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Countercept Agent for Windows – 2025-05-16 Update #2
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The update is related to the Countercept Agent’s Ultralight Core component. Ultralight Core provides low-level functionality such as file hash calculation as part of the agent’s reporting of endpoint activity.
Product Name: Countercept Agent for Windows – Ultralight Core
Version: 2.1.20390
Pilot Availability: 19/05/2025
General Availability: 26/05/2025
Predecessor: 2.1.20210
Release Purpose:
- General maintenance
Customer Action Required:
- The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See
for more details.
Any endpoints which are not ACS-compliant will continue to run the older version of the Ultralight Core (2.1.16183).
Name Changes:
New service will be registered with this release:
- wsulavprothoster_mdr
New process will be added with this release:
- fsulprothoster.exe
More details can be found at Changes to the Windows EPP Scanning Components – May 2025
Files Updated:
- CapricornScanner.exe
- fsulgk.sys
- install.exe
- uninstall.exe
New Features and Enhancements:
- N/A
General Maintenance:
- Fixes for issues identified during 2.1.20350 pre-Pilot.
- General maintenance of functionality not utilized by Countercept
OS Support:
- Windows 10, 11
- Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025
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Countercept Agent for Windows – 2025-05-05 Update
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The update is related to the Countercept Agent’s Ultralight Core component. Ultralight Core provides low-level functionality such as file hash calculation as part of the agent’s reporting of endpoint activity.
Product Name: Countercept Agent for Windows – Ultralight Core
Version: 2.1.20350
Pilot Availability: 07/05/2025
General Availability: 14/05/2025
Predecessor: 2.1.20210
Release Purpose:
- General maintenance
Customer Action Required:
- The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See
for more details.
Any endpoints which are not ACS-compliant will continue to run the older version of the Ultralight Core (2.1.16183).
Name Changes:
New service will be registered with this release:
- wsulavprothoster_mdr
New process will be added with this release:
- fsulprothoster.exe
More details can be found at Changes to the Windows EPP Scanning Components – May 2025
Files Updated:
- CapricornScanner.exe
- fsulgk.sys
- install.exe
- uninstall.exe
New Features and Enhancements:
- N/A
General Maintenance:
- General maintenance of functionality not utilized by Countercept
OS Support:
- Windows 10, 11
- Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025
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Countercept Agent for Windows – 2025-05-02 Update
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This is a notification that the update to our Windows agent’s Ultralight Core planned for the Pilot release on Tuesday the 29th April 2025, has been cancelled.
Due to possible effect to Countercept Agent caused by general maintenance of the functionality not utilized in the product, identified during the pre-Pilot phase, the Pilot release for the Ultralight Core has been cancelled and a new release will be prepared. We will advise on the release schedule for the new update.
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Countercept Agent for Windows – 2025-04-28 Update
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The update is related to the Countercept Agent’s Ultralight Core component. Ultralight Core provides low-level functionality such as file hash calculation as part of the agent’s reporting of endpoint activity.
Product Name: Countercept Agent for Windows – Ultralight Core
Version: 2.1.20350
Pilot Availability: 29/04/2025
General Availability: 05/05/2025
Predecessor: 2.1.20210
Release Purpose:
- General maintenance
Customer Action Required:
- The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See
for more details.
Any endpoints which are not ACS-compliant will continue to run the older version of the Ultralight Core (2.1.16183).
Name Changes:
- No changes to file, process, or service names.
Files Updated:
- CapricornScanner.exe
- fsulgk.sys
- install.exe
- uninstall.exe
New Features and Enhancements:
- N/A
General Maintenance:
- General maintenance of functionality not utilized by Countercept
OS Support:
- Windows 10, 11
- Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025
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Countercept Agent for Windows – 2025-04-23 Update
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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
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.