Option Explicit
 
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Dest As Any, Src As Any, ByVal L As Long)
 
Private Enum ImageSignatureTypes
    IMAGE_DOS_SIGNATURE = &H5A4D     ''\\ MZ
    IMAGE_OS2_SIGNATURE = &H454E     ''\\ NE
    IMAGE_OS2_SIGNATURE_LE = &H454C  ''\\ LE
    IMAGE_VXD_SIGNATURE = &H454C     ''\\ LE
    IMAGE_NT_SIGNATURE = &H4550      ''\\ PE\0\0
End Enum
 
Private Type IMAGE_DOS_HEADER
    e_magic As Integer        ' Magic number
    e_cblp As Integer         ' Bytes on last page of file
    e_cp As Integer           ' Pages in file
    e_crlc As Integer         ' Relocations
    e_cparhdr As Integer      ' Size of header in paragraphs
    e_minalloc As Integer     ' Minimum extra paragraphs needed
    e_maxalloc As Integer     ' Maximum extra paragraphs needed
    e_ss As Integer           ' Initial (relative) SS value
    e_sp As Integer           ' Initial SP value
    e_csum As Integer         ' Checksum
    e_ip As Integer           ' Initial IP value
    e_cs As Integer           ' Initial (relative) CS value
    e_lfarlc As Integer       ' File address of relocation table
    e_ovno As Integer         ' Overlay number
    e_res(0 To 3) As Integer  ' Reserved words
    e_oemid As Integer        ' OEM identifier (for e_oeminfo)
    e_oeminfo As Integer      ' OEM information; e_oemid specific
    e_res2(0 To 9) As Integer ' Reserved words
    e_lfanew As Long          ' File address of new exe header
End Type
 
' MSDOS File header
Private Type IMAGE_FILE_HEADER
    Machine As Integer
    NumberOfSections As Integer
    TimeDateStamp As Long
    PointerToSymbolTable As Long
    NumberOfSymbols As Long
    SizeOfOptionalHeader As Integer
    characteristics As Integer
End Type
 
' Directory format.
Private Type IMAGE_DATA_DIRECTORY
    VirtualAddress As Long
    Size As Long
End Type
 
' Optional header format.
Const IMAGE_NUMBEROF_DIRECTORY_ENTRIES = 16
 
Private Type IMAGE_OPTIONAL_HEADER
    ' Standard fields.
    Magic As Integer
    MajorLinkerVersion As Byte
    MinorLinkerVersion As Byte
    SizeOfCode As Long
    SizeOfInitializedData As Long
    SizeOfUnitializedData As Long
    AddressOfEntryPoint As Long
    BaseOfCode As Long
    BaseOfData As Long
    ' NT additional fields.
    ImageBase As Long
    SectionAlignment As Long
    FileAlignment As Long
    MajorOperatingSystemVersion As Integer
    MinorOperatingSystemVersion As Integer
    MajorImageVersion As Integer
    MinorImageVersion As Integer
    MajorSubsystemVersion As Integer
    MinorSubsystemVersion As Integer
    W32VersionValue As Long
    SizeOfImage As Long
    SizeOfHeaders As Long
    CheckSum As Long
    SubSystem As Integer
    DllCharacteristics As Integer
    SizeOfStackReserve As Long
    SizeOfStackCommit As Long
    SizeOfHeapReserve As Long
    SizeOfHeapCommit As Long
    LoaderFlags As Long
    NumberOfRvaAndSizes As Long
    DataDirectory(0 To IMAGE_NUMBEROF_DIRECTORY_ENTRIES - 1) As IMAGE_DATA_DIRECTORY
End Type
 
Private Type IMAGE_NT_HEADERS
    Signature As Long
    FileHeader As IMAGE_FILE_HEADER
    OptionalHeader As IMAGE_OPTIONAL_HEADER
End Type
 
' Section header
Const IMAGE_SIZEOF_SHORT_NAME = 8
 
Private Type IMAGE_SECTION_HEADER
   SecName As String * IMAGE_SIZEOF_SHORT_NAME
   VirtualSize As Long
   VirtualAddress  As Long
   SizeOfRawData As Long
   PointerToRawData As Long
   PointerToRelocations As Long
   PointerToLinenumbers As Long
   NumberOfRelocations As Integer
   NumberOfLinenumbers As Integer
   characteristics  As Long
End Type
 
Public ByteArray() As Byte                  ' Byte array del archivo a leer
Public TempArray() As Byte                  ' Array temporal para reducir el ByteArray
Public Config()    As Byte                  ' La posible configuración del archivo leido
Public idh         As IMAGE_DOS_HEADER      ' Cabeceras
Public inh         As IMAGE_NT_HEADERS
Public ish()       As IMAGE_SECTION_HEADER
 
 
Sub RellenarPE(Ruta As String)
 
    Open Ruta For Binary As #1
      ReDim ByteArray(LOF(1) - 1)
      Get #1, , ByteArray
    Close #1
 
    ' Leemos el MS-DOS stub
    CopyMemory idh, ByteArray(0), Len(idh)
    If idh.e_magic <> IMAGE_DOS_SIGNATURE Then
       MsgBox "Formato PE no válido", vbCritical, "Small Crypter"
       Exit Sub
    End If
 
    ' Leemos a partir del PE\0\0 comletando a su vez:
    '   -> IMAGE_FILE_HEADER     (COFF File Header)
    '   -> IMAGE_OPTIONAL_HEADER (Optional  Header)
    CopyMemory inh, ByteArray(idh.e_lfanew), Len(inh)
    If inh.Signature <> IMAGE_NT_SIGNATURE Then
       MsgBox "Formato PE no válido", vbCritical, "Small Crypter"
       Exit Sub
    End If
 
    ' Leemos las distintas secciones
    Dim i As Integer
    ReDim ish(inh.FileHeader.NumberOfSections - 1)
    For i = 0 To inh.FileHeader.NumberOfSections - 1
        Call CopyMemory(ish(i), ByteArray(idh.e_lfanew + Len(inh) + Len(ish(i)) * i), Len(ish(i)))
    Next i
 
End Sub