Account Access Removal
Adversaries may interrupt availability of system and network resources by inhibiting access to accounts utilized by legitimate users. Accounts may be deleted, locked, or manipulated (ex: changed credentials) to remove access to accounts. Adversaries may also subsequently log off and/or perform a System Shutdown/Reboot to set malicious changes into place.(Citation: CarbonBlack LockerGoga 2019)(Citation: Unit42 LockerGoga 2019)
In Windows, Net utility, Set-LocalUser and Set-ADAccountPassword PowerShell cmdlets may be used by adversaries to modify user accounts. In Linux, the passwd utility may be used to change passwords. Accounts could also be disabled by Group Policy.
Adversaries who use ransomware may first perform this and other Impact behaviors, such as Data Destruction and Defacement, before completing the Data Encrypted for Impact objective.
Procedure Examples |
|
| Name | Description |
|---|---|
| MegaCortex |
MegaCortex has changed user account passwords and logged users off the system.(Citation: IBM MegaCortex) |
| LockerGoga |
LockerGoga has been observed changing account passwords and logging off current users.(Citation: CarbonBlack LockerGoga 2019)(Citation: Unit42 LockerGoga 2019) |
| Meteor |
Meteor has the ability to change the password of local users on compromised hosts and can log off users.(Citation: Check Point Meteor Aug 2021) |
| LAPSUS$ |
LAPSUS$ has removed a targeted organization's global admin accounts to lock the organization out of all access.(Citation: MSTIC DEV-0537 Mar 2022) |
Detection
Use process monitoring to monitor the execution and command line parameters of binaries involved in deleting accounts or changing passwords, such as use of Net. Windows event logs may also designate activity associated with an adversary's attempt to remove access to an account: * Event ID 4723 - An attempt was made to change an account's password * Event ID 4724 - An attempt was made to reset an account's password * Event ID 4726 - A user account was deleted * Event ID 4740 - A user account was locked out Alerting on Net and these Event IDs may generate a high degree of false positives, so compare against baseline knowledge for how systems are typically used and correlate modification events with other indications of malicious activity where possible.
References
- Harbison, M. (2019, March 26). Born This Way? Origins of LockerGoga. Retrieved April 16, 2019.
- CarbonBlack Threat Analysis Unit. (2019, March 22). TAU Threat Intelligence Notification – LockerGoga Ransomware. Retrieved April 16, 2019.
- Del Fierro, C. Kessem, L.. (2020, January 8). From Mega to Giga: Cross-Version Comparison of Top MegaCortex Modifications. Retrieved February 15, 2021.
- Check Point Research Team. (2021, August 14). Indra - Hackers Behind Recent Attacks on Iran. Retrieved February 17, 2022.
- MSTIC, DART, M365 Defender. (2022, March 24). DEV-0537 Criminal Actor Targeting Organizations for Data Exfiltration and Destruction. Retrieved May 17, 2022.
Связанные риски
| Риск | Связи | |
|---|---|---|
|
Неработоспособность информационной системы из-за
возможности удаления учетных записей в доменных службах Active Directory
Доступность
Отказ в обслуживании
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Каталоги
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