I've not posted on here since May, as I've been busy with (well, life in general) projects and whatnot. This short blog post may be useful for a Red Team by living-of-the-land for the execution of payloads on a machine where Windows Sandbox can be enabled; Windows Sandbox is designed to work this way - no exploitation of anything is covered in this post. With this technique in terms of executing within a VM, we don't need to load an external ISO onto the machine, as all of this is handled by the sandbox. From my visibility, .wsb was not inspected or blacklisted on any major EDR or AV.
At the tail end of last year, Microsoft introduced a new feature named Windows Sandbox (WSB for short). Windows Sandbox allows you to quickly, within 15s, create a disposable Hyper-V based Virtual Machine with all of the qualities a familiar VM would have such as clipboard sharing, mapping directories etc. The sandbox is also the underlay for Microsoft Defender Application Guard (WDAG), for dynamic analysis on Hyper-V enabled hosts and can be enabled on any Windows 10 Pro or Enterprise machine - making this a perfect as a living off the land technique.
How To Enable Windows 10 Sandbox
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The user can either launch a default instance of the sandbox or create a .wsb file with specific parameters. These parameters are defined by Microsoft here. The WSB extension is associated with Windows Sandbox and will launch a new instance with your defined values. For example, the below configuration will run cmd and ping upon boot.
The command could be anything - I just used the one above as a placeholder. The .wsb extension is also registered to be handled by WindowsSandbox.exe - giving room to a social engineering attack encouraging a victim to execute it where it is enabled.
I am trying to use Windows Sandbox on a windows 10 pro machine. The application connects without issue with the firewall disabled , but stops internet connection with it enabled. I have created an rule to allow Windows Sandbox application but it does not work. Any ideas to configure rules to get this work?
The container will have Internet access and is meant to be, as the name implies, disposable. It is also meant to be isolated and protected. However, you can customize the Windows Sandbox to make it better fit your needs. Be aware, that most likely any configurations you impose might reduce security. Or at least the sandbox's original intent. You'll have to balance between security and usability.
The Windows Sandbox doesn't have much in the way of a management interface. Maybe that will change in future versions. If you want to customize your sandbox experience, you need to create an XML file that uses a .wsb extension. There is documentation at -us/windows/security/threat-protection/windows-sandbox/windows-sandbox-configure-using-wsb-file but I'll share with you what I'm doing.
Remember, nothing is persistent in the sandbox but you can use a configuration file to at least set the initial state. That's what I am doing. The first part of the file is mapping folders from my desktop to the sandbox. I want to have full access to my Scripts folder. To keep things simple I'm using the same folder path. I'm also mapping a folder to my local Pluralsight folder. This has files I need for my setup, which I'll get to in a moment. As a precaution from doing anything stupid, I am making this a read-only folder.
I want to be able to easily copy and paste so I enable the clipboard. I'm also setting how much memory I want the sandbox to use. My desktop as 32GB of RAM so I can easily set aside 8GB. Now for the fun part.
You can define a command to run when the sandbox starts up. After a bit of testing and experimentation, I concluded the easiest solution was to create a batch cmd file. This file can then call all the other code I need for my configuration.
As I mentioned, the sandbox is locked down by default so I'm easing up on the restrictions to meet my needs. Such as setting the execution policy. The main configuration is done in the Sandox-config.ps1 file.
That is very nice to know ?
Ever since I learned DSC and especially followed your DSC course, using DSC to configure becomes my first all-time first choice.
Thanks for your information here, I will try if I can make it work in the sandbox.
It will also be highly appreciated if you can write a post about your journey there.
It is never unpleasant to read your posts ?
I want a launcher to be able to access programs in the sandbox. The launcher thinks the programs crashed when they're isolated, so I lose functionality. I tried the Resource Access settings but I don't think I did it properly since it didn't work. For example, I tried Window Access and put in the class from WinSpy of the unsandboxed launcher, but it didn't work.
"This setting tells Sandboxie to not translate window class names as described above, and also makes all windows in the system accessible to sandboxed programs, and goes a step further to disable a few other windowing-related Sandboxie functions. This may also cause the Sandboxie indicator [#] to not appear in window titles.
Since I specified my launcher, the sandboxed programs shouldn't be able to access ALL other windows right?... Are there any other alternatives that only allow one-way communication from the launcher to the sandboxed program? *'s description seems to suggest that it allows two-way communication. If the sandboxed program is infected, does that allow it to infect the launcher and open the door to the rest of my computer?
One more way to enable the Sandbox is through a PowerShell command. In Windows 10, click the Start menu, scroll down the Apps list, open the folder for Windows PowerShell, right-click the shortcut for Windows PowerShell, and then select Run as Administrator.
The sandbox is great for demos, troubleshooting or if you are dealing with malware. If you close the sandbox, all the software with all its files and state are permanently deleted. It is a Windows 10 virtual machines, with the advantage that it is built into Windows 10, so it leverages the existing OS, which gives you faster startup, less footprint, better efficiency, and easier handling, without losing security.
To install Windows Sandbox feature on Windows 10 (1903) or higher, you need to make sure that the virtualization capabilities are enabled in the BIOS/UEFI. Most of the desktop and notebook CPUs today, will support this. If you are running Windows 10 inside a virtual machine, you will need to enable nested virtualization. You can find more information about enabling Nested Virtualization on my blog: Nested Virtualization in Windows Server 2016 and Windows 10
By default, Windows Sandbox spins up a default image. However, in many cases, you want to spin up a customized environment, with already preinstalled tools or access to local files. For that, you can use config files which allow you to customize the sandbox during startup. The sandbox configuration files are formatted as XML and use the .wsb file extension. Today, you can configure four different settings to configure the Windows Sandbox.
I updated some of my machines this week-end, the sandbox was running fine until the 2019-05 .NET framework update got installed. As soon as the update is installed I have the error.
Removing the update and rebooting the machines did the trick.
Hi Marc Vanderhaegen, for your issue it should be because you have done some windows update on your host.
Check in update if the KB4495620 is installed. If yes, uninstall it, then powershell on Sandbox should work again.
I need to be able to connect to a printer on the network 192.168.0.1/24. When I am using Sandbox it gives me and IP address in the 172.0.0.0 network. I need to know if its possible to change the IP address on the sandbox to the 192.168.0.1/24 network and be able to communicate.
A great number of programs are available to download from the internet for free. But freeware especially is associated with the risk of installing malware in addition to the actual application and thereby damaging the operating system. Users typically only realize that a program is harmful after having installed it. The sandbox solves this problem and allows users to install software preliminarily within an isolated environment. As of Windows 10 Pro version 1903, Windows Sandbox has been available as part of the operating system, but it is usually disabled in the settings. We explain how you can turn on Windows Sandbox step by step.
Windows Sandbox will then open as its own window. The user interface is identical to the normal Windows operating system. To start a program in the sandbox, copy the files from the regular operating system into the cache using the key combination [Ctrl] + [C]. Next, insert the file into the sandbox using [Ctrl] + [V]. There, you can run or install the application.
Windows Sandbox is a utility that Microsoft introduced back in May 2019 on Windows 10. It is a handy feature that enables you to download or run untrusted files in a sandbox environment before you try them out on your primary installation. The benefit is that you don't need to download and install Windows ISOs or virtual machines, Microsoft handles all that for you itself. Other advantages that Microsoft notes are its efficiency, security, and disposability.
The capability is present on both Windows 10 and Windows 11, and today, we'll walk you through how to enable it on either of the operating systems. The installation method is identical in both the OSes, but for this guide, we'll be using Windows 10 Pro version 21H2. With that said, let's begin! 589ccfa754
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