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13 February 2007
Risk Impact:
File Names:
Systems Affected:


When Joke.Knijpme is executed, it displays a window containing female breasts. The window is titled "Knijp me."


The presence of one or more windows titled "Knijp me."


This joke program consists of one file that must be manually executed.

Antivirus Protection Dates

  • Initial Rapid Release version 02 October 2014 revision 022
  • Latest Rapid Release version 11 August 2018 revision 004
  • Initial Daily Certified version 18 August 2003 revision 002
  • Latest Daily Certified version 12 August 2018 revision 001
  • Initial Weekly Certified release date 18 August 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When Joke.Knijpmeprogram is executed, it displays a window containing female breasts.

If you try to close the windows using the mouse, when you approach the window with the cursor, the window will move away from the cursor.

If you are able to click the "X" window-closing button, which is possible if the cursor approaches the "X" from the top of the window, this joke program will open a second, identical window.

Restarting the computer terminates this joke program.

  1. Update the virus definitions.
  2. Run a full system scan and delete all the files detected as Joke.Knijpme.
For specific details on each of these steps, 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 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. Scanning for and deleting the infected files
  1. Start Norton AntiVirus and make sure that it is configured to scan all the files. For more information, read the document, "How to configure Norton AntiVirus to scan all files."
  2. Run a full system scan.
  3. If any files are detected as infected with Joke.Knijpme, click Delete.