In this research paper it should be focusing on the currently trending issue Advanced Persistent Threats (APT), which use sophisticated techniques to break into an organization and clandestinely steal valuable data from targeted companies causing severe harm to their business. This research paper should present a detailed literature review on the current state of the art and provide a most optimal solution to tackle these outbreaks. Furthermore, this paper should outline a complete overview of the APT lifecycle and possible detection techniques in early and later stages of the attack. Apart from this, the paper should also focus on several APT attacks that occurred in the past. This report should conclude with a comprehensive study of industry best standards to protect organizations from APT attacks along with an incident response plan.