![]() This guide provides important designing and planning information for deploying application control policies by using AppLocker. This topic for the IT professional introduces the design and planning steps required to deploy application control policies by using AppLocker. Learn more about the Windows Defender Application Control feature availability. ![]() Result = CoCreateInstance(&CLSID_AppIdPolicyHandlerClass, NULL, CLSCTX_INPROC_SERVER, &IID_IAppIdPolicyHandler, &pIAppIdPolicyHandler) įinally, either GetPolicy or GetEffectivePolicy can be invoked to get the AppLocker policies.Some capabilities of Windows Defender Application Control are only available on specific Windows versions. IAppIdPolicyHandler* pIAppIdPolicyHandler = NULL Example with error handling omitted: HRESULT result = CoInitialize(NULL) The CoInitialize and CoCreateInstance Windows APIs can be used to respectively initialise the COM library in the current running thread and then initialise the interface. The first interface will be defined as follows: typedef struct AppIdPolicyHandlerVtbl vtable), which is nothing more than a pointer to the first structure with all the methods. ![]() The second structure will define the virtual method table (i.e. The first structure will define all the methods of the interface, methods from the the inherited interfaces included. In this case I used the dnSpy to reverse engineer the Assembly.Īt this point we have all we need to define the interface in C.įirst thing to know is that we will implement a C++-style class in C, which means that we will need to implement two structures. NET application are compiled into Microsoft Intermediate Language (MSIL) instead of machine code. NET applications are known to be easy to reverse engineer, at least when they are not obfuscated. In my case this will return the path of the Assembly, in the form of a DLL, from the Global Assembly Cache (GAC): C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\.Cmdlets\v4.0_10.0.0.0_31bf3856ad364e35\.Cmdlets.dll. To get the Assembly we can execute the following PowerShell Cmdlet: Get-Command Get-AppLockerPolicy | Select-Object Dll Under the hood this Cmdlet is loading and using Types from a. You can find the source code of the application in my Windows System Programming Experiments (WSPE) repository on GitHub: List AppLocker PoliciesĪccording to the Microsoft documentation, the Get-AppLockerPolicy is the PowerShell Cmdlets that can be used to list all the policies. Ultimately, the reason why I'm writing this blog post is because I think it is interesting to provide an example of how it is possible to use a COM interface when the definition of the interface is not provided by Microsoft. I submitted a pull request to their project in order to use the COM interface instead of the aforementioned Assembly Types. In terms of operational security, there is no need to load and use theses Assemblies when they are only wrappers around a COM interface, as we will see later. Despite being an interesting implementation in C#, they are using the following two Assembly Types:Īs a result, the following four Assemblies are loaded into the default application domain: Most of the examples, if not all the examples online are using the Get-AppLockerPolicy PowerShell Cmdlet but more recently and released a tooled named SharpAppLocker to list AppLocker policies. Finally, AppLocker can be configured via Group Policies (GPO), which is incredibly helpful for maintaining and updating rules across an estate. allow or deny) can be set based on the program's path, publisher or hash. C:\Users\Public\myapp.appx)īesides, having different rule types, the restriction (i.e. Packaged app rules, for new Microsoft Store installation packages (e.g.Script rules, for Windows Script Host (WSH) scripts (e.g.Windows Installer rules, for installation files (e.g.Executable rules, for executable files (e.g.AppLocker has also multiple rule types, which are as follows: AppLocker has been introduced in Windows 10, originally only for Enterprise and Education versions.ĪppLocker offers a lot of flexibility because the allow/deny rules are set to a SID and therefore can be applied to any security principal (i.e. ![]() This is where AppLocker is coming into play, this is the successor of SRP. With Windows XP and Windows Server 2013, Microsoft released Software Restriction Policy (SRP), which was a great idea but a massive pain to configure with little to no flexibility. Application whitelisting and blacklisting is an interesting topic because depending on how it has been configured this can drastically increase the difficulty of an attacker to gain initial code execution. ![]()
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