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Application Escape and Breakout

Summary

Gaining a command shell

  • Shortcut * [Window] + [R] -> cmd * [CTRL] + [ALT] + [SHIFT] -> Task Manager * [CTRL] + [ALT] + [DELETE] -> Task Manager
  • Access through file browser: Browsing to the folder containing the binary (i.e. C:\windows\system32\), we can simply right click and open it
  • Drag-and-drop: dragging and dropping any file onto the cmd.exe
  • Hyperlink: file:///c:/Windows/System32/cmd.exe
  • Task Manager: File > New Task (Run...) > cmd
  • MSPAINT.exe * Open MSPaint.exe and set the canvas size to: Width=6 and Height=1 pixels * Zoom in to make the following tasks easier * Using the colour picker, set pixels values to (from left to right): * 1st: R: 10, G: 0, B: 0 * 2nd: R: 13, G: 10, B: 13 * 3rd: R: 100, G: 109, B: 99 * 4th: R: 120, G: 101, B: 46 * 5th: R: 0, G: 0, B: 101 * 6th: R: 0, G: 0, B: 0 * Save it as 24-bit Bitmap (.bmp;.dib) * Change its extension from bmp to bat and run

Sticky Keys

  • Spawn the sticky keys dialog * Via Shell URI : shell:::{20D04FE0-3AEA-1069-A2D8-08002B30309D} * Hit 5 times [SHIFT]
  • Visit "Ease of Access Center"
  • You land on "Setup Sticky Keys", move up a level on "Ease of Access Center"
  • Start the OSK (On-Screen-Keyboard)
  • You can now use the keyboard shortcut (CTRL+N)

Dialog Boxes

Creating new files

  • Batch files – Right click > New > Text File > rename to .BAT (or .CMD) > edit > open
  • Shortcuts – Right click > New > Shortcut > %WINDIR%\system32

Open a new Windows Explorer instance

  • Right click any folder > select Open in new window

Exploring Context Menus

  • Right click any file/folder and explore context menus
  • Clicking Properties, especially on shortcuts, can yield further access via Open File Location

Save as

  • "Save as" / "Open as" option
  • "Print" feature – selecting "print to file" option (XPS/PDF/etc)
  • \\127.0.0.1\c$\Windows\System32\ and execute cmd.exe

Input Boxes

Many input boxes accept file paths; try all inputs with UNC paths such as //attacker–pc/ or //127.0.0.1/c$ or C:\

Bypass file restrictions

Enter . or *.exe or similar in File name box

Internet Explorer

Download and Run/Open

  • Text files -> opened by Notepad
  • The address bar
  • Search menus
  • Help menus
  • Print menus
  • All other menus that provide dialog boxes

Shell URI Handlers

  • shell:DocumentsLibrary
  • shell:Librariesshell:UserProfiles
  • shell:Personal
  • shell:SearchHomeFolder
  • shell:System shell:NetworkPlacesFolder
  • shell:SendTo
  • shell:Common Administrative Tools
  • shell:MyComputerFolder
  • shell:InternetFolder

References