Cервис управления информационной безопасностью
Cервис управления информационной безопасностью
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MITRE ATT&CK - Technique Group Policy Discovery
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MITRE ATT&CK
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Group Policy Discovery
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Group Policy Discovery

Adversaries may gather information on Group Policy settings to identify paths for privilege escalation, security measures applied within a domain, and to discover patterns in domain objects that can be manipulated or used to blend in the environment. Group Policy allows for centralized management of user and computer settings in Active Directory (AD). Group policy objects (GPOs) are containers for group policy settings made up of files stored within a predicable network path \\SYSVOL\\Policies\.(Citation: TechNet Group Policy Basics)(Citation: ADSecurity GPO Persistence 2016) Adversaries may use commands such as gpresult or various publicly available PowerShell functions, such as Get-DomainGPO and Get-DomainGPOLocalGroup, to gather information on Group Policy settings.(Citation: Microsoft gpresult)(Citation: Github PowerShell Empire) Adversaries may use this information to shape follow-on behaviors, including determining potential attack paths within the target network as well as opportunities to manipulate Group Policy settings (i.e. Domain Policy Modification) for their benefit.

ID: T1615
Tactic(s): Discovery
Platforms: Windows
Permissions Required: User
Data Sources: Active Directory: Active Directory Object Access, Command: Command Execution, Network Traffic: Network Traffic Content, Process: Process Creation, Script: Script Execution
Version: 1.0
Created: 06 Aug 2021
Last Modified: 15 Oct 2021

Procedure Examples
Name Description
BloodHound

BloodHound has the ability to collect local admin information via GPO.(Citation: GitHub Bloodhound)
Turla

Turla surveys a system upon check-in to discover Group Policy details using the gpresult command.(Citation: ESET ComRAT May 2020)
Empire

Empire includes various modules for enumerating Group Policy.(Citation: Github PowerShell Empire)
Emissary

Emissary has the capability to execute gpresult.(Citation: Emissary Trojan Feb 2016)

Detection

System and network discovery techniques normally occur throughout an operation as an adversary learns the environment. Data and events should not be viewed in isolation, but as part of a chain of behavior that could lead to other activities based on the information obtained. Monitor for suspicious use of gpresult. Monitor for the use of PowerShell functions such as Get-DomainGPO and Get-DomainGPOLocalGroup and processes spawning with command-line arguments containing GPOLocalGroup. Monitor for abnormal LDAP queries with filters for groupPolicyContainer and high volumes of LDAP traffic to domain controllers. Windows Event ID 4661 can also be used to detect when a directory service has been accessed.

References

  1. Schroeder, W., Warner, J., Nelson, M. (n.d.). Github PowerShellEmpire. Retrieved April 28, 2016.
  2. Microsoft. (2017, October 16). gpresult. Retrieved August 6, 2021.
  3. Metcalf, S. (2016, March 14). Sneaky Active Directory Persistence #17: Group Policy. Retrieved March 5, 2019.
  4. srachui. (2012, February 13). Group Policy Basics – Part 1: Understanding the Structure of a Group Policy Object. Retrieved March 5, 2019.
  5. Robbins, A., Vazarkar, R., and Schroeder, W. (2016, April 17). Bloodhound: Six Degrees of Domain Admin. Retrieved March 5, 2019.
  6. Falcone, R. and Miller-Osborn, J. (2016, February 3). Emissary Trojan Changelog: Did Operation Lotus Blossom Cause It to Evolve?. Retrieved February 15, 2016.
  7. Faou, M. (2020, May). From Agent.btz to ComRAT v4: A ten-year journey. Retrieved June 15, 2020.
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