Picus Security's Blue Report 2026 analyzes over 338 million attack simulations in real customer environments, revealing that prevention effectiveness varies significantly by attack technique and method. Signature-based controls block known attack tools effectively at the perimeter but fail to detect quieter behavioral variants inside the network. For instance, Mimikatz credential dumping via LSASS memory is blocked 94% of the time, but alternative methods like reading LSA Secrets from the registry are blocked only 3%. Overall, perimeter controls block 69% of attacks, but internal controls block only 37% of post-compromise actions. The report distinguishes between IOC-based testing (recognizing known bad artifacts) and behavioral, TTP-based testing (stopping attacker actions regardless of method). It advocates for behavioral validation to uncover gaps in detection and prevention, recommending automated tools to test multiple behavioral variants of attacks. The findings indicate that relying solely on signature-based detection provides a dangerously incomplete security posture.

The impact is a significant gap in security coverage where quieter, less conspicuous variants of known attack techniques bypass existing controls. This results in attackers being able to obtain credential material and perform post-compromise actions with much higher success rates than signature-based prevention metrics suggest. Perimeter defenses are less effective against unknown or modified attack variants, and internal controls block less than half of attacker actions once inside the network. This gap increases the risk of credential theft, lateral movement, and data collection by adversaries, potentially leading to severe breaches despite apparently adequate prevention scores based on known signatures.

The vendor advises that relying solely on signature-based detection is insufficient. Organizations should implement behavioral, TTP-based testing to validate that controls stop attacker actions by any route, not just known procedures. Automated behavioral validation tools, such as Picus Swarm, can orchestrate multiple attack variants to test control effectiveness comprehensively. This approach enables organizations to identify and address gaps in detection and prevention coverage. No new controls or stack expansion is necessarily required; rather, existing controls should be tested and validated against behavioral variants to ensure coverage. Patch status is not applicable as this is a security posture and testing methodology report, not a specific vulnerability.