This paper is an in-depth analysis of Virtualization Software, specifically – Oracle VM VirtualBox. Here, we analyze the existing system and determine the first two phases of the Secure Software Development Process. Here we go over the requirements elicitation, the architecture, and design phases of the secure software development lifecycle. We selected SQUARE methodology to identify the security requirements. Also, we used the Microsoft Threat Modeler tool for threat modeling. Finally, we identified major secure design patterns.