Adhering to the usual rules of not opening an e-mail attachment or clicking on a link that comes from an unknown source is one of the best ways to combat malicious code.
Viruses
A virus is a small application, or string of code, that infects software. The main function of a virus is to reproduce and deliver its payload, and it requires a host application to do this.
A macrovirus is a virus written in one of these macro languages and is platform independent.
A stealth virus hides the modifications it has made to files or boot records.
A polymorphic virus produces varied but operational copies of itself.
A multipart virus (also called multipartite virus) has several components to it and can be distributed to different parts of the system.
tunneling virus, attempts to install itself “under” the antimalware program.
Worms
Worms are different from viruses in that they can reproduce on their own without a host application, and are self-contained programs.
Rootkit
The rootkit is just a set of tools that is placed on the compromised system for future use.
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