Cервис управления информационной безопасностью
Cервис управления информационной безопасностью
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MITRE ATT&CK - Technique Time Providers
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MITRE ATT&CK
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MITRE ATT&CK
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Time Providers
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Boot or Logon Autostart Execution:  Time Providers

ID Name
.001 Registry Run Keys / Startup Folder
.002 Authentication Package
.003 Time Providers
.004 Winlogon Helper DLL
.005 Security Support Provider
.006 Kernel Modules and Extensions
.007 Re-opened Applications
.008 LSASS Driver
.009 Shortcut Modification
.010 Port Monitors
.011 Plist Modification
.012 Print Processors
.013 XDG Autostart Entries
.014 Active Setup
.015 Login Items

Adversaries may abuse time providers to execute DLLs when the system boots. The Windows Time service (W32Time) enables time synchronization across and within domains.(Citation: Microsoft W32Time Feb 2018) W32Time time providers are responsible for retrieving time stamps from hardware/network resources and outputting these values to other network clients.(Citation: Microsoft TimeProvider) Time providers are implemented as dynamic-link libraries (DLLs) that are registered in the subkeys of HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\W32Time\TimeProviders\.(Citation: Microsoft TimeProvider) The time provider manager, directed by the service control manager, loads and starts time providers listed and enabled under this key at system startup and/or whenever parameters are changed.(Citation: Microsoft TimeProvider) Adversaries may abuse this architecture to establish persistence, specifically by registering and enabling a malicious DLL as a time provider. Administrator privileges are required for time provider registration, though execution will run in context of the Local Service account.(Citation: Github W32Time Oct 2017)

ID: T1547.003
Sub-technique of:  T1547
Tactic(s): Persistence, Privilege Escalation
Platforms: Windows
Permissions Required: Administrator, SYSTEM
Data Sources: Command: Command Execution, Module: Module Load, Process: Process Creation, Windows Registry: Windows Registry Key Modification
Version: 1.0
Created: 24 Jan 2020
Last Modified: 20 Apr 2022

Mitigations
Mitigation Description
Restrict Registry Permissions

Restrict the ability to modify certain hives or keys in the Windows Registry.
Restrict File and Directory Permissions

Restrict access by setting directory and file permissions that are not specific to users or privileged accounts.

Detection

Baseline values and monitor/analyze activity related to modifying W32Time information in the Registry, including application programming interface (API) calls such as RegCreateKeyEx and RegSetValueEx as well as execution of the W32tm.exe utility.(Citation: Microsoft W32Time May 2017) There is no restriction on the number of custom time providers registrations, though each may require a DLL payload written to disk.(Citation: Github W32Time Oct 2017) The Sysinternals Autoruns tool may also be used to analyze auto-starting locations, including DLLs listed as time providers.(Citation: TechNet Autoruns)

References

  1. Russinovich, M. (2016, January 4). Autoruns for Windows v13.51. Retrieved June 6, 2016.
  2. Microsoft. (n.d.). Time Provider. Retrieved March 26, 2018.
  3. Microsoft. (2018, February 1). Windows Time Service (W32Time). Retrieved March 26, 2018.
  4. Mathers, B. (2017, May 31). Windows Time Service Tools and Settings. Retrieved March 26, 2018.
  5. Lundgren, S. (2017, October 28). w32time. Retrieved March 26, 2018.
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