W32.Lovgate.AD@mm

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Discovered: July 13, 2004
Updated: February 13, 2007 12:25:07 PM
Also Known As: W32/Lovgate.ah@MM [McAfee]
Type: Worm
Systems Affected: Windows



W32.Lovgate.AD@mm is a mass-mailing worm that spreads using the Microsoft Windows DCOM RPC Interface Buffer Overrun Vulnerability (described in Microsoft Security Bulletin MS03-026 ), and through open network shares. The email has a variable subject and attachment. The attachment will have a .bat, .exe, .pif, or .scr file extension.

The worm infects executable files and allows unauthorized remote access to an infected computer.


Antivirus Protection Dates

  • Initial Rapid Release version July 13, 2004
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version July 13, 2004
  • Latest Daily Certified version August 09, 2016 revision 001
  • Initial Weekly Certified release date July 13, 2004

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

Discovered: July 13, 2004
Updated: February 13, 2007 12:25:07 PM
Also Known As: W32/Lovgate.ah@MM [McAfee]
Type: Worm
Systems Affected: Windows


When W32.Lovgate.AD@mm is executed, it performs the following actions:

  1. Copies itself as the following:
    • %Windir%\SYSTRA.EXE
    • %Windir%\suchost.exe
    • %System%\hxdef.exe
    • %System%\IEXPLORE.EXE
    • %System%\RAVMOND.exe
    • %System%\realsched.exe
    • %System%\vptray.exe
    • %System%\kernel66.dll (With attributes set to Read Only, Hidden, and System)
    • C:\COMMAND.EXE
    • C:\AUTORUN.INF
    • %System%\ODBC16.dll (A component of the backdoor. 53,248 bytes)
    • %System%\msjdbc11.dll (A component of the backdoor. 53,248 bytes)
    • %System%\MSSIGN30.DLL (A component of the backdoor. 53,248 bytes)
    • %System%\LMMIB20.DLL (A component of the backdoor. 53,248 bytes)

      Notes:
    • %Windir% is a variable. The worm locates the Windows installation folder (by default, this is C:\Windows or C:\Winnt) and copies itself to that location.
    • %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).

  2. Adds the values:

    "WinHelp"="%system%\realsched.exe"
    "Hardware Profile"="%system%\hxdef.exe"
    "Program In Windows"="%system%\IEXPLORE.EXE"
    "Microsoft NetMeeting Associates, Inc."="NetMeeting.exe"
    "VFW Encoder/Decoder Settings"="RUNDLL32.EXE MSSIGN30.DLL ondll_reg"
    "Protected Storage"="RUNDLL32.EXE MSSIGN30.DLL ondll_reg"
    "Shell Extension"="%system%\spollsv.exe"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  3. Adds the values:

    "SystemTra"="%Windor%\SysTra.EXE"
    "COM++ System"="suchost.exe"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

    so that the worm runs when you start Windows 95/98/Me.

  4. Adds the value:

    "run"="RAVMOND.exe"

    to the registry key:

    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows

    so that the worm runs when you start Windows NT/200/XP

  5. Modifies the value:

    "(Default)"="vptray.exe %1"

    in the registry keys:

    HKEY_CLASSES_ROOT\txtfile\shell\open\command
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\txtfile\shell\open\command

    so that the worm runs each time that a .txt file is opened.

  6. Creates the following services:
    • Display name: _reg
      ImagePath: Rundll32.exe msjdbc11.dll ondll_server
      Startup: automatic
    • Display name: Windows Management Protocol v.0 (experimental)
      Description: Windows Advanced Server. Performs scheduled scans for LANguard.
      ImagePath: Rundll32.exe msjdbc11.dll ondll_server
      Startup: automatic

  7. Terminates any processes that have the following strings in their names:
    • KV
    • KAV
    • Duba
    • NAV
    • kill
    • RavMon.exe
    • Rfw.exe
    • Gate
    • McAfee
    • Symantec
    • SkyNet
    • rising

  8. Attempts to propagate to other computers by exploiting the Microsoft Windows DCOM RPC Interface Buffer Overrun Vulnerability (described in Microsoft Security Bulletin MS03-026).

  9. Scans all the drives on the infected computer. If the drive type is removable, mapped, or the drive type is fixed with a drive letter greater than E, it does the following:
    • Attempts to rename the extensions of all .exe files to .zmx.
    • Sets the attributes on these files to hidden and system.
    • Copies itself as the original file name.

  10. Scans the computers attached to the same local network as the infected computer, attempting to authenticate to the admin$ share. The worm uses "Guest," "Admin," or "Administrator" for a user name, combined with the following passwords:
    • !@#$
    • !@#$%
    • !@#$%^
    • !@#$%^&
    • !@#$%^&*
    • 000000
    • 00000000
    • 007
    • 110
    • 111
    • 111111
    • 11111111
    • 121212
    • 123
    • 123123
    • 1234
    • 12345
    • 123456
    • 1234567
    • 12345678
    • 123456789
    • 123abc
    • 123asd
    • 2003
    • 2004
    • 2600
    • 321
    • 54321
    • 654321
    • 666666
    • 888888
    • 88888888
    • aaa
    • abc
    • abc123
    • abcd
    • abcdef
    • abcdefg
    • Admin
    • admin
    • admin123
    • Administrator
    • administrator
    • alpha
    • asdf
    • asdfgh
    • computer
    • database
    • enable
    • god
    • godblessyou
    • Guest
    • guest
    • home
    • Internet
    • login
    • Login
    • love
    • mypass
    • mypass123
    • mypc
    • mypc123
    • oracle
    • owner
    • pass
    • passwd
    • Password
    • password
    • pw123
    • pwd
    • root
    • secret
    • server
    • sex
    • sql
    • super
    • sybase
    • temp
    • temp123
    • test
    • test123
    • win
    • xxx
    • yxcv
    • zxcv

  11. If the worm successfully authenticates to a remote computer, it will attempt to create the following copy of itself as \\<remote computer>\admin$\system32\NetManager32.exe.

  12. Creates a service on the remote computer named "Windows Management NetWork Service Extensions" and a share named "Media".

  13. May copy itself to shared drives using one or more of the following names:
    • WinRAR.exe
    • Internet Explorer.bat
    • Documents and Settings.txt.exe
    • Microsoft Office.exe
    • Windows Media Player.zip.exe
    • Support Tools.exe
    • WindowsUpdate.pif
    • Cain.pif
    • MSDN.ZIP.pif
    • autoexec.bat
    • findpass.exe
    • client.exe
    • i386.exe
    • winhlp32.exe
    • xcopy.exe
    • mmc.exe

  14. Opens a backdoor on a random port.

  15. Replies to any email messages that arrive in the inbox of certain MAPI-compliant email clients, such as Microsoft Outlook.

    For example, if the incoming email has the following properties:

    Subject: <subject>
    Message: <original message body>

    The reply will be formatted as follows:

    Subject: Re: <subject>

    Message:
    <original message body>
    <domain name> auto-reply:
    If you can keep your head when all about you
    Are losing theirs and blaming it on you;
    If you can trust yourself when all men doubt you,
    But make allowance for their doubting too;
    If you can wait and not be tired by waiting,
    Or, being lied about,don't deal in lies,
    Or, being hated, don't give way to hating,
    And yet don't look too good, nor talk too wise;
    ... ... more look to the attachment.

    > Get your FREE <domain name> Mail now! <

    Attachment: (One of the following)
    • the hardcore game-.pif
    • Sex in Office.rm.scr
    • Deutsch BloodPatch!.exe
    • s3msong.MP3.pif
    • Me_nude.AVI.pif
    • How to Crack all gamez.exe
    • Macromedia Flash.scr
    • SETUP.EXE
    • Shakira.zip.exe
    • dreamweaver MX (crack).exe
    • StarWars2 - CloneAttack.rm.scr
    • Industry Giant II.exe
    • DSL Modem Uncapper.rar.exe
    • joke.pif
    • Britney spears nude.exe.txt.exe
    • I am For u.doc.exe

  16. May gather email addresses on an infected computer and send an email with the following properties:

    Subject: (One of the following)
    • test
    • hi
    • hello
    • Mail Delivery System
    • Mail Transaction Failed
    • Server Report
    • Status
    • Error

      Message: (One of the following)
    • Mail  failed.  For further assistance, please contact!
    • The message contains Unicode characters and has been sent as a binary attachment.
    • It's the long-awaited film version of the Broadway hit. The  message sent as  a binary attachment.

      Attachment: (Randomly constructed, with one of the following extensions)
    • .exe
    • .scr
    • .pif
    • .com
    • .rar

  17. Infects .exe files by doing the following to a host file:
    • Prepending a copy of the dropped file, suchost.exe.
    • Appending a copy of the original worm.


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.

Discovered: July 13, 2004
Updated: February 13, 2007 12:25:07 PM
Also Known As: W32/Lovgate.ah@MM [McAfee]
Type: Worm
Systems Affected: Windows


Removal using the Removal Tool
Symantec Security Response has developed a removal tool to clean the infections of W32.Lovgate.AD@mm. This is the preferred method in most cases.

Manual Removal
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. Restart the computer in Safe mode or VGA mode.
  4. Run a full system scan and delete all the files detected as W32.Lovgate.AD@mm.
  5. Reverse the changes made to the registry.
  6. Rename the .zmx files to the .exe files.

For 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, re-enable 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 the Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). 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 the Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.

3. To restart the computer in Safe mode or VGA mode
Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode or VGA mode.
  • For Windows 95, 98, Me, 2000, or XP users, restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
  • For Windows NT 4 users, restart the computer in VGA mode.
4. 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 as infected with W32.Lovgate.AD@mm, click Delete.

5. To reverse the changes made to 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 keys only. Read the document, "How to make a backup of the Windows registry," for instructions.

  1. Click Start > Run.
  2. Type regedit

    Then click OK.

  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the values:

    "WinHelp"="%system%\realsched.exe"
    "Hardware Profile"="%system%\hxdef.exe"
    "Program In Windows"="%system%\IEXPLORE.EXE"
    "Microsoft NetMeeting Associates, Inc."="NetMeeting.exe"
    "VFW Encoder/Decoder Settings"="RUNDLL32.EXE MSSIGN30.DLL ondll_reg"
    "Protected Storage"="RUNDLL32.EXE MSSIGN30.DLL ondll_reg"
    "Shell Extension"="%system%\spollsv.exe"

  5. Do one of the following:
    • If you are running Windows 95/98/Me, navigate to the key:

      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

      In the right pane, delete the values:

      "SystemTra"="%Windor%\SysTra.EXE"
      "COM++ System"="suchost.exe"

    • If you are running Windows NT/2000/XP, navigate to the key:

      HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows

      In the right pane, delete the value:

      "run"="RAVMOND.exe"

  6. Navigate to the key:

    HKEY_CLASSES_ROOT\txtfile\shell\open\command

  7. In the right pane, double-click:

    (Default)

  8. Delete the text from the Value data field, and replace it with:

    NOTEPAD.EXE %1

  9. Exit the Registry Editor.

  10. Restart the computer in Normal mode. For instructions, read the section on returning to Normal mode in the document, "How to start the computer in Safe Mode."

6. To rename the .zmx files to the .exe files
As W32.Lovgate.AD@mm modifies the .exe files, correct this for relevant programs to function correctly.
  1. Follow the instructions for your operating system:
    • Windows 98/Me/2000
      1. On the Windows desktop, click the Start button > Find or Search > Files or Folders.
      2. In the Search Results window, set "Look in" to the first removable, mapped, or fixed drive type with a drive letter greater than E.
      3. Check Include subfolders.
      4. In the Named or Search for... box, type, or copy and paste, the following:

        *.zmx

      5. Click Find Now or Search Now.

    • Windows XP
      1. On the Windows desktop, click the Start button > Search.
      2. Click All files and folders.
      3. In the "All or part of the file name box," type, or copy and paste, the following:

        *.zmx

      4. Verify that "Look in" is set to the first removable, mapped, or fixed drive type with a drive letter greater than E.
      5. Click More advanced options.
      6. Select Search system folders.
      7. Select Search subfolders.
      8. Select Search hidden files and folders.
      9. Click Search.

  2. For every file that is found, right click it, select Rename, and then change the .zmx extension to .exe.

  3. Repeat step 6 for every removable, mapped, or fixed drive type with a drive letter greater than E.