Which type of malware could disable a local software firewall through a spreadsheet add-on?

A Trojan horse is a type of malware that often masquerades as a legitimate software or file to trick users into installing it. In this case, a spreadsheet add-on could be designed to appear useful or benign, leading users to enable it. Once installed, a Trojan horse can perform malicious activities, such as disabling security features like a local software firewall. Unlike worms, which can self-replicate and spread independently, Trojans rely on user interaction to infiltrate systems. Ransomware is specifically designed to encrypt files and demand payment for their release, while adware primarily focuses on displaying unwanted advertisements rather than directly compromising security features. Thus, the scenario describes the characteristics of a Trojan horse perfectly, as it manipulates user trust to disable protective systems.