RE: email address "spoofed"

[Jeff McLaughlin <JMclaughlin () springsgov com>]

Someone is sending out email messages (with virus laden attachments)
using our domain name  

> > BagleJ virus.

My question is how is this done

> > virus creates its own SMTP engine and queries for your domain name.

is there anything we can do to prevent this in the future?

> > mitigate this virus at your mail servers / firewall , verify virus
protection.  Stay up to date with newly released viruses and their behavior
and proactively block them

> > create ACLs and Firewall rules that only pass mail (25 smtp) to/from your
mailservers.  This will at least block an infected workstation from
successfully sending mail to another workstation/network other then your
mail server.

.... your configuration may be different ...


-----Original Message-----
From: Tim Laureska [mailto:hometeam () goeaston net] 
Sent: Friday, March 05, 2004 2:59 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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