Can anyone tell me what this is SONAR Advance Protection and do I need it?
Hi, croningd,
Welcome to our community!
SONAR is a sophisticated, behavior-based engine for detecting malware that's so new it hasn't been identified & added to the definitions files. I would advise you to use it unless/until you encounter a specific reason not to.
From our product's help section:
Symantec Online Network for Advanced Response (SONAR) provides real-time protection against threats and proactively detects unknown security risks on your computer. SONAR identifies emerging threats based on the behavior of applications. SONAR identifies threats quicker than the traditional signature-based threat detection techniques. SONAR detects and protects you against malicious code even before virus definitions are available through LiveUpdate.
SONAR monitors your computer for malicious activities through heuristic detections.
SONAR automatically blocks and removes high-certainty threats. Norton Internet Security notifies you when high-certainty threats are detected and removed. SONAR