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Countercept Agent for Windows - 2026-09-09 - Ultralight Core update

The update is related to the Countercept Agent’s Ultralight Core. 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: 2.1.22416

Pilot Availability: 10/09/2026

General Availability: 17/09/2026

Predecessor: 2.1.22029

Release Purpose:

General 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 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
fshoster64.exe
FsPisces.exe
uninstall.exe

New Features and Enhancements:

General Maintenance:

Vulnerability fixes and bug fixes

OS Support:

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