{"id":54978,"date":"2024-01-04T00:02:44","date_gmt":"2024-01-04T00:02:44","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/microsoft-kills-off-windows-app-installation-from-the-web-again\/"},"modified":"2024-01-04T00:02:44","modified_gmt":"2024-01-04T00:02:44","slug":"microsoft-kills-off-windows-app-installation-from-the-web-again","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/microsoft-kills-off-windows-app-installation-from-the-web-again\/","title":{"rendered":"Microsoft kills off Windows app installation from the web, again"},"content":{"rendered":"<p>Microsoft has disabled a protocol that allowed the installation of Windows apps after finding that miscreants were abusing the mechanism to install malware.<\/p>\n<p>The move came just before Christmas, and seemingly mimicked issues first reported in <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/github.com\/MicrosoftDocs\/msix-docs\/commit\/3c3ab6d2df2e373590fef21dba6d468f58a11343\">December 2021<\/a>, to address a Windows AppX Installer vulnerability (<a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2021-43890\">CVE-2021-43890<\/a>) in which an attacker could spoof App Installer into installing malicious software.<\/p>\n<p>Microsoft re-enabled the protocol, known as the ms-appinstaller URI scheme, <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/techcommunity.microsoft.com\/t5\/windows-it-pro-blog\/disabling-the-msix-ms-appinstaller-protocol-handler\/ba-p\/3119479\">on August 5, 2022<\/a>, with the release of Windows 11 Insider Preview Build 25147. It made the protocol available to some enterprise customers who chose to use it via the Local Group Policy Editor.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZZZaZ7an8w3Y-4m5Fm-eiAAAAQU&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZZZaZ7an8w3Y-4m5Fm-eiAAAAQU&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The ms-appinstaller URI scheme allows the <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/learn.microsoft.com\/en-us\/windows\/msix\/overview\">MSIX<\/a> package installer to install Windows apps <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/learn.microsoft.com\/en-us\/windows\/msix\/app-installer\/installing-windows10-apps-web\">from a web page<\/a> using the local App Installer application. Doing so allows installation without the need for local storage. This has proven to be a popular feature, according to Microsoft.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZZZaZ7an8w3Y-4m5Fm-eiAAAAQU&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZZZaZ7an8w3Y-4m5Fm-eiAAAAQU&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZZZaZ7an8w3Y-4m5Fm-eiAAAAQU&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZZZaZ7an8w3Y-4m5Fm-eiAAAAQU&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>Alas, as the Microsoft Threat Intelligence group <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.microsoft.com\/en-us\/security\/blog\/2023\/12\/28\/financially-motivated-threat-actors-misusing-app-installer\/\">noted<\/a> last week, miscreants have been abusing the ms-appinstaller URI scheme to distribute malware. It appears that the protocol provided a way around Microsoft&#8217;s security checks.<\/p>\n<p>&#8220;Threat actors have likely chosen the ms-appinstaller protocol handler vector because it can bypass mechanisms designed to help keep users safe from malware, such as Microsoft Defender SmartScreen and built-in browser warnings for downloads of executable file formats,&#8221; Redmond explained.<\/p>\n<p>Microsoft had relied on developers having to sign their app packages with &#8220;a third party paid certificate from a trusted certification authority,&#8221; but evidently it put too much trust in such authorities.<\/p>\n<p>Following its decision to disable ms-appinstaller by default last week (in App Installer version 1.21.3421.0 or higher), Redmond announced it is working with certificate authorities &#8220;to revoke the abused code signing certificates utilized by malware samples we have identified.&#8221;<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZZZaZ7an8w3Y-4m5Fm-eiAAAAQU&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZZZaZ7an8w3Y-4m5Fm-eiAAAAQU&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Customers who have EnableMSAppInstallerProtocol group policy set to &#8220;Not Configured&#8221; (blank) or &#8220;Enabled&#8221; and are also using vulnerable versions of App Installer \u2013 from v1.18.2691 up until v1.21.3421, as well as Windows OS updates between October 2022 and March 2023 \u2013 are advised to update App Installer and to set the desired policy.<\/p>\n<p>For enterprise customers, pushing out a network-wide policy change may take some effort. And for those who rely on web-based installation as an app distribution channel, the consequence is a bit more friction for downloading and installation after proper checks.<\/p>\n<p>Microsoft did not respond to a request for comment. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2024\/01\/04\/microsoft_windows_app_installation\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Unpleasant Christmas package lets malware down the chimney Microsoft has disabled a protocol that allowed the installation of Windows apps after finding that miscreants were abusing the mechanism to install malware.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-54978","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Microsoft kills off Windows app installation from the web, again 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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