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VBS.Chick.B@mm

VBS.Chick.B@mm

Discovered:
25 March 2002
Updated:
13 February 2007


VBS.Chick.B@mm is a minor variant of VBS.Chick@mm . The changes are in the email distribution and the file name that is sent.

Antivirus Protection Dates

  • Initial Rapid Release version 26 March 2002
  • Latest Rapid Release version 28 September 2010 revision 054
  • Initial Daily Certified version 26 March 2002
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date 27 March 2002
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

As with VBS.Chick@mm, this threat is created in compiled HTML format (.chm). It would be received as email with the following characteristics:

To: (The message is sent to all contacts except group listings that are in the infected computer's address book.)

Subject: RE:Nuevo video de Caifanes

Message:
Caifanes regresa y te muestra su nuevo video musical ...
Regards,
<Name of the registered user of the infected computer>

Attachment: Caifanes.chm (10,651 bytes)

The following is an example from a test infection system at the Symantec Security Response lab:



If the file Caifanes.chm is run, it does the following:

It display the HTML text:

Permite Active X para ver el nuevo video de Caifanes
Gratis nuevo video de Caifanes !!!!

If you allow ActiveX to run, the script copies itself to the \Windows folder and then executes the script instructions to do the following:
  1. It checks for the Mirc.ini file on drives C, D, and E. If it finds the Mirc.ini file, it overwrites the file with instructions to distribute \%Windows%\Caifanes.chm.
  2. It checks the registry key

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\chm

    for a null value, and if the value is null, it runs the previously mentioned email routine. It then sets the value of that registry key to 1.
  3. Next, it displays the message

    Error al mostrar el video musical permite la interacción Active X para ver el video. No se encuentra conexión a internet.
    Consulta tu proveedor
  4. It displays more text in the original .chm window:

    Cuando me muera y me tengan que enterar
    quiero que sea con una de tus fotografías
    para que no me dé miedo estar abajo
    para que no se me olvide como es tu cara
    para imaginar que estoy contigo
    y sentirme un poquito vivo.

    Mátenme porque me muero
    mátenme porque me muero
    mátenme porque me muero
    mátenme porque me muero
    esta enfermedad es incurable
    esta enfermedad ni con un valium, no.

    Cuando me muera y me tengan que enterrar
    quiero que sea con dulces y no con piedras
    por si alguna vez me buscas
    no estaré eternamente lejos
    como para darte sólo flores
    te guardare mil estrellas.

    Mátenme porque me muero
    mátenme porque me muero
    mátenme porque me muero
    mátenme porque me muero
    esta enfermedad es incurable
    esta enfermedad ni con un valium, no.

    Kuasanagui inc. 07 de Marzo de 2002
No other actions are performed against the system.


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.

Obtain the most recent virus definitions. There are two ways to do this:
    • Run LiveUpdate. LiveUpdate is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
    • Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions have undergone full quality assurance testing by Symantec Security Response. They are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.

      Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.
  1. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files. For instructions on how to do this, read the document How to configure Norton AntiVirus to scan all files.
  2. Run a full system scan.
  3. Delete all files that are detected as VBS.Chick.B@mm.


Writeup By: Patrick Nolan