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          ATT&CK-CN V1.01 Last Update: 2019-11 [返回索引頁]

          譯者: 林妙倩(清華大學網絡研究院網絡空間安全實習生)、戴亦侖(賽寧網安) 原創翻譯作品,如果需要轉載請取得翻譯作者同意。

          數據來源:ATT&CK Matrices

          原文: https://attack.mitre.org/techniques/T1158

          術語表: /attack/glossary

          隱藏文件和隱藏目錄

          為了防止普通用戶意外更改系統上的特殊文件,大多數操作系統都具有“隱藏”文件的概念。當用戶使用GUI瀏覽文件系統或在命令行上使用常規命令時,這些文件不會顯示。用戶必須通過一系列圖形用戶界面(GUI)提示或使用命令行開關(dir/a對于Windows以及ls –a的Linux和macOS)明確要求顯示隱藏文件。

          攻擊者可以利用此優勢來隱藏系統上任何位置的文件和文件夾,以實現持久性,并逃避不包含對隱藏文件的調查的典型用戶或系統分析。

          Hidden Files and Directories

          To prevent normal users from accidentally changing special files on a system, most operating systems have the concept of a ‘hidden’ file. These files don’t show up when a user browses the file system with a GUI or when using normal commands on the command line. Users must explicitly ask to show the hidden files either via a series of Graphical User Interface (GUI) prompts or with command line switches (dir /a for Windows and ls –a for Linux and macOS).

          Adversaries can use this to their advantage to hide files and folders anywhere on the system for persistence and evading a typical user or system analysis that does not incorporate investigation of hidden files.

          windows

          用戶可以使用attrib.exe二進制文件將特定文件標記為隱藏。只需attrib +h filename將文件或文件夾標記為隱藏即可。同樣,“ + s”將文件標記為系統文件,“ + r”標志將文件標記為只讀。像大多數Windows二進制文件一樣,attrib.exe二進制文件提供了以遞歸方式“ / S”應用這些更改的功能。

          Users can mark specific files as hidden by using the attrib.exe binary. Simply do attrib +h filename to mark a file or folder as hidden. Similarly, the "+s" marks a file as a system file and the "+r" flag marks the file as read only. Like most windows binaries, the attrib.exe binary provides the ability to apply these changes recursively "/S".

          Linux / Mac

          用戶只需將“.”標記為隱藏即可將其標記為隱藏。作為文件或文件夾名稱的第一個字符 。默認情況下,以“?!遍_頭的文件和文件夾在Finder應用程序和標準命令行實用程序(如“ ls”)中不會隱藏。用戶必須專門更改設置才能查看這些文件。對于命令行用法,通常會有一個標志來查看所有文件(包括隱藏文件)。要在Finder應用程序中查看這些文件,必須執行以下命令:defaults write com.apple.finder AppleShowAllFiles YES,然后重新啟動Finder應用程序。

          Users can mark specific files as hidden simply by putting a "." as the first character in the file or folder name . Files and folder that start with a period, ‘.’, are by default hidden from being viewed in the Finder application and standard command-line utilities like "ls". Users must specifically change settings to have these files viewable. For command line usages, there is typically a flag to see all files (including hidden ones). To view these files in the Finder Application, the following command must be executed: defaults write com.apple.finder AppleShowAllFiles YES, and then relaunch the Finder Application.

          蘋果電腦

          可以使用UF_HIDDEN標志標記macOS上的文件,這可以防止在Finder.app中看到它們,但仍然允許在Terminal.app 中看到它們。許多應用程序都會創建這些隱藏的文件和文件夾來存儲信息,以便不會使用戶的工作區變得混亂。例如,SSH實用程序創建一個.ssh文件夾,該文件夾已隱藏并且包含用戶的已知主機和密鑰。

          Files on macOS can be marked with the UF_HIDDEN flag which prevents them from being seen in Finder.app, but still allows them to be seen in Terminal.app . Many applications create these hidden files and folders to store information so that it doesn’t clutter up the user’s workspace. For example, SSH utilities create a .ssh folder that’s hidden and contains the user’s known hosts and keys.

          標簽

          ID編號: T1158

          策略: 繞過防御,持久化

          平臺: Linux,macOS,Windows

          所需權限:user

          數據源: 文件監視,過程監視,過程命令行參數

          繞過防御: 主機取證分析

          緩解措施

          這種攻擊技術無法通過預防性控制輕松緩解,因為它基于濫用系統功能。

          This type of attack technique cannot be easily mitigated with preventive controls since it is based on the abuse of system features.

          檢測

          監視文件系統和Shell命令,以查找帶有前導 "."”的文件。和Windows命令行使用attrib.exe添加隱藏屬性。

          Monitor the file system and shell commands for files being created with a leading "." and the Windows command-line use of attrib.exe to add the hidden attribut

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