> For the complete documentation index, see [llms.txt](https://dmcxblue.gitbook.io/red-team-notes-2-0/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dmcxblue.gitbook.io/red-team-notes-2-0/red-team-techniques/credential-access/t1556-modify-authentication-process/domain-controller-authentication.md).

# Domain Controller Authentication

Adversaries may patch the authentication process on a domain controller to bypass the typical authentication mechanisms and enable access to accounts.

Malware may be used to inject false credentials in the authentication process on a domain controller with the intent of creating a backdoor used to access any user's account and/or credentials (ex: Skeleton key). Skeleton key works through a patch on an enterprise domain controller authentication process (LSASS) with credentials that adversaries may use to bypass the standard authentication system. Once patched, an adversary can use the injected password to successfully authenticate as any domain user account (until the skeleton key is erased form memory by a reboot of the domain controller). Authenticated access may enable unfettered access to hosts and/or resources within single-factor authentication environments.

**An incredible post from Pentestlab can be found here it it’s a great resource and do check it out for this technique.**

{% embed url="<https://pentestlab.blog/2018/04/10/skeleton-key/>" %}


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