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Attack: Boot or Logon Autostart Execution: LSASS Driver

Adversaries may modify or add LSASS drivers to obtain persistence on compromised systems. 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 drivers to obtain persistence. By either replacing or adding illegitimate drivers (e.g., Hijack Execution Flow), an adversary can use LSA operations to continuously execute malicious payloads.

MITRE

Tactic

technique

Test : Modify Registry to load Arbitrary DLL into LSASS - LsaDbExtPt

OS

Description:

The following Atomic will modify an undocumented registry key that may be abused to load a arbitrary DLL into LSASS.

Upon execution, the registry key will be modified and a value will contain the path to the DLL. Reference: https://blog.xpnsec.com/exploring-mimikatz-part-1/ and source https://github.com/oxfemale/LogonCredentialsSteal Note that if any LSA based protection is enabled, this will most likely not be successful with LSASS.exe loading the DLL.

Executor

powershell

Sigma Rule

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