Printer Friendly Page

Discovered: September 28, 2003
Updated: February 13, 2007 12:08:10 PM
Also Known As: W32/Holar.l@MM [McAfee], I-Worm.Hawawi.g [Kaspersky], Win32.Holar.G [Computer Associ, WORM_HAWAWI.F [Trend]
Type: Worm
Systems Affected: Windows

W32.Galil.C@mm is a mass-mailing worm that sends itself to the email addresses it finds in the files that have the .htm, .html, .eml, and .txt file extensions. The email will have a variable subject line and attachment name. The original sample received had a .scr file extension.

This worm sends itself to all the contacts in the Microsoft Outlook Address Book and MSN messenger contact list, and it attempts to spread itself through the KaZaA file-sharing network.

This threat is written in the Microsoft Visual Basic programming language and is compressed with UPX.

Antivirus Protection Dates

  • Initial Rapid Release version September 29, 2003
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version September 29, 2003
  • Latest Daily Certified version August 09, 2016 revision 001
  • Initial Weekly Certified release date October 01, 2003

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

Writeup By: Yana Liu

Discovered: September 28, 2003
Updated: February 13, 2007 12:08:10 PM
Also Known As: W32/Holar.l@MM [McAfee], I-Worm.Hawawi.g [Kaspersky], Win32.Holar.G [Computer Associ, WORM_HAWAWI.F [Trend]
Type: Worm
Systems Affected: Windows

When W32.Galil.C@mm runs, it does the following:

  1. Copies itself as %System%2.sys.

    Note: %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. Creates the following files:
    • %Temp%\Explore.exe, which is 20,992 bytes in length. The file attributes are Hidden, Read-only, and System.
    • %Temp%\A.exe, which is 9,216 bytes in length.
    • %Temp%\SMTP.ocx, which is 25,737 bytes in length.

    • SMTP.ocx does not contain viral code, and therefore Symantec antivirus products do not detect it.
    • %Temp% is a variable. The worm locates the Window temporary folder and copies its components to that location.
      For example, in Windows 2000, %Temp% can be C:\documents and settings\<current user name>\local settings\temp.

A.exe is the worm's installer component. When it runs, it does the following:
  1. Copies itself to %System%\folder as these files:
    • a.bat
    • a.com
    • a.exe
    • a.pif
    • a.scr
    • a.sys

  2. Copies Explore.exe and SMTP.ocx to the %System%folder.

  3. Adds the value:


    to the registry key:


    so that the worm's component runs when you restart Windows.

Spread routine
Explore.exe is the worm's component that contains its spread routine. When it runs, it does the following:
  1. Adds the value "a" to the registry key:


    The worm uses this key as its infection marker.

  2. Changes the home page of Internet Explorer to www.geocities.com/yori_mrakkadi."

  3. Adds a value "DeathTime" to the registry key:


    The value increases by 1 each time Explore.exe runs. When the value reaches 30, the worm disables the mouse and keyboard.

  4. Locates the KaZaA download folder through the registry.

  5. Searches for files whose extensions are .doc, .jpg, .mdb, .pps, .ram, .xls, or .zip. Then, it copies the worm to the KaZaA download folder using the file names.

  6. Retrieves the current users email address and default SMTP server IP address.

  7. Retrieves the email addresses from the files whose extensions are .htm, .html, .eml, and .txt.

  8. Retrieves the email addresses from the Outlook address book and MSN messenger contact list.

  9. Uses SMTP.ocx to send the worm to the email addresses that it finds. The worm uses the file name that it runs from as the attachment name.
    The subject line is one of the following:
    • Fw:
    • Re:
    • You gonna love it
    • Here is what u wanted
    • Check this out ;)
    • Enjoy!
    • This is all i can send
    • Have Fun :)
    • Wait for more :)
    • looool
    • Take a look
    • Never mind !
    • See the attatched file
    • gift :)
    • Surprise!
    • save it for hard times
    • Happy Times :)
    • Useful
    • Very funny
    • Try it
    • you have to see this!
    • emazing!

  10. Steals network information and emails it to a predefined email address. The stolen information may include:
    • Host name for the computer
    • Domain in which the computer is registered
    • Set of DNS servers IP address, which the computer uses
    • DHCP server IP address, which the computer uses


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: Yana Liu

Discovered: September 28, 2003
Updated: February 13, 2007 12:08:10 PM
Also Known As: W32/Holar.l@MM [McAfee], I-Worm.Hawawi.g [Kaspersky], Win32.Holar.G [Computer Associ, WORM_HAWAWI.F [Trend]
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. Restart the computer in Safe Mode or VGA mode.
  4. Run a full system scan and delete all the files detected as W32.Galil.C@mm.
  5. Delete the value that was added to the registry.
  6. Reset the Internet Explorer Home Page
For specific details on each of these steps, read the following instructions.

1. Disabling 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:
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. Updating 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. Restarting 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. Scanning for and deleting 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.Galil.C@mm, click Delete.

5. Deleting the value from the registry

WARNING: 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, and then click Run. (The Run dialog box appears.)
  2. Type regedit

    Then click OK. (The Registry Editor opens.)

  3. Navigate to the key:


  4. In the right pane, delete the value "a."

  5. Navigate to the key:


  6. In the right pane, delete the value:


  7. Exit the Registry Editor.

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

Writeup By: Yana Liu