Discovered: May 19, 2003
Updated: February 13, 2007 12:01:24 PM
Also Known As: W32/Gant.b@mm [McAfee]
Systems Affected: Windows
W32.HLLW.Redist@mm is a mass-mailing worm that attempts to email itself to all the contacts in the Windows Address Book. The email will have a subject line and attachment chosen from a predetermined list. The attachment will have a .exe, .pif, or .scr file extension. The worm also attempts to spread itself through the KaZaA file-sharing network.
W32.HLLW.Redist@mm attempts to steal information from an infected computer and send it to a specified email address. The worm will attempt to terminate the processes of various programs, including antivirus and firewall programs.
This threat is written in the Microsoft Visual Basic (VB) programming language and is compressed with UPX. The VB run-time libraries are required to execute W32.HLLW.Redist@mm.
Antivirus Protection Dates
- Initial Rapid Release version May 19, 2003
- Latest Rapid Release version September 28, 2010 revision 054
- Initial Daily Certified version May 19, 2003
- Latest Daily Certified version September 28, 2010 revision 036
- Initial Weekly Certified release date May 21, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
When W32.HLLW.Redist@mm runs, it does the following:
- Copies itself as:
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.
- Adds the value:
"Outsider"="W32/Outsider by Zed"
to the registry key:
- Adds the value:
to the registry key:
- Attempts to steal information and save it in the following files:
NOTE: These files are not viral by themselves, and thus, Symantec Security Products do not detect them as such. Manually remove these files.
- Emails the aforementioned files to the following email address:
- Searches for the folders:
- C:\Program Files\KMD\My Shared Folder
- C:\Program Files\KAZAA\My Shared Folder
- C:\Program Files\Kazaa Lite\My Shared Folder
- C:\Programmer\KMD\My Shared Folder
- C:\Programmer\KAZAA\My Shared Folder
- C:\Programmer\Kazaa Lite\My Shared Folder
- C:\Program\KMD\My Shared Folder
- C:\Program\KAZAA\My Shared Folder
- C:\Program\Kazaa Lite\My Shared Folder
- C:\Programme\KMD\My Shared Folder
- C:\Programme\KAZAA\My Shared Folder
- C:\Programme\Kazaa Lite\My Shared Folder
- C:\Programmi\KMD\My Shared Folder
- C:\Programmi\KAZAA\My Shared Folder
- C:\Programmi\Kazaa Lite\My Shared Folder
- C:\ProgramFiler\KMD\My Shared Folder
- C:\ProgramFiler\KAZAA\My Shared Folder
- C:\ProgramFiler\Kazaa Lite\My Shared Folder
- C:\Programas\KMD\My Shared Folder
- C:\Programas\KAZAA\My Shared Folder
- C:\Programas\Kazaa Lite\My Shared Folder
- C:\Archivos De Programma\KMD\My Shared Folder
- C:\Archivos De Programma\KAZAA\My Shared Folder
- C:\Archivos De Programma\Kazaa Lite\My Shared Folder
- If the worm finds any of the above folders, it will copy itself to each location as one of the following:
- Johnny English (Movie) - Full Downloader.pif
- Gladiator (Movie) - Full Downloader.pif
- SwordFish (Movie) - Full Downloader.pif
- MSN Messenger Password Stealer.pif
- Norton AntiVirus <XXXX> Full.exe
- Hotmail Password Cracker.pif
- Jasc Paint Shop Pro 7 (Full).pif
- Microsoft Office <XXXX> Full.exe
NOTE: <XXXX> is the year of the system date. For example, in year 2003, the value will be 2003.
- Attempts to terminate the following processes:
- Displays the following fake message:
Title: Error Starting Program
Message: A required .DLL file, MSVBVM60.DLL, was not found.
- Attempts to close any window whose title is Registry Editor.
Email Routine Details
The worm uses Microsoft Outlook to email itself to all the contacts in the Windows Address Book. The email message has the following characteristics:
Subject : Modem booster
Attachment : ModemBooster.exe
I have a fairly slow modem, that is, until I installed the file in the attachments!
This program is a "Modem booster", it can make your internet connection go at most 2x faster :)
Subject : Better than WinZip?
Attachment : FileCompress.exe
Body : Try this file compressor that I downloaded from the net yesterday!
I have compressed some files, and it makes them at least 3 times smaller!
The installation file should be in the attachments as "FileCompress.exe"
Subject : Warp ScreenSaver
Attachment : WarpScreen.scr
Body : Try this warp ScreenSaver in the attachments!
Subject : Program
Attachment : Winprg32.pif
Body : Here is that program that you asked for yesterday.
Subject : Fire ScreenSaver
Attachment : FireScreen.scr
Body : Hello,
Check out this ScreenSaver of fire!
I think that it is one of the best ScreenSavers that I have ever seen!
Subject : Program
Attachment : Msprg32.pif
Body : Here is a copy of that program that everyone is asking for.
Please don't delete it, because I might not send it to anyone else.
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.
The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
- Update the virus definitions.
- Do one of the following:
- Windows 95/98/Me: Restart the computer in Safe mode.
- Windows NT/2000/XP: End the Trojan process.
- Run a full system scan and delete all the files detected as W32.HLLW.Redist@mm.
- Reverse the changes that the Trojan made to the registry.
- Delete the files:
1. 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.
2. Restarting the computer in Safe mode or ending the Trojan process
- Windows 95/98/Me
Restart the computer in Safe mode. All the Windows 32-bit operating systems, except for Windows NT, can be restarted in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
To end the Trojan process:
- Press Ctrl+Alt+Delete once.
- Click Task Manager.
- Click the Processes tab.
- Double-click the Image Name column header to alphabetically sort the processes.
- Scroll through the list and look for Msctrl32.scr.
- If you find the file, click it, and then click End Process.
- Exit the Task Manager.
- Start your Symantec antivirus program and make sure that it is configured to scan all the files.
- For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files."
- For Symantec AntiVirus Enterprise products: Read the document, "How to verify that a Symantec Corporate antivirus product is set to scan All Files."
- Run a full system scan.
- If any files are detected as infected with W32.HLLW.Redist@mm, click Delete.
4. Reversing the changes made to the registry
CAUTION : 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.
- Click Start, and then click Run. (The Run dialog box appears.)
- Type regedit
Then click OK. (The Registry Editor opens.)
- Navigate to the key:
- In the right pane, delete the value:
- Delete the registry key
- Exit the Registry Editor.
5. Deleting the files
Using Windows Explorer, locate and delete these files:
Writeup By: Robert X Wang