Essentially, we are looking for any folder that has write permissions for Users or Authenticated Users. We can then save the output and use a program like LibreOffice Calc or Excel to filter down to the permissions that we care about. In my opinion, any security professional working with Windows should be familiar with the Sysinternals Toolkit because it contains a number of useful utilities to see what is going on on a system.ĪccessEnum will enumerate all of the permissions on a given directory and its subdirectories. AccessEnum is part of the Sysinternals Suite. How do we find these? We could use PowerShell (Get-Acl, look for directories with Write access), but I wanted to show another tool: AccessEnum. Unfortunately, there are places in the Windows directory that any user can write to. The specific rules you will want to use will depend on your environment, but one that is particularly problematic is that second one. Those are not a bad start, but we can (and should) do better. Everyone can execute anything in the Windows folder.Everyone can execute anything in Program Files. You can see that there were three rules created by default: Click "Create a GPO in this domain, and Link it here": In this case, we will use the Workstations OU we defined previously. Right click the organizational unit (OU) that you want to apply AppLocker policies to. To get started, open Group Policy Management (Start > Run > gpmc.msc or hit the Windows key and start typing Group Policy). If you have an appropriate version of Windows with AppLocker, you can implement it through Local Group Policy. The examples we will work through today are in our test domain that we built a little while back. You might want to use AppLocker to only allow applications signed by trusted publishers (like your internal developers or organizations you have a relationship with). AppLocker is good when you want relatively granular control over which applications are allowed to run in your network. As we talked about with EMET, it is meant to be one layer in a multi-layer defense. This feature is similar to (but not exactly the same as) other Mandatory Access Control (MAC) measures in Linux such as SELinux and AppArmor.ĪppLocker is not intended to be the only defense mechanism you employ in your organization. It is typically deployed through Group Policy either on a single computer or across a domain. Packaged app rules in AppLocker are available in versions of Windows with apps (Windows 8 / Server 2012 and higher). You can also control scripts (PowerShell and Visual Basic scripts), packaged apps and their installers, DLLs, and Windows Installer files (.msi). exe files are not the only executables you can control with AppLocker. As a rule of thumb, on the client side, you need at least the Pro version of Windows (Pro, Enterprise, Ultimate). Different versions of Windows allow you to do different things with AppLocker. On the server side, it was introduced in Windows Server 2008 R2. On the client side, AppLocker was introduced with Windows 7. These rules are defined on aspects of the application (usually based on its digital signature) and who is trying to use it. It does this based on a set of rules defined by the administrator of the domain or computer. More after the jump.ĪppLocker is a mechanism in Windows for controlling access to applications. Finally, we will talk about how to use it. Then, we will talk about why you would want to use it. We will start with a discussion of what it is. Hey everyone - Today, we are going to talk about AppLocker.
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