This is Gigabyte's Coconut virus/worm in action. You can find detailed descriptions of this and similar programs at http://virus.wikidot.com and this particular one is at http://virus.wikidot.com/coconut.
This video was made on a Windows 2000 virtual machine using Sun's VirtualBox version 2.0.2. I used CamStudio to record the screen.
The screen of the virtual machine it runs on has been resized so you can see what is happening.
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Email-Worm.Win32.Conut or Conut (known as Coconut) is a worm with a viral component that has...