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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 Unpublished notes.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

Beagle Worm

Beagle is a mass-mailing worm that will only work until 28th of January. This worm will insert several files and registry keys on the system. It will also access remote websites, and email all contacts it can find. The emails sent by this worm will have the following characteristics:

Subject: Hi
Message:
Test =)
<Random characters>
--
Test, yep.
Filename: <Random>.exe
Filesize: 16Kbytes
 

Also Known As: I-Worm.Bagle [Kaspersky], WORM_BAGLE.A [Trend]
 
Type: Worm
Infection Length: 16 Kbytes
 
 
 
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
Systems Not Affected: DOS, Linux, Macintosh, Microsoft IIS, OS/2, UNIX, Windows 3.x
 
 
 
  • Virus Definitions (Intelligent Updater) *
  • January 18, 2004

  • Virus Definitions (LiveUpdate™) **
  • January 18, 2004

    *

    Intelligent Updater definitions are released daily, but require manual download and installation.
    Click here to download manually.

    **

    LiveUpdate virus definitions are usually released every Wednesday.
    Click here for instructions on using LiveUpdate.

    Wild:

    Threat Metrics

    Damage

    Distribution


    When W32.Beagle.A@mm is executed, it will do the following.
     

    1. Check if the date on the system is later then Jan 28th, 2004. If so, do not do anything.

       
    2. Insert the file %system%\bbeagle.exe
       

      Note: %System% is a variable. The worm locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).


       

    3. Launch calc.exe.

       
    4. Create the following registry keys:

      HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run, "d3update.exe" = "%system%\bbeagle.exe"
      HKEY_CURRENT_USER\Software\Windows98, "uid" = "[Random Value]"
      HKEY_CURRENT_USER\Software\Windows98, "frun" = "1"

       
    5. Scan the system for all files with the extensions .wab, .txt, .htm and .html. Find email addresses in these files, and email the worm to all found contacts. The email will have the following characteristics:

      Subject: Hi

      Message:

      Test =)
      <Random characters>
      --
      Test, yep.

      Filename: <Random>.exe

      Filesize: 16Kbytes
       
    6. Access a website from a static list in the body of the worm. On the website, access a script called 1.php. At the time of writing it was not possible to access any of the scripts, although this can change at any time. It is unclear what exactly the scripts are used for, but it is possible that they are used to track infected users.

    Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

    removal instructions

    The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines:
     

    1. Disable System Restore (Windows Me/XP).
    2. Update the virus definitions.
    3. Delete the value that was added to the registry, and reboot the system.
    4. Run a full system scan and delete all the files detected as W32.Beagle.A@mm.
       

    For specific details on each of these steps, read the following instructions.

    1. Disabling System Restore (Windows Me/XP)
    If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

    Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

    Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

    For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:


    Note: When you are completely finished with the removal procedure, and you are satisfied that the threat has been removed, you should reenable System Restore by following the instructions in the aforementioned documents.



    For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article, "Antivirus Tools Cannot Clean Infected Files in the _Restore Folder," Article ID: Q263455.

    2. Updating the virus definitions
    Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:


    3. Deleting the value from the registry

     


    WARNING: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry," for instructions.


    1. Click Start, and then click Run. (The Run dialog box appears.)

       
    2. Type regedit

      Then click OK. (The Registry Editor opens.)

       
    3. Navigate to the key:

      HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run

       
    4. In the right pane, delete the value:

      "d3update.exe" = "%system%\bbeagle.exe"

       
    5. Exit the Registry Editor and reboot the system.



    4. Scanning for and deleting the infected files:

    1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
    2. Run a full system scan.
    3. If any files are detected as infected with W32.Beagle.A@mm, click Delete.

    Etc

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    Classic books:

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    The Last but not Least


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