RE: email address "spoofed"

["Fields, James" <James.Fields () bcbsfl com>]

The virus looks at the email domain of the address to which it is
sending itself.  Example:  it wants to send a copy of itself to
bob () domainX com (which is grabbed from the email address book on the
infected computer).  It just spoofs the sender information with
something like "admin () domainX com" or "support () domainX com" or similar.
I have no idea how you could stop it given how email works today.  Your
best bet is to send your users a legitimate warning about these and what
to watch out for.

-----Original Message-----
From: Tim Laureska [mailto:hometeam () goeaston net] 
Sent: Friday, March 05, 2004 4:59 AM
To: security-basics
Subject: email address "spoofed"


I'm not sure if "spoofing" is the correct term but here is what has
happened:

Someone is sending out email messages (with virus laden attachments)
using our domain name  ... they are addressed as coming from
support () ourdomainname com (ourdomainame would be our actual domain name)
which is an email address that we never set up.

My question is how is this done and is there anything we can do to
prevent this in the future?  The message header looks like this:

Received: from your-xhtr8hvc4p [68.55.1.207] by ourdomainname.com
  (SMTPD32-8.05) id A3C8DF0118; Fri, 05 Mar 2004 04:09:28 -0500
Date: Fri, 05 Mar 2004 04:07:07 -0500
To: info () ourdomainname com
Subject: E-mail account security warning.
From: support () ourdomainname com
Message-ID: <oruybbfoofisdsegtve () ourdomainname com>
MIME-Version: 1.0
Content-Type: multipart/mixed;
        boundary="--------hggfurquvkrsejwodibt"
X-RCPT-TO: <info () ourdomainname com>
Status: U
X-UIDL: 355598192


Tim




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