Defining DOS Devices

• Command-Prompt: subst (note: not persistent)
  subst X: "C:\some_target_folder"
• API-Call: DefineDosDevice (note: not persistent)
• Registry (note: persistent)
  "HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Dos Devices"

  Add a String Value "X:" where X is the new virtual drive and set the value to: "\DosDevices\C:\some_target_folder"

HelloWorld.asm

format PE GUI

entry main

section '.code' code readable executable

    _main:

        push 0

        push _message

        push _caption

        push 0

        call [MessageBoxA]

        push 0

        call [ExitProcess]

        ret

section '.data' data readable writeable

    _caption db 'Hello World',0

    _message db 'Hello World!',0

section '.idata' import data readable writeable

    dd 0,0,0,RVA kernel_name,RVA kernel_table

    dd 0,0,0,RVA user_name,RVA user_table

    dd 0,0,0,0,0

    kernel_table:

        ExitProcess dd RVA _ExitProcess

        dd 0

    user_table:

        MessageBoxA dd RVA _MessageBoxA

        dd 0

    kernel_name db 'Kernel32.dll',0

    user_name db 'User32.dll',0

    _ExitProcess dw 0

    db 'ExitProcess',0

    _MessageBoxA dw 0

    db 'MessageBoxA',0

section '.reloc' fixups data readable discardable

Hello World!

• Hello World!
• Bonjour Monde!
• Hallo Welt!
• ¡Hola Mundo!
• Ciao Mondo!
• Здравствулте! мир!