What is the KLEZ virus?

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Klez is a worm that spreads via the Internet by attaching itself to mass-mailed emails using SMTP to pass itself along. The worm virus itself is a Windows PE EXE file of about 65Kb in size and is written in Microsoft Visual C++. The subject line of the email carrying the virus payload is randomly selected from a list of possible choices.

The email message “From:” field will contain either one of the addresses found in a search of address books and files on the computer or an address taken from a list inside the virus body.


When the virus was released, millions of email messages results and were sent around the world. This caused some messaging servers to fail and cripple internal company communications systems. Some claims were made that this virus caused billions of dollars of administrator’s and user’s time in dealing with all the errant messages, recovering failed systems and opportunities lost as a result of the failed communications.

Those using GMS Anti-Virus were quickly protected from the virus thanks to heuristics and automatic updates. GMS Anti-Virus customers were not affected the way other organizations were, and continue to be. This illustrates the power of integration within GMS and its low cost of ownership.

Is my computer infected by Klez.I?

  • First of all, check if you have received an e-mail message with the characteristics described in the section Means of transmission.
  • In order to make absolutely sure that Klez.I has not affected your computer, you have the following options:
  • Carry out a full scan of your computer using Panda Antivirus, after checking that it is updated. If it isn’t and you are a registered Panda Software client.
  • Check the computer with Panda ActiveScan, Panda Software’s free, online scanner, which will quickly detect any possible viruses.

How to remove Klez.I?

Above all, if you have received a message with any of the characteristics described in the section Means of transmission, do not view the message through the Preview Panel, do not run the attached file and delete the message, making sure that you also delete it from the Deleted Items folder.

  • Then, if your antivirus detects Klez.I during the scan, it will automatically offer you the option of deleting it. Do this by following the program’s instructions.
  • As an extra precaution run the free utility Panda QuickRemover, which will automatically repair any damage that Klez.

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