Threat Explorer

The Threat Explorer is a comprehensive resource consumers can turn to for daily, accurate, up-to-date information on the latest threats, risks and vulnerabilities.



24 November 2000
13 February 2007
Also Known As:

VBS.Jean.A@mm is a worm that spreads via Microsoft Outlook. The worm spreads to the first 50 addresses of every address list and sends an email in German.

The text of the email is as follows:
    Guten Tag,
    es ist bald Weihnachten.
    Und wie sieht's aus mit schönen Geschenken ?
    Hierzu ein Tip vom Weihnachtsmann:
    Unter gibt es die besten Geschenke im Web !
    Das bedeutet absolut stressfreies Einkaufen, schnelle und unkomplizierte Lieferung, riesige Auswahl.
    Also nichts wie hin, und Frohe Weihnachten.

Translated to English, the message reads:
    Good day,
    it is almost Christmas.
    And what's happening with nice gifts ?
    Here is a hint from Santa Claus:
    At you can find the best gifts on the Web!
    That means buying absolutely stressfree, fast and easy delivery, wide variety of items to choose from.
    Alrighty then, let's go for it, and Merry Christmas.

Antivirus Protection Dates

  • Initial Rapid Release version 25 November 2000
  • Latest Rapid Release version 23 March 2017 revision 037
  • Initial Daily Certified version 25 November 2000
  • Latest Daily Certified version 23 March 2017 revision 041
  • Initial Weekly Certified release date pending
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

VBS.Jean.A@mm opens Outlook and iterates through all address lists in the address book. The worm targets the first 50 addresses in each address list, and emails itself to them.

Before sending itself, VBS.JeanA@mm performs a check on the targeted email address to prevent it from being sent to an invalid address.


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.

Delete all files detected as VBS.Jean.A@mm.
Writeup By: Andre Post