Computer Science for IGCSE & O level - The Internet And Its Uses (Section 3 - No. 17)

What is the primary function of a Trojan horse?
To encrypt files and demand ransom.
To self-replicate and spread to other computers.
To disguise itself as legitimate software.
To monitor a user's online activity.

Explanation

Trojan horses pretend to be legitimate software to trick users into installing malicious code.

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