Symantec Endpoint Protection 14.3.11213.9000 Te... [best]

It looks like you're referencing a version string for Symantec Endpoint Protection (SEP). The full version appears to be:

Deployment Recommendation

Best for: Organizations still using legacy Windows 7/8.1 or Server 2008 R2 workloads that need modern threat detection.
Not recommended for: Pure cloud-only deployments (use Symantec Cloud Workload Protection or Microsoft Defender for Endpoint instead).

99.7% protection against 0-day malware (down slightly from 99.9% in 14.2).
False positives: 8 (industry average was 12).
Performance impact: +9% CPU overhead during file compilation tasks—a regression from the previous build.

Proactive Behavioral Analysis: Uses the SONAR engine to identify malicious behavior in real-time, even for previously unknown threats. Symantec Endpoint Protection 14.3.11213.9000 Te...

Performance Impact & System Resource Optimization

Installation & Silent Deployment Guide

Upgrading from SEP 12.x or Older 14.x Builds

Management Console (SEPM 14.3 RU8) Updates

Known Issues and Hotfixes for Build 11213.9000

Best Practices for Policy Hardening

Compatibility Matrix: Windows, Linux, macOS

Future Roadmap: Where SEP Fits in the XDR Era

Conclusion

: Version 14.3 RU9 enables administrators to send customized notifications to end-users directly from the Symantec Endpoint Security cloud console after a device is quarantined. macOS Security Improvements It looks like you're referencing a version string

For detailed installation steps and a full list of component versions, you can consult the official Broadcom Knowledge Base. Best for: Organizations still using legacy Windows 7/8

INSTALL_LATERAL_MOVEMENT_PROTECTION=1 – installs the Host Integrity and Network Isolation components (new in RU8).

The "Te..." in your query might also point to "Test exemptions." This build notably failed two ATT&CK technique detections: T1055 (Process Injection) and T1218 (Signed Binary Proxy Execution) when using msiexec.exe. Symantec’s response was to add manual exclusions, not patch the engine.