It is noteworthy that Cyber-Kill Chain is a circular model, not a linear one. Once an attacker accesses the network, the cybersecurity lifecycle closes and starts again. In addition, despite the methodology uniformity, repeated cyber attacks occur using other techniques and tools. After penetrating the network, attackers turn from an external threat into an insider one, which makes it more difficult to detect and eliminate. Thus, the main goal of internal specialists is thorough cybersecurity lifecycle monitoring and management to break the Cyber-Kill Chain promptly and intervene at the early stages.