ITPEC FE Morning October 2021 Question 35

A malicious program that presents itself as legitimate — a Trojan horse gets in by disguise.

Like the wooden horse of Troy, it looks like a useful program, so the user installs and runs it willingly, and the hidden payload (a backdoor, keylogger or data theft) acts once inside. Unlike a virus or worm, a Trojan does not replicate itself; it depends on the user letting it in.

Answer (b)

Why not others:

• •(a) — a brute force tool tries candidate passwords one after another; it is an attack tool, not a disguised program
• •(c) — a malicious user is a person (an attacker or insider), whereas a Trojan horse is software
• •(d) — a tool that recovers encrypted passwords is a password cracker, with no disguise involved

Key rule: Malware is named by how it spreads or behaves: a Trojan disguises itself, a virus attaches to other files, a worm spreads over the network by itself.

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