Delphi : Analyze PE file headers?

{ You‘ll need a OpenDialog to open a Exe-File and a Memo to show the file informations }

{
  Man braucht einen OpenDialog um eine Exe-Datei zu öffnen und ein Memo,
  um die Informationen anzuzeigen.
}


procedure DumpDOSHeader(const h: IMAGE_DOS_HEADER; Lines: TStrings);
begin
  Lines.Add(‘Dump of DOS file header‘);
  Lines.Add(Format(‘Magic number: %d‘, [h.e_magic]));
  Lines.Add(Format(‘Bytes on last page of file: %d‘, [h.e_cblp]));
  Lines.Add(Format(‘Pages in file: %d‘, [h.e_cp]));
  Lines.Add(Format(‘Relocations: %d‘, [h.e_crlc]));
  Lines.Add(Format(‘Size of header in paragraphs: %d‘, [h.e_cparhdr]));
  Lines.Add(Format(‘Minimum extra paragraphs needed: %d‘, [h.e_minalloc]));
  Lines.Add(Format(‘Maximum extra paragraphs needed: %d‘, [h.e_maxalloc]));
  Lines.Add(Format(‘Initial (relative) SS value: %d‘, [h.e_ss]));
  Lines.Add(Format(‘Initial SP value: %d‘, [h.e_sp]));
  Lines.Add(Format(‘Checksum: %d‘, [h.e_csum]));
  Lines.Add(Format(‘Initial IP value: %d‘, [h.e_ip]));
  Lines.Add(Format(‘Initial (relative) CS value: %d‘, [h.e_cs]));
  Lines.Add(Format(‘File address of relocation table: %d‘, [h.e_lfarlc]));
  Lines.Add(Format(‘Overlay number: %d‘, [h.e_ovno]));
  Lines.Add(Format(‘OEM identifier (for e_oeminfo): %d‘, [h.e_oemid]));
  Lines.Add(Format(‘OEM information; e_oemid specific: %d‘, [h.e_oeminfo]));
  Lines.Add(Format(‘File address of new exe header: %d‘, [h._lfanew]));
  Lines.Add(‘‘);
end;

procedure DumpPEHeader(const h: IMAGE_FILE_HEADER; Lines: TStrings);
var
  dt: TDateTime;
begin
  Lines.Add(‘Dump of PE file header‘);
  Lines.Add(Format(‘Machine: %4x‘, [h.Machine]));
  case h.Machine of
    IMAGE_FILE_MACHINE_UNKNOWN : Lines.Add(‘ MACHINE_UNKNOWN ‘);
    IMAGE_FILE_MACHINE_I386: Lines.Add(‘ Intel 386. ‘);
    IMAGE_FILE_MACHINE_R3000: Lines.Add(‘ MIPS little-endian, 0x160 big-endian ‘);
    IMAGE_FILE_MACHINE_R4000: Lines.Add(‘ MIPS little-endian ‘);
    IMAGE_FILE_MACHINE_R10000: Lines.Add(‘ MIPS little-endian ‘);
    IMAGE_FILE_MACHINE_ALPHA: Lines.Add(‘ Alpha_AXP ‘);
    IMAGE_FILE_MACHINE_POWERPC: Lines.Add(‘ IBM PowerPC Little-Endian ‘);
    // some values no longer defined in winnt.h
    $14D: Lines.Add(‘ Intel i860‘);
    $268: Lines.Add(‘ Motorola 68000‘);
    $290: Lines.Add(‘ PA RISC‘);
    else
      Lines.Add(‘ unknown machine type‘);
  end; { Case }
  Lines.Add(Format(‘NumberOfSections: %d‘, [h.NumberOfSections]));
  Lines.Add(Format(‘TimeDateStamp: %d‘, [h.TimeDateStamp]));
  dt := EncodeDate(1970, 1, 1) + h.Timedatestamp / SecsPerDay;
  Lines.Add(FormatDateTime(‘ c‘, dt));

  Lines.Add(Format(‘PointerToSymbolTable: %d‘, [h.PointerToSymbolTable]));
  Lines.Add(Format(‘NumberOfSymbols: %d‘, [h.NumberOfSymbols]));
  Lines.Add(Format(‘SizeOfOptionalHeader: %d‘, [h.SizeOfOptionalHeader]));
  Lines.Add(Format(‘Characteristics: %d‘, [h.Characteristics]));
  if (IMAGE_FILE_DLL and h.Characteristics) <> 0 then
    Lines.Add(‘ file is a DLL‘)
  else if (IMAGE_FILE_EXECUTABLE_IMAGE and h.Characteristics) <> 0 then
    Lines.Add(‘ file is a program‘);
  Lines.Add(‘‘);
end;

procedure DumpOptionalHeader(const h: IMAGE_OPTIONAL_HEADER; Lines: TStrings);
begin
  Lines.Add(‘Dump of PE optional file header‘);
  Lines.Add(Format(‘Magic: %d‘, [h.Magic]));
  case h.Magic of
    $107: Lines.Add(‘ ROM image‘);
    $10b: Lines.Add(‘ executable image‘);
    else
      Lines.Add(‘ unknown image type‘);
  end; { If }
  Lines.Add(Format(‘MajorLinkerVersion: %d‘, [h.MajorLinkerVersion]));
  Lines.Add(Format(‘MinorLinkerVersion: %d‘, [h.MinorLinkerVersion]));
  Lines.Add(Format(‘SizeOfCode: %d‘, [h.SizeOfCode]));
  Lines.Add(Format(‘SizeOfInitializedData: %d‘, [h.SizeOfInitializedData]));
  Lines.Add(Format(‘SizeOfUninitializedData: %d‘, [h.SizeOfUninitializedData]));
  Lines.Add(Format(‘AddressOfEntryPoint: %d‘, [h.AddressOfEntryPoint]));
  Lines.Add(Format(‘BaseOfCode: %d‘, [h.BaseOfCode]));
  Lines.Add(Format(‘BaseOfData: %d‘, [h.BaseOfData]));
  Lines.Add(Format(‘ImageBase: %d‘, [h.ImageBase]));
  Lines.Add(Format(‘SectionAlignment: %d‘, [h.SectionAlignment]));
  Lines.Add(Format(‘FileAlignment: %d‘, [h.FileAlignment]));
  Lines.Add(Format(‘MajorOperatingSystemVersion: %d‘, [h.MajorOperatingSystemVersion]));
  Lines.Add(Format(‘MinorOperatingSystemVersion: %d‘, [h.MinorOperatingSystemVersion]));
  Lines.Add(Format(‘MajorImageVersion: %d‘, [h.MajorImageVersion]));
  Lines.Add(Format(‘MinorImageVersion: %d‘, [h.MinorImageVersion]));
  Lines.Add(Format(‘MajorSubsystemVersion: %d‘, [h.MajorSubsystemVersion]));
  Lines.Add(Format(‘MinorSubsystemVersion: %d‘, [h.MinorSubsystemVersion]));
  Lines.Add(Format(‘Win32VersionValue: %d‘, [h.Win32VersionValue]));
  Lines.Add(Format(‘SizeOfImage: %d‘, [h.SizeOfImage]));
  Lines.Add(Format(‘SizeOfHeaders: %d‘, [h.SizeOfHeaders]));
  Lines.Add(Format(‘CheckSum: %d‘, [h.CheckSum]));
  Lines.Add(Format(‘Subsystem: %d‘, [h.Subsystem]));
  case h.Subsystem of
    IMAGE_SUBSYSTEM_NATIVE:
      Lines.Add(‘ Image doesn‘‘t require a subsystem. ‘);
    IMAGE_SUBSYSTEM_WINDOWS_GUI:
      Lines.Add(‘ Image runs in the Windows GUI subsystem. ‘);
    IMAGE_SUBSYSTEM_WINDOWS_CUI:
      Lines.Add(‘ Image runs in the Windows character subsystem. ‘);
    IMAGE_SUBSYSTEM_OS2_CUI:
      Lines.Add(‘ image runs in the OS/2 character subsystem. ‘);
    IMAGE_SUBSYSTEM_POSIX_CUI:
      Lines.Add(‘ image run in the Posix character subsystem. ‘);
    else
      Lines.Add(‘ unknown subsystem‘)
  end; { Case }
  Lines.Add(Format(‘DllCharacteristics: %d‘, [h.DllCharacteristics]));
  Lines.Add(Format(‘SizeOfStackReserve: %d‘, [h.SizeOfStackReserve]));
  Lines.Add(Format(‘SizeOfStackCommit: %d‘, [h.SizeOfStackCommit]));
  Lines.Add(Format(‘SizeOfHeapReserve: %d‘, [h.SizeOfHeapReserve]));
  Lines.Add(Format(‘SizeOfHeapCommit: %d‘, [h.SizeOfHeapCommit]));
  Lines.Add(Format(‘LoaderFlags: %d‘, [h.LoaderFlags]));
  Lines.Add(Format(‘NumberOfRvaAndSizes: %d‘, [h.NumberOfRvaAndSizes]));
end;

// Example Call, Beispielaufruf:

procedure TForm1.Button1Click(Sender: TObject);
var
  fs: TFilestream;
  signature: DWORD;
  dos_header: IMAGE_DOS_HEADER;
  pe_header: IMAGE_FILE_HEADER;
  opt_header: IMAGE_OPTIONAL_HEADER;
begin
  memo1.Clear;
  with Opendialog1 do
  begin
    Filter := ‘Executables (*.EXE)|*.EXE‘;
    if Execute then
    begin
      fs := TFilestream.Create(FileName, fmOpenread or fmShareDenyNone);
      try
        fs.read(dos_header, SizeOf(dos_header));
        if dos_header.e_magic <> IMAGE_DOS_SIGNATURE then
        begin
          memo1.Lines.Add(‘Invalid DOS file header‘);
          Exit;
        end;
        DumpDOSHeader(dos_header, memo1.Lines);

        fs.seek(dos_header._lfanew, soFromBeginning);
        fs.read(signature, SizeOf(signature));
        if signature <> IMAGE_NT_SIGNATURE then
        begin
          memo1.Lines.Add(‘Invalid PE header‘);
          Exit;
        end;

        fs.read(pe_header, SizeOf(pe_header));
        DumpPEHeader(pe_header, memo1.Lines);

        if pe_header.SizeOfOptionalHeader > 0 then
        begin
          fs.read(opt_header, SizeOf(opt_header));
          DumpOptionalHeader(opt_header, memo1.Lines);
        end;
      finally
        fs.Free;
      end; { finally }
    end;
  end;
end;