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SECURITM это SGRC система, автоматизирующая процессы в службах информационной безопасности. SECURITM помогает построить и управлять ИСПДн, КИИ, ГИС, СМИБ/СУИБ, банковскими системами защиты.
А еще SECURITM это место для обмена опытом и наработками для служб безопасности.

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Modify Authentication Process: Password Filter DLL

Other sub-techniques of Modify Authentication Process (7)

ID	Name
.001	Domain Controller Authentication
.002	Password Filter DLL
.003	Pluggable Authentication Modules
.004	Network Device Authentication
.005	Reversible Encryption
.006	Multi-Factor Authentication
.007	Hybrid Identity

Adversaries may register malicious password filter dynamic link libraries (DLLs) into the authentication process to acquire user credentials as they are validated. Windows password filters are password policy enforcement mechanisms for both domain and local accounts. Filters are implemented as DLLs containing a method to validate potential passwords against password policies. Filter DLLs can be positioned on local computers for local accounts and/or domain controllers for domain accounts. Before registering new passwords in the Security Accounts Manager (SAM), the Local Security Authority (LSA) requests validation from each registered filter. Any potential changes cannot take effect until every registered filter acknowledges validation. Adversaries can register malicious password filters to harvest credentials from local computers and/or entire domains. To perform proper validation, filters must receive plain-text credentials from the LSA. A malicious password filter would receive these plain-text credentials every time a password request is made.(Citation: Carnal Ownage Password Filters Sept 2013)

ID: T1556.002

Sub-technique of: T1556

Tactic(s): Credential Access, Defense Evasion, Persistence

Platforms: Windows

Permissions Required: Administrator, SYSTEM

Data Sources: File: File Creation, Module: Module Load, Windows Registry: Windows Registry Key Modification

Version: 2.0

Created: 11 Feb 2020

Last Modified: 20 Apr 2021

Name	Description
Procedure Examples
Remsec	Remsec harvests plain-text credentials as a password filter registered on domain controllers.(Citation: Kaspersky ProjectSauron Full Report)
Strider	Strider has registered its persistence module on domain controllers as a Windows LSA (Local System Authority) password filter to acquire credentials any time a domain, local user, or administrator logs in or changes a password.(Citation: Kaspersky ProjectSauron Full Report)

Mitigation	Description
Mitigations
Operating System Configuration	Make configuration changes related to the operating system or a common feature of the operating system that result in system hardening against techniques.

Detection

Monitor for new, unfamiliar DLL files written to a domain controller and/or local computer. Monitor for changes to Registry entries for password filters (ex: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\Notification Packages) and correlate then investigate the DLL files these files reference. Password filters will also show up as an autorun and loaded DLL in lsass.exe.(Citation: Clymb3r Function Hook Passwords Sept 2013)

References

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