What class of malicious software relies on deceiving users into installing it by posing as a legitimate utility, then silently opens a hidden backdoor once the program is executed?
Logic bomb
Computer worm
Side-channel attack
Trojan
Malware that masquerades as harmless or useful software to trick users into installing it is known as a Trojan. Once launched, a Trojan does not attempt to replicate or spread by itself; instead, it carries out the hidden payload such as opening a backdoor that allows an attacker remote access. A computer worm, by contrast, is self-replicating and travels across networks without user assistance. A logic bomb is dormant code that activates only when specific conditions are met, and a side-channel attack gathers information from hardware leakages like timing or power use rather than installing software. Therefore, only a Trojan fits the scenario described.
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