Access Token Manipulation: Создание токена и имперсонация
Other sub-techniques of Access Token Manipulation (5)
Adversaries may make new tokens and impersonate users to escalate privileges and bypass access controls. For example, if an adversary has a username and password but the user is not logged onto the system the adversary can then create a logon session for the user using the `LogonUser` function.(Citation: LogonUserW function) The function will return a copy of the new session's access token and the adversary can use `SetThreadToken` to assign the token to a thread. This behavior is distinct from Token Impersonation/Theft in that this refers to creating a new user token instead of stealing or duplicating an existing one.
Примеры процедур |
|
Название | Описание |
---|---|
Mafalda |
Mafalda can create a token for a different user.(Citation: SentinelLabs Metador Technical Appendix Sept 2022) |
BlackByte |
BlackByte constructed a valid authentication token following Microsoft Exchange exploitation to allow for follow-on privileged command execution.(Citation: Microsoft BlackByte 2023) |
FIN13 |
FIN13 has utilized tools such as Incognito V2 for token manipulation and impersonation.(Citation: Sygnia Elephant Beetle Jan 2022) |
SILENTTRINITY |
SILENTTRINITY can make tokens from known credentials.(Citation: Github_SILENTTRINITY) |
Cobalt Strike |
Cobalt Strike can make tokens from known credentials.(Citation: cobaltstrike manual) |
Cobalt Strike |
Cobalt Strike can make tokens from known credentials.(Citation: cobaltstrike manual) |
Контрмеры |
|
Контрмера | Описание |
---|---|
Privileged Account Management |
Privileged Account Management focuses on implementing policies, controls, and tools to securely manage privileged accounts (e.g., SYSTEM, root, or administrative accounts). This includes restricting access, limiting the scope of permissions, monitoring privileged account usage, and ensuring accountability through logging and auditing.This mitigation can be implemented through the following measures: Account Permissions and Roles: - Implement RBAC and least privilege principles to allocate permissions securely. - Use tools like Active Directory Group Policies to enforce access restrictions. Credential Security: - Deploy password vaulting tools like CyberArk, HashiCorp Vault, or KeePass for secure storage and rotation of credentials. - Enforce password policies for complexity, uniqueness, and expiration using tools like Microsoft Group Policy Objects (GPO). Multi-Factor Authentication (MFA): - Enforce MFA for all privileged accounts using Duo Security, Okta, or Microsoft Azure AD MFA. Privileged Access Management (PAM): - Use PAM solutions like CyberArk, BeyondTrust, or Thycotic to manage, monitor, and audit privileged access. Auditing and Monitoring: - Integrate activity monitoring into your SIEM (e.g., Splunk or QRadar) to detect and alert on anomalous privileged account usage. Just-In-Time Access: - Deploy JIT solutions like Azure Privileged Identity Management (PIM) or configure ephemeral roles in AWS and GCP to grant time-limited elevated permissions. *Tools for Implementation* Privileged Access Management (PAM): - CyberArk, BeyondTrust, Thycotic, HashiCorp Vault. Credential Management: - Microsoft LAPS (Local Admin Password Solution), Password Safe, HashiCorp Vault, KeePass. Multi-Factor Authentication: - Duo Security, Okta, Microsoft Azure MFA, Google Authenticator. Linux Privilege Management: - sudo configuration, SELinux, AppArmor. Just-In-Time Access: - Azure Privileged Identity Management (PIM), AWS IAM Roles with session constraints, GCP Identity-Aware Proxy. |
User Account Management |
User Account Management involves implementing and enforcing policies for the lifecycle of user accounts, including creation, modification, and deactivation. Proper account management reduces the attack surface by limiting unauthorized access, managing account privileges, and ensuring accounts are used according to organizational policies. This mitigation can be implemented through the following measures: Enforcing the Principle of Least Privilege - Implementation: Assign users only the minimum permissions required to perform their job functions. Regularly audit accounts to ensure no excess permissions are granted. - Use Case: Reduces the risk of privilege escalation by ensuring accounts cannot perform unauthorized actions. Implementing Strong Password Policies - Implementation: Enforce password complexity requirements (e.g., length, character types). Require password expiration every 90 days and disallow password reuse. - Use Case: Prevents adversaries from gaining unauthorized access through password guessing or brute force attacks. Managing Dormant and Orphaned Accounts - Implementation: Implement automated workflows to disable accounts after a set period of inactivity (e.g., 30 days). Remove orphaned accounts (e.g., accounts without an assigned owner) during regular account audits. - Use Case: Eliminates dormant accounts that could be exploited by attackers. Account Lockout Policies - Implementation: Configure account lockout thresholds (e.g., lock accounts after five failed login attempts). Set lockout durations to a minimum of 15 minutes. - Use Case: Mitigates automated attack techniques that rely on repeated login attempts. Multi-Factor Authentication (MFA) for High-Risk Accounts - Implementation: Require MFA for all administrative accounts and high-risk users. Use MFA mechanisms like hardware tokens, authenticator apps, or biometrics. - Use Case: Prevents unauthorized access, even if credentials are stolen. Restricting Interactive Logins - Implementation: Restrict interactive logins for privileged accounts to specific secure systems or management consoles. Use group policies to enforce logon restrictions. - Use Case: Protects sensitive accounts from misuse or exploitation. *Tools for Implementation* Built-in Tools: - Microsoft Active Directory (AD): Centralized account management and RBAC enforcement. - Group Policy Object (GPO): Enforce password policies, logon restrictions, and account lockout policies. Identity and Access Management (IAM) Tools: - Okta: Centralized user provisioning, MFA, and SSO integration. - Microsoft Azure Active Directory: Provides advanced account lifecycle management, role-based access, and conditional access policies. Privileged Account Management (PAM): - CyberArk, BeyondTrust, Thycotic: Manage and monitor privileged account usage, enforce session recording, and JIT access. |
Обнаружение
If an adversary is using a standard command-line shell, analysts can detect token manipulation by auditing command-line activity. Specifically, analysts should look for use of the runas
command. Detailed command-line logging is not enabled by default in Windows.(Citation: Microsoft Command-line Logging)
If an adversary is using a payload that calls the Windows token APIs directly, analysts can detect token manipulation only through careful analysis of user network activity, examination of running processes, and correlation with other endpoint and network behavior.
Analysts can also monitor for use of Windows APIs such as LogonUser
and SetThreadToken
and correlate activity with other suspicious behavior to reduce false positives that may be due to normal benign use by users and administrators.
Ссылки
- Strategic Cyber LLC. (2017, March 14). Cobalt Strike Manual. Retrieved May 24, 2017.
- Microsoft. (2023, March 10). LogonUserW function (winbase.h). Retrieved January 8, 2024.
- Mathers, B. (2017, March 7). Command line process auditing. Retrieved April 21, 2017.
- SentinelLabs. (2022, September 22). Metador Technical Appendix. Retrieved April 4, 2023.
- Microsoft Incident Response. (2023, July 6). The five-day job: A BlackByte ransomware intrusion case study. Retrieved December 16, 2024.
- Microsoft TechNet. (n.d.). Runas. Retrieved April 21, 2017.
- Brower, N., Lich, B. (2017, April 19). Replace a process level token. Retrieved December 19, 2017.
- Brower, N., Lich, B. (2017, April 19). Create a token object. Retrieved December 19, 2017.
- Sygnia Incident Response Team. (2022, January 5). TG2003: ELEPHANT BEETLE UNCOVERING AN ORGANIZED FINANCIAL-THEFT OPERATION. Retrieved February 9, 2023.
- byt3bl33d3r. (n.d.). SILENTTRINITY. Retrieved September 12, 2024.
- Strategic Cyber LLC. (2017, March 14). Cobalt Strike Manual. Retrieved May 24, 2017.
Связанные риски
Каталоги
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