![]() ![]() The AaronLocker.zip package was extracted to the C:\ directory and AccessChk.exe was placed in the same AaronLocker directory. AccessChk has been added to the Windows 10 machine to allow AaronLocker to determine if directories are user writeable. We have downloaded Sysinternals AccessChk.exe from the following link. This tutorial was conducted on a Windows 10 machine running PowerShell v5.1 with script execution enabled. ![]() Other user maintained directories are restricted unless otherwise authorized. Programs in directories such as the program files directory which is accessible only to the administrator are considered to be valid and allowed to run. This is controlled both by user permissions and location. Programs or scripts added to the computer by a non-administrative user are not allowed to execute unless specifically allowed by an administrator. Nifty!ĪaronLocker files can be downloaded from github at the following link: ĪaronLocker implements Microsoft AppLocker according to a specific strategy. AaronLocker even includes some additional scripts to both capture policy and event data from Microsoft AppLocker in an excel file. The overall objective is to make Windows AppLocker implementation more robust, practical, and maintainable while still remaining free. It is written entirely in PowerShell (5.0 and later) and includes a small number of scripts that are easily customizable for more specific requirements. What is AaronLocker?ĪaronLocker, named for its namesake developer, Aaron Margosis, is a wrapper for the traditional implementation of Windows AppLocker. However, a new player has joined the fold, AaronLocker. This whitelisting program allows Windows users to protect itself from disk based malware by way of restricting executable programs to a specific list of paths, hashes, or signed applications. As AppLocker by default trusts Microsoft signed binaries and Windows folders it is essential to evaluate permissions and trusted binaries that can execute code in order to protect effectively the Windows ecosystem.If you are a Windows user, you have likely heard of Microsoft AppLocker. Implementing AppLocker by default doesn’t really provide any security measure since it can be bypassed easily. AppLocker – Default Rules AppLocker Bypass – Weak Path Rules Conclusion Otherwise it will be blocked by the AppLocker rules. ![]() Since the AppLocker rules are allowing files that are contained inside the Windows folder to be executed then the utility would run as normal. ![]() AppLocker – Binary Planting into Weak Folder In this case the executable is the legitimate application accesschk64. The next step is to drop the binary into the folder that has weak permissions and execute it. The accesschk tool can be used to identify if the group “Users” have RW permissions inside the Windows folder. Windows environments (check was done in Windows Server 2008 R2) by default allowing standard users of the system to have read and write access in these folders: AppLocker rules by default are allowing all the files that are inside in the Windows folder and Program files to be executed as otherwise the system will not operate as normal. If appropriate permissions are not set in these folders an attacker could exploit this in order to bypass AppLocker. ![]()
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