with" the security gap represented by these messages is
particularly foolish.
Messenger Service of Windows
http://support.microsoft.com/default.aspx?scid=KB;en-us;168893
Messenger Service Window That Contains an Internet Advertisement
Appears
http://support.microsoft.com/?id=330904
Stopping Advertisements with Messenger Service Titles
http://www.microsoft.com/windowsxp/pro/using/howto/communicate/stopspam.asp
Blocking Ads, Parasites, and Hijackers with a Hosts File
http://www.mvps.org/winhelp2002/hosts.htm
Whichever firewall you decide upon, be sure to ensure UDP ports 135,
137, and 138 and TCP ports 135, 139, and 445 are _all_ blocked. You
may also disable Inbound NetBIOS (NetBIOS over TCP/IP). You'll have to
follow the instructions from firewall's manufacturer for the specific
steps.
You can test your firewall at:
Symantec Security Check
http://security.symantec.com/ssc/vr_main.asp?langid=ie&venid=sym&plfid=23&pkj=GPVHGBYNCJEIMXQKCDT
Security Scan - Sygate Online Services
http://www.sygatetech.com/
Oh, and be especially wary of people who advise you to do nothing
more than disable the messenger service. Disabling the messenger
service, by itself, is a "head in the sand" approach to computer
security. The real problem is _not_ the messenger service pop-ups;
they're actually providing a useful, if annoying, service by acting as
a security alert. The true problem is the unsecured computer, and
you've been advised to merely turn off the warnings. How is this
helpful?
Bruce Chambers
--
Help us help you:
You can have peace. Or you can have freedom. Don't ever count on
having both at once. -- RAH
)