The Chief Information Security Officer (CISO) developed a robust plan to address both internal and external vulnerabilities due to an increase in ransomware attacks on the network. However, the…

Blacklisting suspected websites addresses only one potential delivery channel for ransomware and is a symptom of a broader control gap rather than the root cause of a comprehensive plan's failure.

A threat model defines which adversaries, attack vectors, and scenarios are in scope for a security program. If the threat model was not properly vetted, it may have excluded the specific ransomware delivery methods or threat actors actually targeting the organization, causing the controls derived from it to be misaligned with real-world attacks. No matter how robustly a plan is implemented, it will fail if the underlying threat assumptions are inaccurate.

Outdated IDS/IPS signatures are a contributing operational factor but represent a downstream control failure, not the foundational planning failure that would explain a pattern of increasing successful attacks.

A business impact analysis identifies critical assets and recovery priorities for continuity planning but does not directly inform the design of preventive security controls against ransomware.