Trojan Horse is best described as which of the following?

• A. A program that replicates itself across networks
• B. A program in which the malicious or harmful code is contained inside apparently harmless programming or data
• C. A program that deletes files when run
• D. A program that encrypts files for ransom

Answer: (B)

A Trojan Horse hides malicious code inside something that looks legitimate, such as a normal program or data file. The attacker relies on deception to get you to run or open it, allowing the hidden payload to execute. Once active, it can install backdoors, steal data, or take control of the system. It does not spread automatically to other machines like a worm, and it isn’t primarily about deleting files or demanding ransom to recover them—that’s the domain of a wiper or ransomware. The essential idea is that the harmful code is concealed inside something that appears harmless.