Discuss an example of threats in computer software

Assume only one attack out of the above list i.e., the virus attack. Though the present anti-virus software solutions can detect and clean as many as 50000 viruses, it becomes extremely difficult to detect a new virus numbered 50001. The recent happenings of I Love You, Love Bug, Dinner Party with CEO, etc., viruses have virtually spread all over the world not leaving any type of system.  As reported at many places, the casualty figure has been extremely high and the organisations could not come to a stable state till date. It would be notable that even for developing an antidote it would take many man-hours of research and testing before the things are set right, and in the meanwhile the virus would have done all the damage it can.

Numerous corporate offices do their day-to-day work on-line. A simple task like sending messages, circulars, interview, meeting, promotions, etc., all are dealt with on the corporate Intranet. Assume that a new virus enters the network passing through the stringent anti-viral tests successfully (and of course, undetected). The story starts then and ends in few more moments.