Possible Intrusion Attempt?

From: Matt LaFelero (ramstrykeat_private)
Date: Wed May 21 2003 - 16:48:00 PDT

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    I'm hoping someone here might be able to shed some light on this 
    situation..  
    
    Some of my users have been getting some interesting spam mail.  This is 
    the first time I've ever seen a spam mail do this.  When the user opens 
    the spam mail, all of a sudden, an Internet Explorer authentication 
    boxes pops up.  You know those that ask for username, password, and 
    domain.  
    
    Well, I run MS Proxy 2.0 here and the logon with a 2KPro machine is 
    integrated so the user never sees this box or has to enter his/her 
    password to get on the Web.  
    
    It's strange that this email triggers the authentication box.  What's 
    even weirder is that it populates the username for them, with weird 
    names.  The names always seem to change from spam mail to spam mail.  I've 
    seen iterations like fluff, skank, morton, taxiway.. you name it.
    
    It seems most of the emails are HTML, which can explain a lot.  None of 
    them had attachments.  From what I could gather it seems to attempting to 
    load a site.  We run Outlook 2000 with SP3 and all hotfixes.
    
    My question is, how is this happening and is it a threat?
    
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