Mega Code Archive
How to analyze PE file headers
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Title: How to analyze PE file headers
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;
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