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  2. Security Response/
  3. W32.Swen.A@mm

W32.Swen.A@mm - Removal

Risk Level 2: Low

Discovered:
September 18, 2003
Updated:
February 13, 2007 12:07:33 PM
Also Known As:
Swen [F-Secure], W32/Swen@mm [McAfee], W32/Gibe-F [Sophos], I-Worm.Swen [KAV], Win32 Swen.A [CA], WORM_SWEN.A [Trend], Worm.Automat.AHB [Previous Sym
Type:
Worm
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
CVE References:
CVE-2001-0154

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


Note: Due to the numerous changes that the worm makes to the Windows registry, the worm can be somewhat difficult to remove if it has already run and your
Symantec antivirus product subsequently quarantined or deleted it.

Follow the instructions in the section below that describes your situation. We strongly advise that you read all the instructions in the appropriate sections before you start.

W32.Swen.A@mm has not been quarantined or deleted
If your Symantec antivirus product has not quarantined or deleted W32.Swen.A@mm, and you suspect or know that W32.Swen.A@mm is on your system, follow these steps:
  1. Download and run the W32.Swen.A@mm Removal Tool. Complete instructions are in the W32.Swen.A@mm Removal Tool document.

  2. After the tool has run, 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. Run a full system scan.
    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.Swen.A@mm, click Delete.


W32.Swen.A@mm has already been quarantined or deleted
If your Symantec antivirus product has already detected and then quarantined or deleted W32.Swen.A@mm, you will not be able to run the .exe, .com, and other executable files. Follow the instructions for your operating system.

For Windows 95/98
  1. Restart the computer.
  2. Do one of the following:
    • Windows 95: When "Starting Windows 95..." appears on the screen, press F8. The Windows 95 Startup Menu appears.
    • Windows 98: As the computer restarts, press and hold down the Ctrl key until the Windows 98 Startup Menu appears.


      Note: On some computers, a keyboard or other error may appear during restart as you hold down the Ctrl key. If this happens, then follow the prompts to press a key to continue (for example, the message may prompt you to press the Esc key), then immediately press the Ctrl key again.

  3. Select "Command Prompt only."

  4. Type the following and press Enter after typing each line:

    cd\
    cd windows
    edit repair.reg


    The DOS text editor opens.

  5. Type the following lines into the DOS text editor exactly as shown here:

    REGEDIT4

    [HKEY_CLASSES_ROOT\exefile\shell\open\command]
    @="\"%1\" %*"

    [HKEY_CLASSES_ROOT\regfile\shell\open\command]
    @="regedit.exe \%1\"


  6. Press Alt and F at the same time to access the File menu, and then press X to exit the DOS text editor. When prompted, press Enter to confirm that you want to save the file. This returns you to the command prompt.

  7. Type the following and press Enter after typing each line. You must type them exactly as shown here:

    regedit /e backup.reg  hkey_classes_root\exefile
    regedit /e backup2.reg  hkey_classes_root\regfile
    regedit /d hkey_classes_root\exefile\shell\open\command
    regedit /d hkey_classes_root\regfile\shell\open\command
    regedit repair.reg


  8. Restart the computer.

  9. Download and run the W32.Swen.A@mm Removal Tool. Complete instructions are in the W32.Swen.A@mm Removal Tool document.

  10. After the tool has run, 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.

  11. Run a full system scan.
    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.Swen.A@mm, click Delete.

For Windows Me
To perform this procedure on Windows Me, you must have a Windows Me boot disk. If you cannot locate the Me boot disk that came with your computer, you may be able to obtain one from the PC vender or a local computer store.
  1. Insert the Windows Me boot disk in the floppy disk drive and restart the computer. The computer opens to a MS-DOS prompt.

  2. Type the following and then press Enter after typing each line:

    c:
    cd\
    cd windows
    edit repair.reg


    The DOS text editor opens.

  3. Type the following lines into the DOS text editor exactly as shown here:

    REGEDIT4

    [Hkey_classes_root\exefile\shell\open\command]
    @="\"%1\" %*"

    [Hkey_classes_root\regfile\shell\open\command]
    @="regedit.exe \%1\"


  4. Press Alt and F at the same time to access the File menu, and then press X to exit the DOS text editor. When prompted, press Enter to confirm that you want to save the file. This returns you to the command prompt.

  5. Type the following and then press Enter after typing each line. You must type them exactly as shown here:

    regedit /e backup.reg  hkey_classes_root\exefile
    regedit /e backup2.reg  hkey_classes_root\regfile
    regedit /d hkey_classes_root\exefile\shell\open\command
    regedit /d hkey_classes_root\regfile\shell\open\command
    regedit repair.reg


  6. Restart the computer.

  7. Download and run the W32.Swen.A@mm Removal Tool. Complete instructions are in the W32.Swen.A@mm Removal Tool document.

  8. After the tool has run, 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.

  9. Run a full system scan.
    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.Swen.A@mm, click Delete.


    For Windows NT/2000/XP
    1. Download the W32.Swen.A@mm Removal Tool and follow the instructions in the W32.Swen.A@mm Removal Tool document. However, when you get to step 5, which instructs you to "Double-click the FixSwen.exe file," stop. Do not double-click the file. Instead:
      1. Start Windows Explorer.
      2. Click View > Options (Windows NT) or Tools > Folder Options (Windows 2000/XP).
      3. Click the View tab.
      4. Uncheck "Hide file extensions for known file types." Click Yes if you see a warning dialog box.
      5. Click Apply, and then click OK.
      6. Right-click the FixSwen.exe file, and then click Rename, and rename it to FixSwen.cmd. Confirm the renaming, if prompted.
      7. Double-click the FixSwen.cmd file, and then continue with the steps.
      8. Right-click the downloaded FixSwen.exe file, and then click Rename.

        Rename the file to:

        FixSwen.cmd

      9. When you are asked whether you want to change the file extension, click Yes.
      10. Double-click the FixSwen.cmd file and continue with the steps in the Removal Tool document.

    2. After the tool has run, 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. Run a full system scan.
      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.Swen.A@mm, click Delete.




    Writeup By: John Canavan

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