Voltan is an Internet worm spreading via the email addresses stored in Windows address books.
Messages to beware of have the following body text:
There is a link to a web site where a copy of the Voltan worm resides.
Additionally, the worm replaces the screen saver with a scrolling text line stating:
The worm is a Windows executable file about 36 KB in size when compressed with ASPack. The uncompressed size is about 70KB. Voltan is unable to function in the operating system environments of Windows 95, 98, ME, and NT4.