Tons of 1.txt messages

[Jason.Burzenski at AMERICANHM.COM]

We are suddenly (within the past hour) seeing dozens of reports from
users about messages coming in with an attachment 1.txt (wich is 80b and
empty).  There is always a 1 in the body and nothing else.  The source
address is always forged and most of them seem to be coming from large
ISP user IP pools. 

Here is a sample header:

Received: from x.americanhm.com (sams2.americanhm.com [x.x.x.x]) by
x.americanhm.com with SMTP (x)
        id PKVMXV6N; Fri, 22 Jul 2005 13:53:18 -0400
Received: from betru.net (frnk-d9b96a96.pool.mediaWays.net
[217.185.106.150])
        by x.americanhm.com (8.12.10/8.12.10) with SMTP id j6MHmr22028595
        for <mg at americanhm.com>; Fri, 22 Jul 2005 13:48:55 -0400
Date: Fri, 22 Jul 2005 19:59:41 +0100
To: "Mg" <mg at americanhm.com>
From: "Mg" <mg at ales.com.ec>
Subject: 1
Message-ID: <tmzgclxpkjdscxevsvp at americanhm.com>
MIME-Version: 1.0
Content-Type: multipart/mixed;
        boundary="--------elrddgzjoshelqmabgkc"
X-SAMS-Information: Please contact the ISP for more information
X-SAMS: Found to be clean
X-SAMS-SpamCheck: not spam, SpamAssassin (score=-4.48, required 4.4,
        BAYES_00 -4.90, HTML_MESSAGE 0.10, MIME_HTML_ONLY 0.32)
X-MailScanner-From: mg at ales.com.ec

----------elrddgzjoshelqmabgkc
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: 7bit

----------elrddgzjoshelqmabgkc
Content-Type: application/octet-stream; name="1.txt"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="1.txt"

----------elrddgzjoshelqmabgkc--


------------------------ MailScanner list ------------------------
To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
'leave mailscanner' in the body of the email.
Before posting, read the Wiki (http://wiki.mailscanner.info/)
and the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).

Support MailScanner development - buy the book off the website!