|Platform||Windows Server 2003, Windows Server 2008, Windows Server 2012, Windows XP, Windows 7, Windows 8, Windows Server 2003 R2, Windows Server 2008 R2, Windows Server 2012 R2, Windows Vista, Windows 8.1, Windows 10|
|Data Sources||Authentication logs, API monitoring, Windows event logs|
Account manipulation may aid adversaries in maintaining access to credentials and certain permission levels within an environment. Manipulation could consist of modifying permissions, adding or changing permission groups, modifying account settings, or modifying how authentication is performed. In order to create or manipulate accounts, the adversary must already have sufficient permissions on systems or the domain.
- Lazarus Group malware WhiskeyDelta-Two contains a function that attempts to rename the administrator’s account.1
- The Mimikatz credential dumper has been extended to include Skeleton Key domain controller authentication bypass functionality.2
- Skeleton Key is used to patch an enterprise domain controller authentication process with a backdoor password. It allows adversaries to bypass the standard authentication system to use a defined password for all accounts authenticating to that domain controller.3
Use multifactor authentication. Follow guidelines to prevent or limit adversary access to Valid Accounts.
Protect domain controllers by ensuring proper security configuration for critical servers. Configure access controls and firewalls to limit access to these systems. Do not allow domain administrator accounts to be used for day-to-day operations that may expose them to potential adversaries on unprivileged systems.
Collect events that correlate with changes to account objects on systems and the domain, such as event ID 4738.4 Monitor for modification of accounts in correlation with other suspicious activity. Changes may occur at unusual times or from unusual systems.
Use of credentials may also occur at unusual times or to unusual systems or services and may correlate with other suspicious activity.
- Novetta Threat Research Group. (2016, February 24). Operation Blockbuster: Destructive Malware Report. Retrieved March 2, 2016.
- Metcalf, S. (2015, January 19). Attackers Can Now Use Mimikatz to Implant Skeleton Key on Domain Controllers & BackDoor Your Active Directory Forest. Retrieved February 3, 2015.