Windows File and Directory Permissions Modification
Created the Tuesday 31 January 2023. Updated 6 months, 2 weeks ago.
Adversaries may modify file or directory permissions/attributes to evade access control lists (ACLs) and access protected files. File and directory permissions are commonly managed by ACLs configured by the file or directory owner, or users with the appropriate permissions. File and directory ACL implementations vary by platform, but generally explicitly designate which users or groups can perform which actions (read, write, execute, etc.).
Windows implements file and directory ACLs as Discretionary Access Control Lists (DACLs). Similar to a standard ACL, DACLs identifies the accounts that are allowed or denied access to a securable object. When an attempt is made to access a securable object, the system checks the access control entries in the DACL in order. If a matching entry is found, access to the object is granted. Otherwise, access is denied.
Adversaries can interact with the DACLs using built-in Windows commands, such as icacls, cacls, takeown, and attrib, which can grant adversaries higher permissions on specific files and folders. Further, PowerShell provides cmdlets that can be used to retrieve or modify file and directory DACLs. Specific file and directory modifications may be a required step for many techniques, such as establishing Persistence via Accessibility Features, Boot or Logon Initialization Scripts, or tainting/hijacking other instrumental binary/configuration files via Hijack Execution Flow.
Technique Identifier
Additional Resources
External Links
The resources provided below are associated links that will give you even more detailed information and research on current evasion technique. It is important to note that, while these resources may be helpful, it is important to exercise caution when following external links. As always, be careful when clicking on links from unknown sources, as they may lead to malicious content.
Attachments
By downloading or using the attached resources, you are agreeing to be bound by the terms and conditions outlined by the provider of the resources. It is important to review and understand these terms before proceeding with the download or use of the files. If you do not agree to the terms, or are unable to agree to them, please do not download or use the attached resources.
Additionally, it's important to be aware of the potential risks that come with downloading resources from unknown sources, as they may contain malware or other malicious content. It's highly recommended to scan the resources with an up-to-date antivirus software before opening or using them.
Please note that even if you take the necessary precautions to check the resources, it is not possible to guarantee that they are completely safe and risk-free. Use of the attached resources is at your own risk.
Subscribe to our Newsletter
Don't miss out on the latest and greatest updates from us! Subscribe to our newsletter and be the first to know about exciting content and future updates.