Countercept Agent for Windows – 2025-04-23 Update

This is a notification that an update to our Windows agent’s sensor component will be issued shortly. This release replaces the previous Windows agent’s sensor update released to Pilot group endpoints on Wednesday, the 16th of April 2025, and never proceeded to General Availability due to an issue identified during the Pilot phase.

The Sensor component gathers data to be analyzed in the WithSecure backend to identify any malicious activity. 

Product Name: Countercept Agent for Windows – Sensor Component

Version: 2025.1.89

Pilot Availability: 24/04/2025

General Availability: 05/05/2025

Predecessor: 2024.2.31

Release Purpose:

• New Features and Enhancements
• Generic maintenance

Customer Action Required:

• The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See 
  
  https://community.withsecure.com/en/kb/articles/29714-changes-in-support-on-microsoft-windows-minimum-patch-level
  
  
      for more details.
  Any endpoints which are not ACS-compliant will continue to run the previous production version of the sensor (2023.1.75).

Name Changes :

• No changes to file, process, or service names.

Files Updated :

• fsatp.sys
• fsatpl.exe
• fsatpn.exe
• install.exe
• sensor_control.exe

New Features and Enhancements:

• Detection improvements
• Interoperability improvements

General Maintenance:

• Fix for large amount of unnecessary events being sent by the 2025.1.85 sensor. This fix was omitted from
  2025.1.86 release due to sensor malfunction being prioritized.
• Crash fixes

OS Support:

• Windows 10, 11
• Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025

Please note that Windows 7 and Windows Server 2008 (R2) are not supported. On endpoints where these operating systems are in use, the Countercept agent will not be updated, and the previous sensor version (2024.2.31) will continue to run. New Countercept agent installations to these operating systems are now impossible.