Account manipulation may aid adversaries in maintaining access to credentials and certain permission levels within an environment. Manipulation could consist of modifying permissions, modifying credentials, adding or changing permission groups, modifying account settings, or modifying how authentication is performed. These actions could also include account activity designed to subvert security policies, such as performing iterative password updates to subvert password duration policies and preserve the life of compromised credentials. In order to create or manipulate accounts, the adversary must already have sufficient permissions on systems or the domain.
|APT3||APT3 has been known to add created accounts to local admin groups to maintain elevated access. |
|Calisto||Calisto adds permissions and remote logins to all users. |
|Dragonfly 2.0||Dragonfly 2.0 added newly created accounts to the administrators group to maintain elevated access.  |
|Lazarus Group||Lazarus Group malware WhiskeyDelta-Two contains a function that attempts to rename the administrator’s account.  |
The Mimikatz credential dumper has been extended to include Skeleton Key domain controller authentication bypass functionality. The
|Skeleton Key||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. |
|Multi-factor Authentication||Use multi-factor authentication for user and privileged accounts.|
|Network Segmentation||Configure access controls and firewalls to limit access to critical systems and domain controllers.|
|Operating System Configuration||Protect domain controllers by ensuring proper security configuration for critical servers to limit access by potentially unnecessary protocols and services, such as SMB file sharing.|
|Privileged Account Management||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.  Monitor for modification of accounts in correlation with other suspicious activity. Changes may occur at unusual times or from unusual systems. Especially flag events where the subject and target accounts differ  or that include additional flags such as changing a password without knowledge of the old password. 
Use of credentials may also occur at unusual times or to unusual systems or services and may correlate with other suspicious activity.
- Metcalf, S. (2015, November 13). Unofficial Guide to Mimikatz & Command Reference. Retrieved December 23, 2015.
- 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.
- Pantig, J. (2018, July 30). OSX.Calisto. Retrieved September 7, 2018.
- Dell SecureWorks. (2015, January 12). Skeleton Key Malware Analysis. Retrieved April 8, 2019.
- Novetta Threat Research Group. (2016, February 24). Operation Blockbuster: Unraveling the Long Thread of the Sony Attack. Retrieved February 25, 2016.
- Novetta Threat Research Group. (2016, February 24). Operation Blockbuster: Destructive Malware Report. Retrieved March 2, 2016.
- valsmith. (2012, September 21). More on APTSim. Retrieved September 28, 2017.
- US-CERT. (2018, March 16). Alert (TA18-074A): Russian Government Cyber Activity Targeting Energy and Other Critical Infrastructure Sectors. Retrieved June 6, 2018.
- US-CERT. (2017, October 20). Alert (TA17-293A): Advanced Persistent Threat Activity Targeting Energy and Other Critical Infrastructure Sectors. Retrieved November 2, 2017.
- Lich, B., Miroshnikov, A. (2017, April 5). 4738(S): A user account was changed. Retrieved June 30, 2017.
- Warren, J. (2017, July 11). Manipulating User Passwords with Mimikatz. Retrieved December 4, 2017.
- Warren, J. (2017, June 22). lsadump::changentlm and lsadump::setntlm work, but generate Windows events #92. Retrieved December 4, 2017.