Symantec Endpoint Protection 14.3 Build 558 [2021] May 2026

This is SEP’s behavioral detection engine. In Build 558, SONAR received enhanced heuristic rules to detect ransomware patterns like rapid file encryption and volume shadow copy deletion. SONAR operates without requiring constant cloud connectivity, a crucial feature for isolated networks (e.g., industrial control systems).

Build 558 requires specific configurations to function optimally. symantec endpoint protection 14.3 build 558