W32.Galil.F@mm

Printer Friendly Page

Discovered: February 02, 2004
Updated: February 13, 2007 12:16:59 PM
Also Known As: W32/Holar.gen@MM [McAfee], I-Worm.Holar.f [Kaspersky]
Type: Worm
Systems Affected: Windows


W32.Galil.F@mm is a mass-mailing worm that uses its own SMTP engine or Microsoft Outlook to spread. It harvests email addresses from the files in the current user's Temporary Internet Files folder, Yahoo Messenger, Microsoft Outlook address book, as well as the files whose extensions are .asf, .avi, .doc, .jpg, .mdb, .mpe, .mpeg, .mpg, .pps, .ram, .rar, or .xls.

The worm may spoof the "From" field. The email message has a randomly selected subject line, which may also be the attachment name. The attachment has a .bhx, .exe, .hqx, .mim, .uu , .uue, or .xxe extension.

It is written in the Microsoft Visual Basic (VB) programming language and is compressed with UPX.

Antivirus Protection Dates

  • Initial Rapid Release version February 03, 2004
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version February 03, 2004
  • Latest Daily Certified version August 09, 2016 revision 001
  • Initial Weekly Certified release date February 04, 2004

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

Writeup By: Yana Liu

Discovered: February 02, 2004
Updated: February 13, 2007 12:16:59 PM
Also Known As: W32/Holar.gen@MM [McAfee], I-Worm.Holar.f [Kaspersky]
Type: Worm
Systems Affected: Windows


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

  1. Displays a fake message:




  2. May create a folder, %Windir%\Sys32s, and copy itself as %Windir%\Sys32s\ZaCker.exe with attributes set to Read-only, Hidden, and System.


    Note: %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.

  3. Copies itself as %System%\MizZabbat32.exe.


    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).

  4. May create the following files:
    • %System%\Syschk.exe: (With attributes may set to Read-only, Hidden, and System. This is the worm's propagation component.) 29,183 bytes
    • %System%\Smtp.Ocx: (An SMTP library. This file is not viral by itself.) 25,736 bytes
    • %System%\Runhelp.cab: (Which contains a file runhelp.inf. This file is not viral by itself.) 6,323 bytes
    • %Windir%\Sys32s\Runhelp.cab: (With attributes set to Read-only, Hidden, and System.) 6,323 bytes
    • %Windir%\Web\Folder.htt: (With attributes is set to Hidden and Archive.) 15,483 bytes

  5. May add a value:

    "SystemChecker"="%System%\Syschk.exe"

    to the registry key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrenVersion\Run

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

  6. May add a value:

    "Cya"

    to the registry key:

    HKEY_CURRENT_USER

  7. Retrieves email addresses from the files in the current user's Temporary Internet Files folder, Yahoo Messenger, Microsoft Outlook address book, and files whose extensions are .asf, .avi, .doc, .jpg, .mdb, .mpe, .mpeg, .mpg, .pps, .ram, .rar, or .xls.

  8. Uses its own SMTP engine or Outlook to send itself to all the email addresses it finds.

    The worm may spoof the From: field. The email message has a randomly selected subject line, which may also be the attachment name. The attachment has a .bhx, .exe, .hqx, .mim, .uu , .uue, or .xxe, extension. The message body is one of the following:
    • <blank>
    • hey
      Check this out ;)
    • Hey
      I thought you trusted me but ...
      i haven't ever thought i should send u my briefcase to gain ur Trust .
      Have it all :) bye
    • Hey Wussap?
      Here is the Emmy ;) Dont tell Sam abt it
      Cya
    • Another one?
    • Heyyyy
    • I lost the other email , anyway i sent u all u need
      Cya
    • Hey
      i have just got it , plz tell me if u need more.
      bye
    • Heyyyyyyyy Lola Wussaaap??
      I forgot to tell u , the other file is with Sam:) bye
    • YO DUMP , IM SICK OF UR EMAILS , IF U LOSE IT AGAIN I WONT GIVE IT TO U, SAVE IT
      BYEEE
    • Hey wussap?
      i lost Sara's Email plzz send this file to her :)
      and tell her i can't be online tonight
      Bye
    • heyyy
      I can't be online tonight :(
      anyway , i sent u something u r gonna love ;)
      cya tomorrow
    • Hi
      i just wanted to say sorry for last night
      and .. i wish u accept this as an apology
      bye dear
    • elegant ppl should satisfy thier taste with elegant things ;)
      Wait for more :)
    • I've got your email , but you forgot to upload the attachments.
      Don't be selfish , i sent you all the files i have, send me anything :(
      bye
    • heyyyy
      i tried many times to send u this email but ur account was out of storage as i think
      any way , make sure that i didn't and i won't forget u :)
      Cya Forgotten :P
    • i thing the subject is enough to describe the attached file !
      check it out and replay your opinion
      Cya
    • Hiiiiiii
      i've got this surprise from a friend :)
      it really deserves a few minutes of your time.
      Bye
    • Never mind !
    • Attatchments
    • See the attatched file
    • you seem to be mad @ me coz i didn't send u anything for along time,
      i didn't forget u , but i was kinda busy , i've got all of ur emails
      thanx :) and i hope u accept this one as an apology.
    • gift :)
    • Surprise!
    • Hi
      i'm fine , thanx for asking :)
      and thanx for the nice attachements.
      but unfortunately, i don't remember you
      i will be waiting for u emaill to remind me of your self.
      Hummm , i hope u accept this show as an apology.
      bye
    • save it for hard times
    • Happy Times :)
    • Useful
    • Very funny
    • hey wuts up?
      i found this amazing file in my Recycled , i know u love this kind of things ;)
      cyaaa
    • you have to see this!
    • amazing!



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: Yana Liu

Discovered: February 02, 2004
Updated: February 13, 2007 12:16:59 PM
Also Known As: W32/Holar.gen@MM [McAfee], I-Worm.Holar.f [Kaspersky]
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 as W32.Galil.F@mm.
  4. Delete the values that were added to the registry.
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:
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. 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. 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.F@mm, click Delete.

4. 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:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value:

    "SystemChecker"="%System%\Syschk.exe"

  5. Navigate to the key:

    HKEY_CURRENT_USER

  6. In the right pane, delete the value 

    "Cya"

  7. Exit the Registry Editor.


Writeup By: Yana Liu