W32.HLLW.Niden is a worm that attempts to spread itself through file-sharing networks. It also attempts to mass-mail itself to all the contacts in the Windows Address Book. However, due to bugs in the code, the mass-mailing routine does not work properly.
Furthermore, it attempts to disguise itself as Norton Anti-Virus 2003 by using the following icon:
When W32.HLLW.Niden is executed, it displays a fake error message, titled "Error Starting Application." The worm also attempts to delete files belonging to various antivirus programs.
W32.HLLW.Niden is written in the Microsoft Visual Basic (VB) programming language. The VB run-time libraries are required to execute W32.HLLW.Niden.
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