Прямой доступ к тому
Adversaries may directly access a volume to bypass file access controls and file system monitoring. Windows allows programs to have direct access to logical volumes. Programs with direct access may read and write files directly from the drive by analyzing file system data structures. This technique bypasses Windows file access controls as well as file system monitoring tools. (Citation: Hakobyan 2009) Utilities, such as NinjaCopy, exist to perform these actions in PowerShell. (Citation: Github PowerSploit Ninjacopy)
Контрмеры |
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| Контрмера | Описание |
|---|---|
| File System Logical Offsets Mitigation |
Identify potentially malicious software that may be used to access logical drives in this manner, and audit and/or block it by using whitelisting (Citation: Beechey 2010) tools, like AppLocker, (Citation: Windows Commands JPCERT) (Citation: NSA MS AppLocker) or Software Restriction Policies (Citation: Corio 2008) where appropriate. (Citation: TechNet Applocker vs SRP) |
Обнаружение
Monitor handle opens on drive volumes that are made by processes to determine when they may directly access logical drives. (Citation: Github PowerSploit Ninjacopy) Monitor processes and command-line arguments for actions that could be taken to copy files from the logical drive and evade common file system protections. Since this technique may also be used through PowerShell, additional logging of PowerShell scripts is recommended.
Связанные риски
| Риск | Связи | |
|---|---|---|
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Обход систем защиты из-за
возможности получения прямого доступа к тому (volume) в ОС Windows
Повышение привилегий
Целостность
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Каталоги
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