W32/Bagle.j@MM

Virus Information
Discovery Date: 03/02/2004
Origin: Unknown
Length: Varies
Type: Virus
SubType: E-mail

-- Update March 2nd 4:38pm PST --
The risk assessment of this threat has been raised to medium due to increased prevalence.

This is a mass-mailing worm with the following characteristics:

contains its own SMTP engine to construct outgoing messages
harvests email addresses from the victim machine
the From: address of messages is spoofed
attachment can be a password-protected zip file, with the password included in the message body.
contains a remote access component (notification is sent to hacker)
copies itself to folders that have the phrase shar in the name (such as common peer-to-peer applications; KaZaa, Bearshare, Limewire, etc)
Mail Propagation

The message-bodies are constructed with several parts, to effectively customize the email, to make it appear to be a legitimate warning notification. The details are as follows:

From : (address is spoofed)
Subject :

E-mail account security warning.
Notify about using the e-mail account.
Warning about your e-mail account.
Important notify about your e-mail account.
Email account utilization warning.
Notify about your e-mail account utilization.
E-mail account disabling warning.
Body Text:

Greeting -

Dear user of (user's domain) ,
Dear user of (user's domain) gateway e-mail server,
Dear user of e-mail server "(user's domain) ",
Hello user of (user's domain) e-mail server,
Dear user of "(user's domain) " mailing system,
Dear user, the management of (user's domain) mailing system wants to let you know that,
(Where the user's domain is chosen from the To: address. For example the user's domain for user@mail.com would be "mail.com")

Main message body -

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.
Attachment explanation -

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.
Password information - (if received as a ZIP file)

For security reasons attached file is password protected. The password is "(five random numbers) ".
For security purposes the attached file is password protected. Password is "(five random numbers) ".
Attached file protected with the password for security reasons. Password is (five random numbers) .
In order to read the attach you have to use the following password: (five random numbers) .
Closing -

The Management,
Sincerely,
Best wishes,
Have a good day,
Cheers,
Kind regards,
The (user's domain) team http://www.(user's domain)

(Where the first part of the closing is selected from the list. The second part is always present.)

Attachment: (May be .EXE .PIF or .ZIP)

Attach
Information
Readme
Document
Info
TextDocument
TextFile
MoreInfo
Message
The virus copies itself into the Windows System directory as IRUN4.EXE. For example:

C:\WINNT\SYSTEM32\IRUN4.EXE
It also creates a file IRUN4.EXEOPEN which may either be another copy of itself or a ZIP file (~13KB) to be sent in email.

The following Registry key is added to hook system startup:

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Run "ssate.exe" = C:\WINNT\SYSTEM32\irun4.exe
Like its predecessors, this worm checks the system date. If it is the 25th of April 2005 or later, the worm simply exits and does not propagate.

The worm uses the following icon, to make it appear that the file is a WordPad document:

http://vil.nai.com/images/101071.gif

This worm attempts to terminate the process of security programs with the the following filenames:

ATUPDATER.EXE
AUPDATE.EXE
AUTODOWN.EXE
AUTOTRACE.EXE
AUTOUPDATE.EXE
AVLTMAIN.EXE
AVPUPD.EXE
AVWUPD32.EXE
AVXQUAR.EXE
CFIAUDIT.EXE
DRWEBUPW.EXE
ICSSUPPNT.EXE
ICSUPP95.EXE
LUALL.EXE
MCUPDATE.EXE
NUPGRADE.EXE
OUTPOST.EXE
UPDATE.EXE
The worm opens port 2745 (TCP) on the victim machine.

http://vil.nai.com/vil/content/v_101071.htm