What type of attack involves a harmful program that can control a system and cause damage?

The correct answer is Trojan Horse Attack. This type of attack involves a malicious program that masquerades as a legitimate or beneficial application. Once the user installs or runs the program, the attacker can gain unauthorized access to the system, control it, and potentially cause damage or steal sensitive information. The key characteristic of a Trojan horse is that it tricks users into executing it, thereby allowing the attacker to manipulate the system and execute harmful actions without the user's knowledge. This differs from other types of attacks, such as viruses that spread by replicating themselves, brute-force attacks that focus on cracking passwords, and phishing attacks aimed at deceiving users into providing personal information. The Trojan horse specifically emphasizes user deception as a means to infiltrate and control the system.