A malware which acts like a spy in computer system is called ___?

A Trojan horse, or Trojan

Software, such as viruses, worms and Trojan horses, that has a malicious intent, is known as Malware.

Software is considered to be malware based on the perceived intent of the creator rather than any particular features. Malware includes computer viruses, worms, trojan horses, spyware, dishonest adware, scareware, crimeware, most rootkits, and other malicious and unwanted software or program.

Malware (a portmanteau for malicious software) is any software intentionally designed to cause damage to a computer, server or computer network. Malware does the damage after it is implanted or introduced in some way into a target’s computer and can take the form of executable code, scripts, active content, and other software.

Explanation:

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