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Discovered: November 02, 2004
Updated: February 13, 2007 12:29:30 PM
Also Known As: WORM_BAGZ.F [Trend Micro]. Win, I-Worm.Bagz.g [Kaspersky], W32/Bagz.f@MM [McAfee]
Type: Worm
Systems Affected: Windows

W32.Bagz.H@mm is a mass-mailing worm that uses its own SMTP engine to send itself to the email addresses gathered from a compromised system. It also lowers the security settings by overwriting the local hosts file and preventing access to several security-related Web sites.

Note: If you see an error, such as LU1418, when you try to run LiveUpdate and you cannot get the Web site hosting the Intelligent Updater, it is likely that the worm has modified the Hosts file. You can either download and install LiveUpdate 2.5, which can remove Symantec entries from that file, or you can edit it yourself. See the instructions for both in the "Additional Information" section below.

Removing entries from the Hosts file
If this threat has modified the Windows Hosts file, there are two ways to remove these entries:

  • Install and run the current version of LiveUpdate. This will remove only the entries that refer to Symantec domains.
  • Manually edit the Hosts file and remove all the entries that the worm added.

To run the current version of LiveUpdate
  1. Click download LiveUpdate.

    If you are not reading this Web page on the computer that is getting the error notice, the address for downloading the file is:


    If necessary, you can type this address into the address bar of the problem computer. Changes to the Hosts file will not stop you from getting to this site.

  2. Save the file to the Windows desktop.
  3. Double-click the lusetup.exe icon on the desktop to install LiveUpdate.
  4. Run LiveUpdate.
  5. Did you see the message "LU1860: LiveUpdate has detected a potential security compromise on your computer"?
    • If you did, let LiveUpdate "Remove these entries from the hosts files" (Recommended).
      This should allow LiveUpdate to run.
    • If you did not, that was not the cause of the problem. Return to the Removal section.

To manually edit the Hosts file and remove all the entries that the worm added

Note: The location of the Hosts file may vary and some computers may not have this file. For example, if the file exists in Windows 98, it will usually be in C:\Windows; and it is located in the C:\WINNT\system32\drivers\etc folder in Windows 2000. There may also be multiple copies of this file in different locations.

Follow the instructions for your operating system:
  • Windows 95/98/Me/NT/2000
    1. Click Start, point to Find or Search, and then click Files or Folders.
    2. Make sure that "Look in" is set to (C:) and that "Include subfolders" is checked.
    3. In the "Named" or "Search for..." box, type:


    4. Click Find Now or Search Now.
    5. For each Hosts file that you find, right-click the file, and then click Open With.
    6. Deselect the "Always use this program to open this program" check box.
    7. Scroll through the list of programs and double-click Notepad.
    8. When the file opens, delete all the entries in Step Number 4 of the "Technical Details" section.
    9. Close Notepad and save your changes when prompted.

  • Windows XP
    1. Click Start > Search.
    2. Click All files and folders.
    3. In the "All or part of the file name" box, type:


    4. Verify that "Look in" is set to "Local Hard Drives" or to (C:).
    5. Click More advanced options.
    6. Check Search system folders.
    7. Check Search subfolders.
    8. Click Search.
    9. Click Find Now or Search Now.
    10. For each Hosts file that you find, right-click the file, and then click Open With.
    11. Deselect the Always use this program to open this program check box.
    12. Scroll through the list of programs and double-click Notepad.
    13. When the file opens, delete all the entries in Step Number 4 of the "Technical Details" section.
    14. Close Notepad and save your changes when prompted.

Antivirus Protection Dates

  • Initial Rapid Release version November 02, 2004
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version November 02, 2004
  • Latest Daily Certified version August 09, 2016 revision 001
  • Initial Weekly Certified release date November 03, 2004

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

Writeup By: Rodney Andres

Discovered: November 02, 2004
Updated: February 13, 2007 12:29:30 PM
Also Known As: WORM_BAGZ.F [Trend Micro]. Win, I-Worm.Bagz.g [Kaspersky], W32/Bagz.f@MM [McAfee]
Type: Worm
Systems Affected: Windows

When W32.Bagz.H@mm is executed, it performs the following actions:

  1. Creates the following copies of itself:
    • %System%\SYSINFO32.EXE
    • %System%\TRACE32.EXE

      Note: %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).

  2. Creates the following registry key:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet Services\Xuy v palto

  3. Creates a service with the following properties:

    • Display Name: Windows Secure SSL
    • Image Path: %System%\TRACE32.EXE
    • Description: This service implements the secure HyperText Transfer Protocol (HTTPS) for the HTTP service.

  4. Overwrites local hosts file with the following content:

    • ad.doubleclick.net
    • ad.fastclick.net
    • ads.fastclick.net
    • ar.atwola.com
    • atdmt.com
    • avp.ch
    • avp.com
    • avp.ru
    • awaps.net
    • banner.fastclick.net
    • banners.fastclick.net
    • ca.com
    • click.atdmt.com
    • clicks.atdmt.com
    • dispatch.mcafee.com
    • download.mcafee.com
    • download.microsoft.com
    • downloads.microsoft.com
    • engine.awaps.net
    • fastclick.net
    • f-secure.com
    • ftp.f-secure.com
    • ftp.sophos.com
    • go.microsoft.com
    • liveupdate.symantec.com
    • mast.mcafee.com
    • mcafee.com
    • media.fastclick.net
    • msdn.microsoft.com
    • my-etrust.com
    • nai.com
    • networkassociates.com
    • office.microsoft.com
    • phx.corporate-ir.net
    • secure.nai.com
    • securityresponse.symantec.com
    • service1.symantec.com
    • sophos.com
    • spd.atdmt.com
    • support.microsoft.com
    • symantec.com
    • update.symantec.com
    • updates.symantec.com
    • us.mcafee.com
    • vil.nai.com
    • viruslist.ru
    • windowsupdate.microsoft.com
    • www.avp.ch
    • www.avp.com
    • www.avp.ru
    • www.awaps.net
    • www.ca.com
    • www.fastclick.net
    • www.f-secure.com
    • www.kaspersky.ru
    • www.mcafee.com
    • www.my-etrust.com
    • www.nai.com
    • www.networkassociates.com
    • www.sophos.com
    • www.symantec.com
    • www.trendmicro.com
    • www.viruslist.ru
    • www3.ca.com

  5. Gathers the email addresses by searching for files with the following extensions:

    • .TBB
    • .tbb
    • .TBI
    • .tbi
    • .DBX
    • .dbx
    • .HTM
    • .htm
    • .TXT
    • .txt

  6. Uses its own SMTP engine to send email messages to the collected addresses above.

  7. The email has the following characteristics:

    From: (spoofed)

    Subject: (One of the following)

    • ASAP
    • Administrator
    • Allert!
    • Amirecans
    • Att
    • Have a nice day
    • Hello
    • Hi
    • Money
    • Read this
    • Russian's
    • Vasia
    • Warning
    • attach
    • attachments
    • best regards
    • contract
    • office
    • please responce
    • re: Andrey
    • re: order
    • re: please
    • text
    • toxic
    • urgent
    • waiting

    • Message body: (One of the following)
    • Hi

      Did you get the previous document I attached for you?
      I resent it in this email just in case, because I
      really need you to check it out asap.

      Best Regards

    • Hi

      I made a mistake and forgot to click attach
      on the previous email I sent you. Please give me
      your opinion on this opportunity when you get a chance.

      Best Regards

    • Hi

      I was supposed to send you this document yesterday.
      Sorry for the delay, please forward this to your family if possible.
      It contains important info for both of you.

      Best Regards

    • Hi

      I was in a rush and I forgot to attach an important
      document. Please see attached doc file.

      Best Regards

    • Sorry to bother you, but I am having a problem receiving your emails.
      I am responding to your last email in the attached file.
      Please get back to me if there is any problem reading the attachment.

    • I am responding to your last email in the attached file.
      I had a delivery problem with your inbox, so maybe you'll receive this now.

    • Can you please check out the email I have attached?
      For some reason, I received only part of your last several emails.
      I want to make sure that there are no problems with either of our accounts.
      This email is being sent as attachment because
      it was previously blocked by your email filters.
      Please view the attachment and respond.

    • I resent this email as attachment because
      it was previously blocked by your email filters.
      Please read the attachment and respond.

    • I apologize, but I need you to verify
      that I have the correct contact info for you.
      My system crashed last weekend and
      I lost most of my friends and work contacts.
      Please check the attached (.pdf) and
      please let me know if your info is current.

    • My last email to you was returned.
      The reason is that I am not currently
      added to your "allowed" contact list.
      Please add my updated contact info
      provided in the attached (.pdf) file
      so I can send you emails in the future.

    • I have updated my email address
      See the (.pdf) file attached and
      please respond if you have any questions.

      We have made recent updates to our database.
      Please verify your mailing address on file is correct.
      We have attached a (.pdf) sheet for you to use for your response.

    • Hello
      Our contact information has changed.
      See the attached (.pdf) sheet for details.

      Due to your failure to comply with our email
      Rules and Regulations, your email account has been
      temporarily suspended for 24 hours unless we are contacted regarding
      this situation.
      You must read the attached document for further
      instructions. Failure to comply will result in termination of your account.
      Net Operator

      You are currently unable to send emails.
      This may be a billing issue.
      Please call the billing center.
      The # for the billing office is located in the attached
      contact list for your convenience.

      The previous email you sent has been recognized as spam.
      This means your email was not delivered to your friend or client.
      You must open the attached file to receive more information.

    • Hello,
      What version of windows you are using?
      This last document I received from you came out weird.
      Please see the attached word file and resend the file to me.
      Many thanks,

    • Hello,
      My PC crashed while I was sending that last email.
      I have re-attached the document of yours that I discovered.
      Please read attached document and respond ASAP.

    • Hello,
      Your email was sent in an INVALID format.
      To verify this email was sent from you,
      simply open the attached email (.eml) file
      and click yes in the sender options box.
      Thank You,

    • Hello,
      Your email was received.
      Please view the attached text file for instructions.

    • Hello,
      I was in a hurry and I forgot to attach an important
      document. Please see attached.
      Best Regards,

    • Hello,
      I resent this email as attachment because
      it was previously blocked by your email filters.
      Please read the attachment and respond.

    • Hello,
      Sorry, I forgot to attach the new contact information.
      Please view the attached (.pdf) contact sheet.

      Attachment: (One of the following)
    • about.doc(spaces).exe
    • about.zip
    • admin.doc(spaces).exe
    • admin.zip
    • archivator.doc(spaces).exe
    • archivator.zip
    • archives.doc(spaces).exe
    • archives.zip
    • ataches.doc(spaces).exe
    • ataches.zip
    • backup.doc(spaces).exe
    • backup.zip
    • docs.doc(spaces).exe
    • docs.zip
    • documentation.doc(spaces).exe
    • documentation.zip
    • help.doc(spaces).exe
    • help.zip
    • inbox.doc(spaces).exe
    • inbox.zip
    • manual.doc(spaces).exe
    • manual.zip
    • outbox.doc(spaces).exe
    • outbox.zip
    • payment.doc(spaces).exe
    • payment.zip
    • photos.doc(spaces).exe
    • photos.zip
    • rar.doc(spaces).exe
    • rar.zip
    • readme.doc(spaces).exe
    • readme.zip
    • save.doc(spaces).exe
    • save.zip
    • sqlssl.doc(spaces).exe
    • zip.doc(spaces).exe
    • zip.zip

  8. Avoids sending email to the addresses that contain any of the following strings:

    • @avp
    • @foo
    • @iana
    • @messagelab
    • @microsoft
    • abuse
    • admin
    • administrator@
    • all@
    • anyone@
    • bsd
    • bugs@
    • cafee
    • certific
    • certs@
    • contact@
    • contract@
    • f-secur
    • feste
    • free-av
    • gold-
    • gold-certs@
    • google
    • help@
    • hostmaster@
    • icrosoft
    • info@
    • kasp
    • linux
    • listserv
    • local
    • netadmin@
    • news
    • nobody@
    • noone@
    • noreply
    • ntivi
    • panda
    • pgp
    • postmaster@
    • rating@
    • root@
    • samples
    • sopho
    • spam
    • support
    • support@
    • unix
    • update
    • webmaster@
    • winrar
    • winzip

  9. Searches through the following registry keys and their subkeys:


    then deletes any values that contain any of the following strings:


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: Rodney Andres

Discovered: November 02, 2004
Updated: February 13, 2007 12:29:30 PM
Also Known As: WORM_BAGZ.F [Trend Micro]. Win, I-Worm.Bagz.g [Kaspersky], W32/Bagz.f@MM [McAfee]
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. Update the virus definitions.
  3. Run a full system scan and delete all the files detected asW32.Bagz.H@mm.
  4. Delete the value that was added to the registry.

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:

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 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 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 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 withW32.Bagz.H@mm, click Delete.

    If your Symantec antivirus product reports that it cannot delete an infected file, Windows may be using the file. To fix 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, you can leave the computer in Safe mode and proceed with section 4. When that is done, restart the computer in Normal mode.)

4. To delete the value from the registry

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\SYSTEM\CurrentControlSet Services

  4. In the left pane, delete the subkey:

    "Xuy v palto"

  5. Exit the Registry Editor.

Writeup By: Rodney Andres