Which among the following is a malicious software?

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UPSC CDS-I 2025 (General Studies) Official Paper (Held On: 13 Apr, 2025)
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  1. Hacking
  2. Password Cracking
  3. Trojan Horse
  4. Firewall

Answer (Detailed Solution Below)

Option 3 : Trojan Horse
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UPSC CDS 01/2025 General Knowledge Full Mock Test
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Detailed Solution

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The correct answer is Trojan Horse.

Key Points

  • A Trojan Horse is a type of malicious software (malware) that appears legitimate but can take control of your computer.
  • Trojan Horses are used by cybercriminals to steal sensitive data, access systems, or launch attacks.
  • Unlike viruses, Trojans do not self-replicate; they rely on the user to execute them.
  • Common methods of infection include emails, downloads, and software vulnerabilities.
  • Once activated, Trojans can perform tasks like keylogging, backdoor access, or ransomware attacks.

Additional Information

  • Malware
    • Malware is any software intentionally designed to cause damage to a computer, server, or network.
    • Types of malware include viruses, worms, ransomware, spyware, adware, and Trojans.
    • Malware can disrupt operations, steal data, or exploit systems for personal or financial gain.
  • Firewall
    • A firewall is a network security device that monitors and controls incoming and outgoing network traffic.
    • Firewalls help protect systems from unauthorized access by blocking harmful traffic.
    • Unlike malware, firewalls are defensive tools rather than malicious software.
  • Hacking
    • Hacking refers to the unauthorized access to or manipulation of computer systems or networks.
    • It is a method, not a type of software.
    • Ethical hacking is the legitimate use of hacking techniques to improve security systems.
  • Password Cracking
    • Password cracking is the process of recovering passwords from data stored in or transmitted by a computer system.
    • It is a technique used by hackers to gain unauthorized access, not a form of software.

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Last updated on Jul 7, 2025

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