Shankar's Virus (also known as W97M.Marker.o) is a Polymorphic Computer Virus that infects Microsoft Word documents and templates. It was discovered June 3, 1999. It is believed to have been brought into existence by a computer programmer named Sam Rogers.
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The virus hooks the Word event handler to close documents in order to run its code.
This virus infects documents and templates when you open a document. It makes the following modifications to the infected documents: [1]
Title: Are You surprised ? Subject: Birthday Author: LSK Category: You Are Infected Keywords: Birthday Comments: Shankar's Birthday falls on 25th July. Don't Forget to wish him
Also, when opening or closing a Word Document, a dialogue box pops up displaying this string text "Did you wish Shankar on his birthday?"