{"id":5099,"date":"2026-04-01T08:00:00","date_gmt":"2026-04-01T05:00:00","guid":{"rendered":"https:\/\/support.withsecure.com\/?post_type=changelog&#038;p=5099"},"modified":"2026-10-19T11:57:02","modified_gmt":"2026-10-19T08:57:02","slug":"countercept-agent-for-windows-2026-04-01-ultralight-core-update","status":"publish","type":"changelog","link":"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-04-01-ultralight-core-update\/","title":{"rendered":"Countercept Agent for Windows &#8211; 2026-04-01 &#8211; Ultralight Core update"},"content":{"rendered":"<p>This is a notification that the update to our Windows agent&#8217;s Ultralight Core planned for GA release tomorrow, 2nd of April 2026, has been postponed until Thursday, 16th of April. The update went to Pilot group endpoints on the 26th of March 2026. Events received from the Pilot group identified the need to adjust sensor side rules before going to General Availability.<\/p>\n<p>The update is related to the Countercept Agent\u2019s Ultralight Core. Ultralight Core provides low-level functionality such as file hash calculation as part of the agent\u2019s reporting of endpoint activity.<\/p>\n<p>Product Name: Countercept Agent for Windows &#8211; Ultralight Core<\/p>\n<p>Version: 2.1.21739<\/p>\n<p>Pilot Availability: 26\/03\/2026<\/p>\n<p>General Availability: 16\/04\/2026<\/p>\n<p>Predecessor: 2.1.21258<\/p>\n<p>Release Purpose:<\/p>\n<ul>\n<li>General maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See\u00a0<span class=\"js-embed embedResponsive inlineEmbed\"><br \/>\n    <a href=\"https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level\" rel=\"nofollow noopener ugc\" target=\"_blank\"><br \/>\n        https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level<br \/>\n    <\/a><br \/>\n<\/span><br \/>\n\u00a0\u00a0for more details.<br \/>\nAny endpoints which are not ACS-compliant will continue to run the older version of the Ultralight Core (2.1.16183).<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>CapricornScanner.exe<\/li>\n<li>fshoster64.exe<\/li>\n<li>FsPisces.exe<\/li>\n<li>install.exe<\/li>\n<li>jsondump64.exe<\/li>\n<li>uninstall.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>General maintenance of functionality not utilized by Countercept.<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>This is a notification that the update to our Windows agent&#8217;s Ultralight Core planned for GA release tomorrow, 2nd of April 2026, has been postponed until Thursday, 16th of April.&hellip;<\/p>\n","protected":false},"template":"","changelog_product":[134],"class_list":["post-5099","changelog","type-changelog","status-publish","hentry"],"acf":{"release_date":"20260401","version":"","source_system":"vanilla-import","source_foreign_id":"","import_hash":"814f77ea0672df99a3e4a510873b508b44d1ea12","vanilla_article_id":32873,"legacy_author":"sebsan","vanilla_url":"https:\/\/community.withsecure.com\/changelogs-en\/kb\/articles\/32873-countercept-agent-for-windows-2026-04-01-ultralight-core-update","vanilla_category_id":191,"machine_translated":false},"_links":{"self":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/changelog\/5099","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/changelog"}],"about":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/types\/changelog"}],"wp:attachment":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/media?parent=5099"}],"wp:term":[{"taxonomy":"changelog_product","embeddable":true,"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/changelog_product?post=5099"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}