A self-replicating program that produces its own code by attaching copies of itself to other executable codes, and operates without the knowledge or desire of the user is what type of malicious program?

Virus is the correct answer  of this question.

Explanation:

A virus is a form of malicious that integrates its virus software to multiply by alteration applications and programs.By replicating malicious code the machine gets infected.It can self-, inject itself into other programs or files, and then infect them.

A virus is an adware program that is loaded without user knowledge into a user's device and performs malicious acts.virus damaged the computer system.