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.

VBS.Chistes@mm

VBS.Chistes@mm

Discovered:
13 January 2003
Updated:
13 February 2007
Also Known As:
I-Worm.Sharpei.a (AVP), VBS/Generic@MM (NAI)

VBS.Chistes@mm is a Visual Basic Script (VBS) worm that uses Microsoft Outlook to spread itself.

Definitions dated prior to January 14, 2003 detect it as Bloodhound.VBS.Worm.

Antivirus Protection Dates

  • Initial Rapid Release version 14 January 2003
  • Latest Rapid Release version 28 September 2010 revision 054
  • Initial Daily Certified version 14 January 2003
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date 15 January 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

VBS.Chistes@mm is a mass-mailing worm that uses Microsoft Outlook to spread. When it is executed, the worm sends itself to all the addresses in the Outlook Address Book. The email has the following characteristics:

Subject: FDW:CHISTES PICANTES!
Attachment: Chistes.bat

The batch file drops itself into the root of drive C and creates the VBS file, which is used for the mass mailing.

The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
  1. Update the virus definitions.
  2. Run a full system scan and delete all the files detected as VBS.Chistes@mm.

For specific details on each of these procedures, read the following instructions.

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 the 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), in the "Protection" section, at the top of this writeup.
  • 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), in the "Protection" section, at the top of this writeup.

    The 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.

2. 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 VBS.Chistes@mm, click Delete.


Writeup By: Maryl Magee