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  3. W32.Vote.gen@mm

W32.Vote.gen@mm

Risk Level 2: Low

Discovered:
September 27, 2001
Updated:
February 13, 2007 11:46:51 AM
Type:
Worm
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.Vote.gen@mm is a mass-mailing worm written in the Visual Basic language. It requires the file Msvbvm50.dll to execute.

When executed, the worm will attempt to email itself to all contacts in the Microsoft Outlook address book. The email will appear as follows.

Subject: Fwd:PEaCe BetWeen AmeRiCa And ISLaM !

Message:
Hi
iS iT A waR Against AmeriCa Or IsLaM !?
Let's Vote To Live in Peace!

Attachment: WTC.EXE
In addition, the worm inserts three .vbs files on the system:
  • \%Windows%\MixDaLaL.vbs
  • \%Windows\System%\WaiL.vbs
  • \%Windows\System%\DaLaL

NOTES:
  • %Windows% is a variable. The worm locates the \Windows folder (by default this is C:\Windows or C:\Winnt) and copies itself to that location.
  • %Windows\System% is a variable. The worm locates the \Windows\System folder (by default this is C:\Windows\System or C:\Winnt\System32) and copies itself to that location.

In addition, the worm will attempt to download and execute a file. Norton AntiVirus detects this file as Backdoor.Trojan.

What the inserted files do
MixDaLaL.vbs
MixDaLaL.vbs is a Visual Basic Script file that is inserted in the \%Windows% folder. This file is the same as in W32.Vote.A@mm. This file is executed by the worm. As the file is executed, it looks through all folders on all fixed drives and network drives for files with the extensions .htm or .html. If such files are found, they are overwritten with the message

AmeRiCa ...Few Days WiLL Show You What We Can Do !!! It's Our Turn >>> ZaCkEr is So Sorry For You

DaLaL.VBS
This file is inserted in the \%Windows\System% folder. It is not executed by the worm. Instead, the value

ZaCker = \%Windows\System%\DaLaL.vbs

is added to the registry key

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run

so that the file is executed when you start Windows.

When the file is executed at the next restart, it performs the following actions:
  • It creates or overwrites the file C:\Autoexec.bat. Inside the file there will be a command that formats the C drive. The Autoexec.bat file is executed on Windows 95/98/Me and DOS systems as the computer is booted up.
  • Next, the key

    ALWaiL = \%Windows\System%\WaiL.vbs

    is added to the registry key

    HKEY_LOCAL_MACHINE\Software\
    Microsoft\Windows\CurrentVersion\Run

    so that the file is executed when you start Windows.
  • Finally, it displays the message



    After displaying the message, the worm attempts to shut down Windows. If you restart the computer and you are running Windows 95/98/Me, it is likely that drive C will be reformatted.

WaiL.VBS
If drive C was not reformatted after DaLaL.vbs was executed, WaiL.vbs will be executed. This script simply attempts to delete all files in the %Windows% folder. Once it has finished, it displays the message


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.
Summary| Technical Details| Removal

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