W32.Dinoxi.B

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Discovered: December 11, 2005
Updated: February 13, 2007 12:49:50 PM
Type: Worm
Systems Affected: Windows


W32.Dinoxi.B is a worm that spreads via AOL instant messenger by sending a link to all available contacts on the user's contact list and opens a back door on the compromised computer.
The worm also spreads through various peer to peer file sharing applications.

Antivirus Protection Dates

  • Initial Rapid Release version December 11, 2005
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version December 11, 2005
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date December 14, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Kaoru Hayashi

Discovered: December 11, 2005
Updated: February 13, 2007 12:49:50 PM
Type: Worm
Systems Affected: Windows


When W32.Dinoxi.B is executed, it performs the following actions:

  1. Displays a message with the following characteristics:

    Title: ERROR
    Message Body: An unexpected error has occurred on the execution of this file.

  2. Creates the following files:

    • C:\Documents and Settings\All Users\Start Menu\Programs\Startup\WinDash.EXE
    • %System%\WinOIE789.exe
    • %Windir%\Fonts\FontLoader.exe
    • %ProgramFiles%\NetMeeting\NetMeeting.exe

      Notes:
    • %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
    • %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.
  3. Adds the value:

    "ScanRegistry" = ""

    to the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that the worm runs every time Windows starts.

  4. Adds the value:

    "SchedulingAgent" = ""

    to the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

    so that the worm runs every time Windows starts.

  5. Adds the values:

    "DisableTaskmgr" = "1"
    "DisableRegistryTools" = "1"

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

    to disable the Windows Task Manager and the Registry Editor.

  6. Adds the value:

    "Disabled" = "1"

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WinOldApp

    to modify settings on the compromised computer and make it difficult to remove the threat.

  7. Adds the value:

    "NoDevMgrPage" = "1"

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

    to disable the Device Manager page.

  8. Adds the value:

    "NoRealMode" = "1"

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WinOldApp

    to disable real mode DOS.

  9. Adds the values:

    "NoRun" = "hex:01,00,"
    "NoFind" = "1"
    "NoClose" = "hex:01,00,"
    "NoLogOff" = "hex:01,00,"
    "NoDrives" = "3FFFFFF"
    "NoDesktop" = "1"
    "NoSaveSettings" = "hex:00,00,"
    "NoViewContextMenu" = "hex:01,00,"
    "NoTrayContextMenu" = "hex:01,00,"
    "RestrictRun" = "1"
    "NoSetFolders" = "F4240"
    "NoFavoritesMenu" = "1"
    "NoRecentDocsMenu" = "1"
    "NoSetTaskbar" = "1"

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

    in order to change Windows Explorer settings.

  10. Adds the value:

    "NoBrowserClose" = "1"

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Restrictions

    to disable the option of closing Internet Explorer.

  11. Modifies the value:

    "Start Page" = "[http:]//www.ud7swe.t35.com/[REMOVED]/3wY26ss.com"

    in the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main

    in order to change the Internet Explorer start page.

  12. Modifies the values:

    "LegalNoticeCaption" = "??????"
    "LegalNoticeText" = "???????????"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Winlogon

    to display a message that is all question marks (?) before the user logs on.

  13. Modifies the value:

    "NoDesktop" = "1"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer

    to hide all the items and programs on the Windows desktop.

  14. Modifies the value:

    "(Default)" = "C:\Windows\System\Browseui.dll-"

    in the registry subkey:

    HKEY_CLASSES_ROOT\CLSID\{01E04581-4EEE-11d0-BFE9-00AA005B4383}\InProcServer32

    to hide Address Bar from Internet Explorer.

  15. Modifies the value:

    "@" = "txtfile"

    in the registry subkeys:

    HKEY_CLASSES_ROOT\.inf
    HKEY_CLASSES_ROOT\.reg
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.inf
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.reg

  16. Modifies the value:

    "@" ="rem [ViewFolder(%l, %I, %S)]"

    in the registry subkeys:

    HKEY_CLASSES_ROOT\Folder\shell\explore\ddeexec
    HKEY_CLASSES_ROOT\Folder\shell\open\ddeexec
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\explore\ddeexec
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\open\ddeexec

  17. Modifies the values:

    "s1159" = "??????"
    "s2359" = "??????"
    "STimeFormat" = "HH:mm:ss tt"

    in the registry subkey:

    HKEY_CURRENT_USER\Control Panel\International

    to change the time format settings.

  18. Modifies the value:

    "KeyboardDelay" = "9"

    in the registry subkey:

    HKEY_CURRENT_USER\Control Panel\Keyboard

    to delay a character from repeating when the key for that character is held down.

  19. Modifies the values:

    "D2oubleClickSpeed" = "100"
    "MouseSensitivity" = "5"
    "MouseSpeed" = "0"
    "SwapMouseButtons" = "1"

    in the registry subkey:

    HKEY_CURRENT_USER\Control Panel\Mouse

    to change the mouse settings.

  20. Sends an instant message to all the AOL Instant Messenger contacts on the compromised computer.
    This message contains one of the following strings:

    • LMAO OMG THIS IS HILARIOUS!
    • INFINITE FREE PICS OF ASIAN HOTTIES!
    • Lol OMG! Someone posted your picture here!
    • Cool hacking programs!
    • Play the new Aim Online game!
    • Click to join! Better then myspace and xanga!
    • Wanna See My Profile!
    • Download My Profile.
    • LOL Check these Pics out.
    • Have you see this!
    • Take my Quiz!
    • Download my mp3 i made.
    • Check out my music!
    • Funniest Clip Ever!
    • Download Dead Aim (5.9+)- NEW!
    • Check out my webcam.
    • See my Beach pictures!!
    • Make your own Profile!
    • THE KEY TO HAPPINESS IS LAUGHTER!
    • Join this free music site!
    • View My BuddyProfile
    • My Xanga!
    • LOL Watch this clip!
    • LOLOL WTF IS THIS?!
    • Free Aim Password Cracker. Use it to hack your friends.
    • This game is badass! Play now!
    • Email Hacker Pro 1.5 This is awsome! :)
    • Game Hacker program download here.
    • Aim Hacker 1.3 FREE!
    • ate32class
    • Better then limewire and kazaa put together!
    • Get X-im Chat! Better then AIM!
    • Best Aim Password Cracker written by ZeX.
    • Download Aim Optimized 4.9!
    • Hack Webcams and Aim accounts with O-Hax! This is the last day it will be out for free!

      These messages will contain the following link, which will download a copy of itself, if clicked:

      [http:]//www.yu9.us/[REMOVED]o.exe

  21. Spreads through peer-to-peer file sharing applications by dropping copies of itself into the following folders:

    • C:\Program Files\Morpheus\My Shared Folder
    • C:\Program Files\Blubster\My Shared Folder
    • C:\Program Files\Ares\My Shared Folder
    • C:\Program Files\iMesh\iMesh5\Data\Playlists
    • C:\Program Files\Grokster\My Shared Folder
    • C:\Program Files\gnucleus\downloads
    • C:\Program Files\Kazaa\My Shared Folder
    • C:\Program Files\limeWire\Shared
    • C:\My Shared Folder
    • C:\Program Files\KMD\My Shared Folder
    • C:\Program Files\ICQ\shared files
    • C:\Program Files\Shareaza\Downloads
    • C:\Program Files\Edonkey2000\incoming
    • C:\Program Files\overnet\incoming
    • C:\Program Files\winmx\shared
    • C:\Program Files\XoloX\Downloads
    • C:\Program Files\Tesla\Files
    • C:\Program Files\Warez P2P Client\My Shared Folder
    • C:\program files\rapigator\share
    • C:\Program Files\Files\Kazaa Lite\My Shared Folder
    • D:\My Downloads
    • D:\Program Files\Files\Kazaa Lite\My Shared Folder
    • D:\Program Files\Files\Kazaa\My Shared Folder
    • D:\Program Files\Shareaza\Downloads
    • D:\Program Files\Morpheus\My Shared Folder
    • D:\My Shared Folder
    • D:\Program Files\limewire\shared
    • D:\Program Files\winmx\shared
    • D:\Program Files\Warez P2P Client\My Shared Folder
    • D:\Program Files\Edonkey2000\incoming
    • D:\Program Files\overnet\incoming
    • D:\Program Files\bearshare\shared
    • D:\Program Files\iMesh\iMesh5\Data\Playlists
    • E:\My Downloads
    • E:\Program Files\Files\Kazaa Lite\My Shared Folder
    • E:\Program Files\Files\Kazaa\My Shared Folder
    • E:\Program Files\Shareaza\Downloads
    • E:\Program Files\Morpheus\My Shared Folder
    • E:\My Shared Folder
    • E:\Program Files\limewire\shared
    • E:\Program Files\winmx\shared
    • E:\Program Files\Warez P2P Client\My Shared Folder
    • E:\Program Files\Edonkey2000\incoming
    • E:\Program Files\overnet\incoming
    • E:\Program Files\bearshare\shared
    • E:\Program Files\iMesh\iMesh5\Data\Playlists

  22. Copies itself into shared folders, or the folder where the worm was executed, using any of the following file names:

    • PS2 Emulator
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  23. Opens a back door by connecting to a predetermined location, using a random port, and listening for commands. These commands allow a remote attacker to perform various actions on the compromised computer, including downloading and executing remote files.


Recommendations

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

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

Writeup By: Kaoru Hayashi

Discovered: December 11, 2005
Updated: February 13, 2007 12:49:50 PM
Type: Worm
Systems Affected: Windows


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. Download tools and latest virus definitions on another computer
  3. Restart the computer as Safe Mode with Command Prompt
  4. Run the bat file from command prompt
  5. Run explorer from command prompt
  6. Log off, log on computer and run explorer
  7. Update virus definitions
  8. Run a full system scan and delete all the files detected.
  9. Delete any values added to the registry.
  10. Reset the Internet Explorer home page.
For specific details on each of these steps, read the following instructions.

1. To disable 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 are satisfied that the threat has been removed, 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. To download tools and virus definitions on another computer.

W32.Dinoxi makes changes to the Windows registry that may prevent you from running the registry editor. Security Response has developed a tool to reset these values to the default settings.





Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to Virus Definitions (Intelligent Updater) .

The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions . For detailed instructions read the document: How to update virus definition files using the Intelligent Updater .

After downloading tools and virus definitions, please copy them to infected computer.

3. To restart computer as Safe Mode with Command Prompt

For instructions, read the document, "How to start the computer in Safe Mode ." Once you have restarted in Safe mode, run the scan again.

4. Using the tool from Command Prompt

Type fxdinoxi.bat

Note:
Before using the tool, please make sure both fxdinoxi.bat and fxdinoxi.inf files are in same folder.

Once you have run the tool , return to this page and continue with the removal.

5. To run Explorer from Command prompt

Type Explorer

6. To log off, log on computer and run Explorer

Click Start > Log off

Log on again

This will allow the changes made to the registry to go through.

Type Explorer

7. To update the virus definitions

Run Inteligent Updater that is downloaded at Removal Instruction #2

8. To scan for and delete 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, click Delete.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

9. To delete the value from the registry

Important: 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 subkeys only. For instructions refer to the document: How to make a backup of the Windows registry.
  1. Click Start > Run.
  2. Type regedit
  3. Click OK.

    Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.

  4. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  5. In the right pane, delete the value:

    "ScanRegistry" = ""

  6. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

  7. In the right pane, delete the value:

    "SchedulingAgent" = ""

  8. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

  9. In the right pane, delete the values:

    "DisableTaskmgr" = "1"
    "DisableRegistryTools" = "1"

  10. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WinOldApp

  11. In the right pane, delete the value:

    "Disabled" = "1"

  12. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

  13. In the right pane, delete the value:

    "NoDevMgrPage" = "1"

  14. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WinOldApp

  15. In the right pane, delete the value:

    "NoRealMode" = "1"

  16. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

  17. In the right pane, delete the values:

    "NoRun" = "hex:01,00,"
    "NoFind" = "1"
    "NoClose" = "hex:01,00,"
    "NoLogOff" = "hex:01,00,"
    "NoDrives" = "3FFFFFF"
    "NoDesktop" = "1"
    "NoSaveSettings" = "hex:00,00,"
    "NoViewContextMenu" = "hex:01,00,"
    "NoTrayContextMenu" = "hex:01,00,"
    "RestrictRun" = "1"
    "NoSetFolders" = "F4240"
    "NoFavoritesMenu" = "1"
    "NoRecentDocsMenu" = "1"
    "NoSetTaskbar" = "1"

  18. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Restrictions

  19. In the right pane, delete the value:

    "NoBrowserClose" = "1"

  20. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Winlogon

  21. Reset the values to the original value, if applicables:

    "LegalNoticeCaption" = "??????"
    "LegalNoticeText" = "???????????"

  22. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer

  23. Reset the value to the original value, if applicable:

    "NoDesktop" = "1"

  24. Navigate to the subkeys:

    HKEY_CLASSES_ROOT\.inf
    HKEY_CLASSES_ROOT\.reg
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.inf
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.reg

  25. Reset the value to the original value, if applicable:

    "@" = "txtfile"

  26. Navigate to the subkeys:

    HKEY_CLASSES_ROOT\Folder\shell\explore\ddeexec
    HKEY_CLASSES_ROOT\Folder\shell\open\ddeexec
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\explore\ddeexec
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\open\ddeexec

  27. Reset the value to the original value, if applicable:

    "@" ="rem [ViewFolder(%l, %I, %S)]"

  28. Navigate to the subkey:

    HKEY_CURRENT_USER\Control Panel\International

  29. Reset the values to the original value, if applicables:

    "s1159" = "??????"
    "s2359" = "??????"
    "STimeFormat" = "HH:mm:ss tt"

  30. Navigate to the subkey:

    HKEY_CURRENT_USER\Control Panel\Keyboard

  31. Reset the value to the original value, if applicable:

    "KeyboardDelay" = "9"

  32. Navigate to the subkey:

    HKEY_CURRENT_USER\Control Panel\Mouse

  33. Reset the values to the original value, if applicables:

    "DoubleClickSpeed" = "100"
    "MouseSensitivity" = "5"
    "MouseSpeed" = "0"
    "SwapMouseButtons" = "1"

  34. Navigate the subkey:

    HKEY_CLASSES_ROOT\CLSID\{01E04581-4EEE-11d0-BFE9-00AA005B4383}\InProcServer32

  35. Reset the value to the original value:

    "(Default)" = "%SystemRoot%\system32\browseui.dll"
  36. Exit the Registry Editor.

10. To reset the Internet Explorer home page
  1. Start Microsoft Internet Explorer.
  2. Connect to the Internet, and then go to the page that you want to set as your home page.
  3. Click Tools > Internet Options.
  4. In the Home page section of the General tab, click Use Current > OK.

For additional information, or if this procedure does not work, read the Microsoft® Knowledge Base article: Home Page Setting Changes Unexpectedly, or You Cannot Change Your Home Page Setting, Article ID 320159 .



Writeup By: Kaoru Hayashi