One such email worm is the Win32 virus that modifies files so that it can automatically attach itself and an image of a fireworks display to your outgoing emails. It first showed up in 2005 and is displayed in incoming emails as an .exe file and is only activated if the file is opened. This Win32 virus automatically attaches itself to newsgroup or e-mail messages. The attachment is titled HAPPY99.EXE. You must open the attachment (click on it) in order to activate the virus. It does not show up on outgoing emails, so the person who sent it does not usually know they sent a virus with their email.
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