Brook is a type of malware that infects computers by exploiting vulnerabilities in the system or by tricking users into downloading and executing malicious files. Once a computer is infected with Brook, it can steal sensitive information, such as login credentials and financial data, as well as disrupt normal system operations. Brook can spread through infected email attachments, compromised websites, or through network vulnerabilities. It is important for users to regularly update their antivirus software and practice safe browsing habits to prevent infections from Brook and other malware.