Full Disclosure mailing list archives

Re: Email


From: Nick FitzGerald <nick () virus-l demon co uk>
Date: Thu, 05 Feb 2004 13:46:31 +1300

D B <geggam692000 () yahoo com> wrote:

I'm by no means a security expert nor do I want to be,
but while I read this list at 3 am my mind wanders and
I wish for someone from experience to explain to me
why any virus can infect any mail server / user  when
those administrating a mail server can make a mail
server handle mail in the manner I pasted a snippet of
from my own in-box.

( obvious designator )
****************snippet****************

This is a multi-part message in MIME format.

------=_NextPart_000_0012_FAA048F2.06F42141
Content-Type: text/plain;
      charset="Windows-1252"
Content-Transfer-Encoding: 7bit

The message cannot be represented in 7-bit ASCII
encoding and has been 
sent as a binary attachment.


------=_NextPart_000_0012_FAA048F2.06F42141
Content-Type: application/octet-stream;
      name="message.pif"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
      filename="message.pif"

TVqQAAMAAAAEAAAA//8AALgAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAqAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

****************snip***************
( end of obvious designator )

You are confusing the effect of a deliberate attempt by the Mydoom 
virus writer to "trick" the recipient of the virus' Emails into opening 
the attachment (and to then, "hopefully", open/execute the contents of 
the .ZIP file) with the actions of a mail server or relay ppresumably 
between the message's sender and its recipient.


-- 
Nick FitzGerald
Computer Virus Consulting Ltd.
Ph/FAX: +64 3 3529854

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