Trojan Horses

A Trojan horse, or Trojan, is a non-self-replicating type of malware which appears to perform a desirable function but instead drops a malicious payload, often including a backdoor allowing unauthorized access to the target's computer. These backdoors tend to be invisible to average users. Trojans do not attempt to inject themselves into other files like a computer virus. Trojan horses may steal information, or harm their host computer systems. Trojans may use drive-by downloads or install via online games or internet-driven applications in order to reach target computers. The term is derived from the Trojan Horse story in Greek mythology because Trojan horses employ a form of “social engineering,” presenting themselves as harmless, useful gifts, in order to persuade victims to install them on their computers.

Some operations performed by Trojan Horses are as follows:

• Modification or deletion of files
• Keystroke logging
• Watching the user's screen
• Viewing the user's webcam
• Controlling the computer system remotely
• Anonymizing remote third-party internet viewing