Welcome to the Virus Encyclopedia of Panda Security.
It steals and sends out confidential information, drops the Elkern.C virus, kills processes and deletes files.
Klez.I is a worm that reaches computers in an e-mail message with a variable subject.
It is very easy to become infected by this worm, as it is automatically activated when the message is viewed through Outlook's Preview Pane. It does this by exploiting a vulnerability in Internet Explorer (versions 5.01 and 5.5), which allows e-mail attachments to be automatically run.
Klez.I is very dangerous because:
Klez.I is difficult to recognize, as it reaches the computer in an e-mail message with variable characteristics. Most common subjects are:
Klez.I is characterized by its ability to modify the subjects of the messages it sends out. This makes it particularly difficult to identify the worm as it reaches the computer via e-mail. In order to generate the subjects, it uses the following:
For more information, consult the section Means of transmission.
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