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Why do adversaries use MSIX packages?
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<blockquote data-quote="Andy Ful" data-source="post: 1090393" data-attributes="member: 32260"><p>From the article:</p><h4>Prevent the installation of apps that do not originate from the Microsoft Store</h4><p>The installation and execution of apps that do not originate from the Microsoft Store is referred to as “sideloading.” An administrator can disable sideloading in either <a href="https://admx.help/?Category=Windows_10_2016&Policy=Microsoft.Policies.Appx::AppxDeploymentAllowAllTrustedApps" target="_blank">Group Policy</a> or <a href="https://learn.microsoft.com/en-us/windows/client-management/mdm/policy-csp-applicationmanagement#allowalltrustedapps" target="_blank">Microsoft Intune</a> by disabling the AllowAllTrustedApps policy.</p><p></p><p><img src="https://redcanary.com/wp-content/uploads/2024/02/image8-2.png" alt="Screenshot depicting Steam installation failure due to sideloading" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>In the article, the authors provide the correct way of preventing the installation of apps that do not originate from the Microsoft Store. This requires a registry tweak (AllowAllTrustedApps policy must be set to 0). </p><p></p><p>[ATTACH=full]283882[/ATTACH]</p><p></p><p></p><p>The information provided by the ADMX incorrectly claims that the non-configured policy works just like a disabled policy, but it is not true (tested on the latest version of Windows 11).</p></blockquote><p></p>
[QUOTE="Andy Ful, post: 1090393, member: 32260"] From the article: [HEADING=3]Prevent the installation of apps that do not originate from the Microsoft Store[/HEADING] The installation and execution of apps that do not originate from the Microsoft Store is referred to as “sideloading.” An administrator can disable sideloading in either [URL='https://admx.help/?Category=Windows_10_2016&Policy=Microsoft.Policies.Appx::AppxDeploymentAllowAllTrustedApps']Group Policy[/URL] or [URL='https://learn.microsoft.com/en-us/windows/client-management/mdm/policy-csp-applicationmanagement#allowalltrustedapps']Microsoft Intune[/URL] by disabling the AllowAllTrustedApps policy. [IMG alt="Screenshot depicting Steam installation failure due to sideloading"]https://redcanary.com/wp-content/uploads/2024/02/image8-2.png[/IMG] In the article, the authors provide the correct way of preventing the installation of apps that do not originate from the Microsoft Store. This requires a registry tweak (AllowAllTrustedApps policy must be set to 0). [ATTACH type="full"]283882[/ATTACH] The information provided by the ADMX incorrectly claims that the non-configured policy works just like a disabled policy, but it is not true (tested on the latest version of Windows 11). [/QUOTE]
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