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How do you secure PowerShell?
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<blockquote data-quote="Andy Ful" data-source="post: 625958" data-attributes="member: 32260"><p>I did some tests with fake PowerShell executable known as 'p0wnedShell'. I compiled it including original System.Management.Automation.dll .</p><p>Tests were done with active default deny SRP to force ConstrainedLanguage mode. So, I copied original powershel.exe and custom made p0wnedShell.exe into whitelisted folder and run as standard user.</p><ol> <li data-xf-list-type="ol">The executable p0wnedShell.exe worked in FullLanguage mode, while powershell.exe worked in ConstrainedLanguage mode.</li> <li data-xf-list-type="ol">Both executables respected Registry settings: ExecutionPolicy and EnableScripts.</li> </ol><p>So, the custom made executable, can bypass Language mode, but probably cannot bypass so easy, EnableScripts registry tweak.</p><p>The Language mode solutions require original powershell.exe to work properly.</p></blockquote><p></p>
[QUOTE="Andy Ful, post: 625958, member: 32260"] I did some tests with fake PowerShell executable known as 'p0wnedShell'. I compiled it including original System.Management.Automation.dll . Tests were done with active default deny SRP to force ConstrainedLanguage mode. So, I copied original powershel.exe and custom made p0wnedShell.exe into whitelisted folder and run as standard user. [LIST=1] [*]The executable p0wnedShell.exe worked in FullLanguage mode, while powershell.exe worked in ConstrainedLanguage mode. [*]Both executables respected Registry settings: ExecutionPolicy and EnableScripts. [/LIST] So, the custom made executable, can bypass Language mode, but probably cannot bypass so easy, EnableScripts registry tweak. The Language mode solutions require original powershell.exe to work properly. [/QUOTE]
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