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Due to the blooming of Industrial 4.0 such as internet of things (IoT), cloud computing, industrial IoT (IIoT), and artificial intelligence (AI), with their innovative ideas and opportunities, the cyber attacker's modus operandi against the cyber defense triage is incredible. The genre of advanced persistent threat (APT) actors/group are equipped with sophisticated and substantial resources of tools, techniques, and procedure (TTP) at a breakneck pace. The IoT gadgets such as sensors, intelligent devices, and various rapidly emerging resources with energy, memory, and processing power are exponentially prone to multiple vulnerabilities. The nature of IIoT prompts heterogenous and rapid changes ranging the vulnerabilities from simple to complex attacks. APT menace follows the covert TTPs to target the asset of any organization like the government, military, or financial industry.

In order to focus on the mission and functions of the business of the organizations, cyber resiliency have to play a critical role against the adversaries’ target. The strategy recommended by NIST to reduce the suspect ability of cyber-attacks of the system with the three dimensions such as harden the target, limit the damage to the target and make the target resilient. The threats could be based on cyber and noncyber. The objective is to provide cyber resiliency on the Advanced Persistent Threat (APT), has born with the nature of sophisticated, stealthy, persistent towards target and highly adoptable to the environment. The challenge is to provide cyber resilience to the system from compromising tactics of the adversaries, uncertain in eradication of threat due to its persistent nature, recognizing its adapting ability. The cyber resiliency also links with other disciplines like safety, fault tolerance, privacy, resilience and survivability, reliability and security