Trojan.Bookmarker.J

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Discovered: November 30, 2005
Updated: February 13, 2007 12:49:22 PM
Type: Trojan Horse
Systems Affected: Windows


Trojan.Bookmarker.J is a Trojan horse that modifies Internet Explorer settings by changing the home page and search page, and by adding Web sites to the Favorites menu. The Trojan also downloads remote files and opens a back door.

Antivirus Protection Dates

  • Initial Rapid Release version November 30, 2005
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version November 30, 2005
  • Latest Daily Certified version August 09, 2016 revision 001
  • Initial Weekly Certified release date November 30, 2005

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

Writeup By: Elia Florio

Discovered: November 30, 2005
Updated: February 13, 2007 12:49:22 PM
Type: Trojan Horse
Systems Affected: Windows


When executed Trojan.Bookmarker.J, performs the following actions:

  1. Copies itself as the following file:

    %Windir%\inet20004\[FILE NAME]

    Note:
    • [FILE NAME] may be either services.exe or winlogon.exe.
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).

  2. Deletes the following files:

    • C:\web.exe
    • C:\Documents and Settings\All Users\Start Menu\Startup\Microsoft Office.hta

  3. Adds the value:

    "xp_system" = "%Windir%\inet20004\[FILE NAME]"

    to the registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows

    so that it is executed every time Windows starts.

  4. Adds one of the following lines to the %Windir%\SYSTEM.INI file or %Windir%\WIN.INI file so that it is executed every time Windows starts:

    • "load=%Windir%\inet20004\[FILE NAME"
    • "run=%Windir%\inet20004\[FILE NAME]"

  5. Creates the following registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{5321E378-FFAD-4999-8C62-03CA8155F0B3}

  6. Adds the value:

    "Enable Browser Extensions" = "yes"

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main

  7. Downloads files from the following Web sites:

    • [http://]kannylizaciya.info/[REMOVED]
    • [http://]hilarius.info[REMOVED]
    • [http://]gaddybaby.info[REMOVED]
    • [http://]traff-store.com[REMOVED]

  8. Sends confidential system information to the above Web sites.

  9. Downloads copy of Trojan.Spamforo from [http://]kannylizaciya.info/[REMOVED].

  10. Opens a back door, which allows a remote attacker to perform the following actions on the compromised computer:

    • Download and execute remote files
    • Modify the registry
    • Add Web sites to the Trusted Sites list of Internet Explorer
    • Add Web sites to the Internet Explorer Favorites menu
    • Hijack Internet Explorer sessions to redirect the browser to potentially malicious Web sites
    • Open hidden Internet Explorer windows and navigate to a chosen Web site
    • Install a Browser Helper Object for Internet Explorer

  11. Alters the Internet Explorer home page, search page, and search bar by modifying the following registry subkeys:

    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Start Page
    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Search Page
    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Search Bar
    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchURL


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: Elia Florio

Discovered: November 30, 2005
Updated: February 13, 2007 12:49:22 PM
Type: Trojan Horse
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. Update the virus definitions.
  3. Run a full system scan and delete all the files detected.
  4. Delete any values added to the registry.
  5. Edit the Win.ini file.
  6. Edit the System.ini file.
  7. Reset the Internet Explorer home page.
  8. Reset the Internet Explorer search 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 update 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:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to Virus Definitions (LiveUpdate).
  • 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.


3. 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.

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode . Once you have restarted in Safe mode, run the scan again.

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.


4. 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 subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows

  5. In the right pane, delete the value:

    "xp_system" = "%Windir%\inet20004\[FILE NAME]"

  6. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main

  7. In the right pane, delete the value:

    "Enable Browser Extensions" = "yes"

  8. Navigate to and delete the following subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{5321E378-FFAD-4999-8C62-03CA8155F0B3}

  9. Exit the Registry Editor.

5. To edit the Win.ini file
If you are running Windows 95/98/Me, follow these steps:
  1. Click Start > Run.
  2. Type the following:

    edit c:\windows\win.ini

    and then click OK.

    (The MS-DOS Editor opens.)

    NOTE: If Windows is installed in a different location, make the appropriate path substitution.

  3. In the [windows] section of the file, look for a line similar to any of the following:

    "load=%Windir%\inet20004\[FILE NAME]"
    "run=%Windir%\inet20004\[FILE NAME]"

  4. If this line exists, delete everything to the right of run= or load=

  5. Click File > Save.
  6. Click File > Exit.

6. To edit the System.ini file
If you are running Windows 95/98/Me, follow these steps:
  1. Click Start > Run.
  2. Type the following:

    edit c:\windows\system.ini

    and then click OK.

    (The MS-DOS Editor opens.)

    NOTE: If Windows is installed in a different location, make the appropriate path substitution.

  3. In the [boot] section of the file, look for a line similar to:

    "load=%Windir%\inet20004\[FILE NAME]"
    "run=%Windir%\inet20004\[FILE NAME]"


  4. If this line exists, delete everything to the right of Explorer.exe.

    When you are done, it should look like:

    shell = Explorer.exe

  5. Click File > Save.
  6. Click File > Exit.

7. 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 .

8. To reset the Internet Explorer search page
Follow the instructions for your version of Windows.

Windows 98/Me/2000
  1. Start Microsoft Internet Explorer.
  2. Click the Search button on the toolbar.
  3. In the Search pane, click Customize.
  4. Click Reset.
  5. Click Autosearch Settings.
  6. Select a search site from the drop-down list, and then click OK.
  7. Click OK.

Windows XP
Because Windows XP is set by default to use animated characters in the search, how you do this can vary. Read all the instructions before you start.
  1. Start Microsoft Internet Explorer.
  2. Click the Search button on the toolbar.
  3. Do one of the following:
    • If the pane that opens looks similar to the following picture, click the word Customize and proceed to step h:




    • If the pane that opens has the words "Search Companion" at the top, and the center looks similar to the following picture, click the Change preferences link and proceed with step d.




  4. Click the Change Internet search behavior link.
  5. Under "Internet Search Behavior," click With Classic Internet Search.
  6. Click OK. Then close Internet Explorer. (Close the program for the change to take effect.)
  7. Start Internet Explorer. When the search pane opens, it should look similar to the following picture:





    Click the word Customize, and then proceed with the next step.

  8. In the Search pane, click Customize.
  9. Click Reset.
  10. Click Autosearch Settings.
  11. Select a search site from the drop-down list, and then click OK.
  12. Click OK.
  13. Do one of the following:
    • If you were using (or want to continue using) the "Classic Internet Search" panel, stop here (or proceed with the next section).
    • If you want to go back to the "Search Companion" search (it usually has an animated character at the button), proceed with step n.

  14. Click the word Customize again.
  15. In the "Customize Search Settings" window, click Use Search Companion > OK.
  16. Close Internet Explorer. The next time you open it, it will again use the Search Companion.


Writeup By: Elia Florio