Драйвер LSASS
The Windows security subsystem is a set of components that manage and enforce the security policy for a computer or domain. The Local Security Authority (LSA) is the main component responsible for local security policy and user authentication. The LSA includes multiple dynamic link libraries (DLLs) associated with various other security functions, all of which run in the context of the LSA Subsystem Service (LSASS) lsass.exe process. (Citation: Microsoft Security Subsystem) Adversaries may target lsass.exe drivers to obtain execution and/or persistence. By either replacing or adding illegitimate drivers (e.g., DLL Side-Loading or DLL Search Order Hijacking), an adversary can achieve arbitrary code execution triggered by continuous LSA operations.
Контрмеры |
|
Контрмера | Описание |
---|---|
Restrict Library Loading |
Prevent abuse of library loading mechanisms in the operating system and software to load untrusted code by configuring appropriate library loading mechanisms and investigating potential vulnerable software. |
Credential Access Protection |
Use capabilities to prevent successful credential access by adversaries; including blocking forms of credential dumping. |
LSASS Driver Mitigation |
On Windows 8.1 and Server 2012 R2, enable LSA Protection by setting the Registry key |
Code Signing |
Enforce binary and application integrity with digital signature verification to prevent untrusted code from executing. |
Обнаружение
With LSA Protection enabled, monitor the event logs (Events 3033 and 3063) for failed attempts to load LSA plug-ins and drivers. (Citation: Microsoft LSA Protection Mar 2014) Utilize the Sysinternals Autoruns/Autorunsc utility (Citation: TechNet Autoruns) to examine loaded drivers associated with the LSA. Utilize the Sysinternals Process Monitor utility to monitor DLL load operations in lsass.exe. (Citation: Microsoft DLL Security)
Ссылки
- Microsoft. (n.d.). Dynamic-Link Library Security. Retrieved November 27, 2017.
- Russinovich, M. (2016, January 4). Autoruns for Windows v13.51. Retrieved June 6, 2016.
- Microsoft. (2014, March 12). Configuring Additional LSA Protection. Retrieved November 27, 2017.
- Microsoft. (n.d.). Security Subsystem Architecture. Retrieved November 27, 2017.
- Lich, B., Tobin, J. (2017, April 5). How Windows Defender Credential Guard works. Retrieved November 27, 2017.
- Lich, B., Tobin, J., Hall, J. (2017, April 5). Manage Windows Defender Credential Guard. Retrieved November 27, 2017.
Связанные риски
Каталоги
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