AppLocker is an application control feature found in enterprise editions of Windows. The tool enables you to manage which applications and files users can run. Windows AppLocker aims to limit software access and related data from specific users and business groups. AppLocker is a freeware locker software download filed under pc locking software and made available by Smart-X for Windows. The review for AppLocker has not been completed yet, but it was tested by an editor here on a PC and a list of features has been compiled; see below.

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What is AppLocker?

AppLocker is an application whitelisting feature which helps an organization to control what apps and files can be run by the user. AppLocker was first introduced with Windows 7 OS, Windows Server 2008 R2.

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AppLocker provides a simple interface to prevent or block an application from running by unintended users. These include Windows Installer Files, executable files, dynamic-link libraries (DLLs), packaged app installers, scripts, packaged apps and so on.

AppLocker overview

AppLocker is inbuilt into Windows OS enterprise-level edition and needs no additional installation onto the system. For standalone systems, rules can be enforced using the Local Security Policy editor (secpol.msc). For a group of computers, it can be done using the Group Policy Management Console.

AppLocker rules

AppLocker is capable of blocking different file types. The following are the types of files AppLocker is capable of blocking.

1. Executable files like .exe, .com
2. Windows installer files like .mst, .msi and .msp
3. Executable files like .bat, .ps1, .cmd, .js and .vbs
4. DLL executables
5. Packaged app installers like .appx

Creating AppLocker rules

The following are the steps to create a rule in AppLocker.

Type local security policy and click “Run as Administrator”.

Under Application Control Policies, right-click on Executable Rules under AppLocker as shown.

Click on Default Rules. Default Rules get created, as shown below.

Create New Rule by right-clicking Executable Rules, as shown.

Click Next. Select Deny for denying certain files from getting executed. By default, rules applies to everyone, you can select User or Group as per the need:

Select File Hash, as shown.

Select Browse Folders and navigate to the path for the executable/file you want to deny execution. We will deny Notepad++ from being executed, as shown.

Click OK. Notepad++ Files not allowed to execute get populated, as shown.

Click Next, give the name for the rule and click Create, as shown.

The rule to block Notepad++ gets created and users are not allowed to execute Notepad++ on the system. Now close Local Security Policy Editor.

That’s how simple it is to use AppLocker to block any file from getting executed.

Sources

1. What Is AppLocker?, Microsoft
2. Use AppLocker to create a Windows 10 kiosk that runs multiple apps, Microsoft
3. AppLocker, Microsoft
4. How to Use AppLocker to Allow or Block Executable Files from Running in Windows 10, Windows TenForums
5. AppLocker in Windows 10 Enterprise, Michael Firsov (WordPress)

AppLocker is an application whitelisting technology introduced with Microsoft'sWindows 7 operating system. It allows restricting which programs users can execute based on the program's path, publisher, or hash,^[1] and in an enterprise can be configured via Group Policy.

Summary

Windows AppLocker allows administrators to control which executable files are denied or allowed to execute. With AppLocker, administrators are able to create rules based on file names, publishers or file location that will allow certain files to execute. Unlike the earlier Software Restriction Policies, which was originally available for Windows XP and Windows Server 2003,^[2] AppLocker rules can apply to individuals or groups. Policies are used to group users into different enforcement levels. For example, some users can be added to an 'audit' policy that will allow administrators to see the rule violations before moving that user to a higher enforcement level.

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AppLocker availability charts

Bypass techniques

There are several generic techniques for bypassing AppLocker:

• Writing an unapproved program to a whitelisted location.
• Using a whitelisted program as a delegate to launch an unapproved program.^{[7][8][9][10]}
• Hijacking the DLLs loaded by a trusted application in an untrusted directory.^[11]

References

1. ^'AppLocker'. Microsoft TechNet. Microsoft. Retrieved 23 August 2012.
2. ^'Using Software Restriction Policies to Protect Against Unauthorized Software'. Microsoft TechNet. Microsoft. Retrieved 27 July 2017.
3. ^'Windows Versions That Support AppLocker'. Microsoft. Retrieved 27 July 2017.
4. ^Visser, Erwin (18 April 2012). 'Introducing Windows 8 Enterprise and Enhanced Software Assurance for Today's Modern Workforce'. Windows for your Business. Microsoft. Retrieved 22 November 2012.
5. ^Dudau, Vlad (10 June 2015). 'Microsoft shows OEMs how to market Windows 10; talks features and SKUs'. Neowin. Neowin LLC. Retrieved 19 June 2015.
6. ^'Find out which Windows is right for you'. Microsoft. Microsoft Inc. Retrieved 2 July 2015.
7. ^'AppLocker Bypass – InstallUtil'. Penetration Testing Lab. Retrieved 27 July 2017.
8. ^'AppLocker Bypass Techniques'. Evi1cg's blog. Retrieved 27 July 2017.
9. ^'How to Bypass Windows AppLocker'. Hacking Tutorial. Retrieved 27 July 2017.
10. ^'caseysmithrc/gethelp.cs'. Github Gist. Retrieved 14 May 2019.
11. ^'Bypassing Application Whitelisting'. CERT/CC Blog. Retrieved 27 July 2017.

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