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Malware Defense History

by Dr. Nikolai Bezroukov.

Copyright: Dr. Nikolai Bezroukov 1994-2013. Unpublished notes. Version 0.80.October, 2013

Contents : Foreword : Ch01 : Ch02 : Ch03  : Ch04 : Ch05 : Ch06 : Ch07 : Ch08 : Ch09 : Ch10 : Ch11 : Ch12 : Ch13

Chapter 6: Mail Worms

The Beagle.K worm sends spoofed messages that threaten to disable user e-mail account

Nikolai N Bezroukov

03/03/2004 03:56 PM

To:  Antivirus_Contacts

Subject: The W32.Beagle.K worm sends spoofed messages from threatening to disable user e-mail account

This variant of Beagle worm polished social engineering trick with the password protected ZIP file in a new (actually old, borrowed form another worm) way: emails pretend to come from one of admin accounts and inform the user about some improper action on his/her part and threatens to disable it.

Here is an example of the message (please note that the icon on the left is a globe; that means that email in not internal, but came from the internet; actually we might benefit from replacing it with something less neutral -- many users do not understand the difference ):

03/03/2004 11:00 AM

To: Joe User


Subject: Notify about your e-mail account utilization. VIRUS WARNING: Executable attachment or Mimail/Mydoom/Netsky/Beagle worm ZIP replaced with a dummy file (GW99)


Hello user of e-mail server,

Your e-mail account will be disabled because of improper using in next

three days, if you are still wishing to use it, please, resign your

account information.

Pay attention on attached file.

Attached file protected with the password for security reasons. Password is 07422.

The Management,

The team


From address is spoofed so that it to appears as though its coming from the one of the following addresses at the BASF domain:

As of 3:30 pm I blocked those addresses on the gateway so we should be OK from that time.

Subject: (One of the following lines)

E-mail account disabling warning.

E-mail account security warning.

Email account utilization warning.

Important notify about your e-mail account.

Notify about using the e-mail account.

Notify about your e-mail account utilization.

Warning about your e-mail account.

The text of the message ius randomly generated but contains phrases that might prompt a user to open the attachment:

Message: (One of the following lines)

Dear user of <domain>,

Dear user of <domain> gateway e-mail server,

Dear user of e-mail server "<domain>",

Hello user of <domain> e-mail server,

Dear user of "<domain>" mailing system,

Dear user, the management of <domain> mailing system wants to let you know that,

Followed by one of the following paragraphs:

Your e-mail account has been temporary disabled because of unauthorized access.

Our main mailing server will be temporary unavaible for next two days,

to continue receiving mail in these days you have to configure our free

auto-forwarding service.

Your e-mail account will be disabled because of improper using in next

three days, if you are still wishing to use it, please, resign your

account information.

We warn you about some attacks on your e-mail account. Your computer may

contain viruses, in order to keep your computer and e-mail account safe,

please, follow the instructions.

Our antivirus software has detected a large ammount of viruses outgoing

from your email account, you may use our free anti-virus tool to clean up

your computer software.

Some of our clients complained about the spam (negative e-mail content)

outgoing from your e-mail account. Probably, you have been infected by

a proxy-relay trojan server. In order to keep your computer safe,

follow the instructions.


Followed by one of the following lines:

For more information see the attached file.

Further details can be obtained from attached file.

Advanced details can be found in attached file.

For details see the attach.

For details see the attached file.

For further details see the attach.

Please, read the attach for further details.

Pay attention on attached file.


Followed by:

The <domain> team http://www.<domain>

Followed by one of the following lines:

The Management,


Best wishes,

Have a good day,


Kind regards,

If the attachment is a zip file, the message will include one of the following lines:

For security reasons attached file is password protected. The password is "<password>".

For security purposes the attached file is password protected. Password is "<password>".

Attached file protected with the password for security reasons. Password is <password>.

In order to read the attach you have to use the following password: <password>.

Attachment is a zip file that contains a randomly named .exe file. The zip file is password-protected.



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