The virus is a file or program that is run by the hacker from a remote location on the personal computer is known for replacing and rearranging of confidential data. Said to infect the computer once installer or downloaded from another unknown source.
This software is created by using some algorithms and the hackers use a series of programming codes that can destroy and corrupts the entire processing and shutdown the computer fro good by sabotaging the operating system.
First, the infection mechanism is developed in parts. The logic bomb is triggered after which the payload actual body of the virus is dropped in dominant, propagation, triggering and execution phase.
Let me simplify my explanation by stating the general rule of risk and return that "the higher the risk, the higher the return". So in this question, the lower the project portfolio risk, the lower the correlation in project returns over time.