What potential threat does a Trojan pose after it is installed on a computer?

• A. Displaying unwanted advertisements
• B. Slowing down computer speed
• C. Allowing a hacker to take control of the computer
• D. Transmitting viruses to other computers

Answer: (C)

A Trojan is a type of malware designed to mislead users about its true intent, often disguised as legitimate software. Once installed on a computer, it can create significant security vulnerabilities, allowing a hacker remote access and control over the infected system. This control can enable the hacker to conduct various malicious activities, such as stealing sensitive information, installing more malware, or using the infected computer for additional attacks.

In contrast, while displaying unwanted advertisements, slowing computer speed, and transmitting viruses to other computers can certainly occur with other types of malware or as secondary effects, the primary and most concerning threat posed by Trojans remains their ability to grant unauthorized access to cybercriminals. This access is fundamental to many other threats that can stem from the initial Trojan infection, making it a primary concern in cybersecurity.