This report, prepared for ITech Company, examines the pervasive threat of ransomware attacks. It begins with an introduction to ransomware, detailing its impact on businesses and society, and emphasizing the growing risks in network security. The report then delves into three prominent ransomware variants: WannaCry, Locky, and Spider, outlining their specific characteristics and methods of operation. A core section elucidates the working mechanism of ransomware, explaining how it infiltrates systems, encrypts data, and demands ransom. Finally, the report assesses the potential threats posed by ransomware, including data breaches, financial losses, and system disruptions, concluding with a call for robust security strategies and employee training to mitigate these risks. The report includes Harvard style references.