PETools/Get-ObjDump.ps1
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function Get-ObjDump { <# .SYNOPSIS Displays information about one or more Windows object files. PowerSploit Function: Get-ObjDump Author: Matthew Graeber (@mattifestation) License: BSD 3-Clause Required Dependencies: None Optional Dependencies: None .DESCRIPTION Get-ObjDump parses and returns nearly identical infomation as the dumpbin utility. By nature of Get-ObjDump returning objects though, it lends itself much better to manipulation since every field is an object. .PARAMETER Path Specifies a path to one or more object file locations. .EXAMPLE C:\PS>Get-ObjDump -Path main.obj .EXAMPLE C:\PS>ls *.obj | Get-ObjDump .EXAMPLE C:\PS>$ObjectFile = Get-ObjDump -Path shellcode.obj C:\PS>$CodeBytes = $ObjectFile.SectionHeaders | ? {$_.Name -eq '.text'} | % {$_.RawData} Description ----------- Pulls the raw bytes out of the text section. Note that in this form, no relocations have been fixed up. .INPUTS System.String[] You can pipe a file system path (in quotation marks) to Get-ObjDump. .OUTPUTS COFF.OBJECT_FILE .LINK http://www.exploit-monday.com/ #> [CmdletBinding()] Param ( [Parameter(Position = 0, Mandatory = $True, ValueFromPipeline = $True)] [ValidateScript({ Test-Path $_ })] [String[]] $Path ) BEGIN { $Code = @' using System; using System.IO; using System.Text; namespace COFF { public enum Machine : ushort { UNKNOWN = 0, I386 = 0x014C, // Intel 386. R3000 = 0x0162, // MIPS little-endian =0x160 big-endian R4000 = 0x0166, // MIPS little-endian R10000 = 0x0168, // MIPS little-endian WCEMIPSV2 = 0x0169, // MIPS little-endian WCE v2 ALPHA = 0x0184, // Alpha_AXP SH3 = 0x01A2, // SH3 little-endian SH3DSP = 0x01A3, SH3E = 0x01A4, // SH3E little-endian SH4 = 0x01A6, // SH4 little-endian SH5 = 0x01A8, // SH5 ARM = 0x01C0, // ARM Little-Endian THUMB = 0x01C2, ARMV7 = 0x01C4, // ARM Thumb-2 Little-Endian AM33 = 0x01D3, POWERPC = 0x01F0, // IBM PowerPC Little-Endian POWERPCFP = 0x01F1, IA64 = 0x0200, // Intel 64 MIPS16 = 0x0266, // MIPS ALPHA64 = 0x0284, // ALPHA64 MIPSFPU = 0x0366, // MIPS MIPSFPU16 = 0x0466, // MIPS AXP64 = ALPHA64, TRICORE = 0x0520, // Infineon CEF = 0x0CEF, EBC = 0x0EBC, // EFI public byte Code AMD64 = 0x8664, // AMD64 (K8) M32R = 0x9041, // M32R little-endian ARM64 = 0xAA64, // ARMv8 in 64-bit mode CEE = 0xC0EE } [Flags] public enum CoffHeaderCharacteristics : ushort { RELOCS_STRIPPED = 0x0001, // Relocation info stripped from file. EXECUTABLE_IMAGE = 0x0002, // File is executable (i.e. no unresolved external references). LINE_NUMS_STRIPPED = 0x0004, // Line nunbers stripped from file. LOCAL_SYMS_STRIPPED = 0x0008, // Local symbols stripped from file. AGGRESIVE_WS_TRIM = 0x0010, // Agressively trim working set LARGE_ADDRESS_AWARE = 0x0020, // App can handle >2gb addresses REVERSED_LO = 0x0080, // public bytes of machine public ushort are reversed. BIT32_MACHINE = 0x0100, // 32 bit public ushort machine. DEBUG_STRIPPED = 0x0200, // Debugging info stripped from file in .DBG file REMOVABLE_RUN_FROM_SWAP = 0x0400, // If Image is on removable media =copy and run from the swap file. NET_RUN_FROM_SWAP = 0x0800, // If Image is on Net =copy and run from the swap file. SYSTEM = 0x1000, // System File. DLL = 0x2000, // File is a DLL. UP_SYSTEM_ONLY = 0x4000, // File should only be run on a UP machine REVERSED_HI = 0x8000 // public bytes of machine public ushort are reversed. } public class HEADER { public Machine Machine; public ushort NumberOfSections; public DateTime TimeDateStamp; public uint PointerToSymbolTable; public uint NumberOfSymbols; public ushort SizeOfOptionalHeader; public CoffHeaderCharacteristics Characteristics; public HEADER(BinaryReader br) { this.Machine = (Machine) br.ReadUInt16(); this.NumberOfSections = br.ReadUInt16(); this.TimeDateStamp = (new DateTime(1970, 1, 1, 0, 0, 0)).AddSeconds(br.ReadUInt32()); this.PointerToSymbolTable = br.ReadUInt32(); this.NumberOfSymbols = br.ReadUInt32(); this.SizeOfOptionalHeader = br.ReadUInt16(); this.Characteristics = (CoffHeaderCharacteristics) br.ReadUInt16(); } } [Flags] public enum SectionHeaderCharacteristics : uint { TYPE_NO_PAD = 0x00000008, // Reserved. CNT_CODE = 0x00000020, // Section contains code. CNT_INITIALIZED_DATA = 0x00000040, // Section contains initialized data. CNT_UNINITIALIZED_DATA = 0x00000080, // Section contains uninitialized data. LNK_INFO = 0x00000200, // Section contains comments or some other type of information. LNK_REMOVE = 0x00000800, // Section contents will not become part of image. LNK_COMDAT = 0x00001000, // Section contents comdat. NO_DEFER_SPEC_EXC = 0x00004000, // Reset speculative exceptions handling bits in the TLB entries for this section. GPREL = 0x00008000, // Section content can be accessed relative to GP MEM_FARDATA = 0x00008000, MEM_PURGEABLE = 0x00020000, MEM_16BIT = 0x00020000, MEM_LOCKED = 0x00040000, MEM_PRELOAD = 0x00080000, ALIGN_1BYTES = 0x00100000, ALIGN_2BYTES = 0x00200000, ALIGN_4BYTES = 0x00300000, ALIGN_8BYTES = 0x00400000, ALIGN_16BYTES = 0x00500000, // Default alignment if no others are specified. ALIGN_32BYTES = 0x00600000, ALIGN_64BYTES = 0x00700000, ALIGN_128BYTES = 0x00800000, ALIGN_256BYTES = 0x00900000, ALIGN_512BYTES = 0x00A00000, ALIGN_1024BYTES = 0x00B00000, ALIGN_2048BYTES = 0x00C00000, ALIGN_4096BYTES = 0x00D00000, ALIGN_8192BYTES = 0x00E00000, ALIGN_MASK = 0x00F00000, LNK_NRELOC_OVFL = 0x01000000, // Section contains extended relocations. MEM_DISCARDABLE = 0x02000000, // Section can be discarded. MEM_NOT_CACHED = 0x04000000, // Section is not cachable. MEM_NOT_PAGED = 0x08000000, // Section is not pageable. MEM_SHARED = 0x10000000, // Section is shareable. MEM_EXECUTE = 0x20000000, // Section is executable. MEM_READ = 0x40000000, // Section is readable. MEM_WRITE = 0x80000000 // Section is writeable. } public enum AMD64RelocationType : ushort { ABSOLUTE, ADDR64, ADDR32, ADDR32NB, REL32, REL32_1, REL32_2, REL32_3, REL32_4, REL32_5, SECTION, SECREL, SECREL7, TOKEN, SREL32, PAIR, SSPAN32 } public enum ARMRelocationType : ushort { ABSOLUTE, ADDR32, ADDR32NB, BRANCH24, BRANCH11, TOKEN, BLX24 = 0x08, BLX11 = 0x09, SECTION = 0x0E, SECREL = 0x0F, MOV32A = 0x10, MOV32T = 0x11, BRANCH20T = 0x12, BRANCH24T = 0x14, BLX23T = 0x15 } public enum ARMv8RelocationType : ushort { ABSOLUTE, ADDR32, ADDR32NB, BRANCH26, PAGEBASE_REL21, REL21, PAGEOFFSET_12A, PAGEOFFSET_12L, SECREL, SECREL_LOW12A, SECREL_HIGH12A, SECREL_LOW12L, TOKEN, SECTION, ADDR64 } public enum X86RelocationType : ushort { ABSOLUTE, DIR16, DIR32 = 0x06, DIR32NB = 0x07, SEG12 = 0x09, SECTION = 0x0A, SECREL = 0x0B, TOKEN = 0x0C, SECREL7 = 0x0D, REL32 = 0x14 } public class RelocationEntry { public uint VirtualAddress; public uint SymbolTableIndex; public Enum Type; public string Name; public RelocationEntry(BinaryReader br) { this.VirtualAddress = br.ReadUInt32(); this.SymbolTableIndex = br.ReadUInt32(); // Default to X86RelocationType. This will be changed once the processor type is determined this.Type = (X86RelocationType) br.ReadUInt16(); } } public class SECTION_HEADER { public string Name; public uint PhysicalAddress; public uint VirtualSize; public uint VirtualAddress; public uint SizeOfRawData; public uint PointerToRawData; public uint PointerToRelocations; public uint PointerToLinenumbers; public ushort NumberOfRelocations; public ushort NumberOfLinenumbers; public SectionHeaderCharacteristics Characteristics; public Byte[] RawData; public RelocationEntry[] Relocations; public SECTION_HEADER(BinaryReader br) { this.Name = Encoding.UTF8.GetString(br.ReadBytes(8)).Split((Char) 0)[0]; this.PhysicalAddress = br.ReadUInt32(); this.VirtualSize = this.PhysicalAddress; this.VirtualAddress = br.ReadUInt32(); this.SizeOfRawData = br.ReadUInt32(); this.PointerToRawData = br.ReadUInt32(); this.PointerToRelocations = br.ReadUInt32(); this.PointerToLinenumbers = br.ReadUInt32(); this.NumberOfRelocations = br.ReadUInt16(); this.NumberOfLinenumbers = br.ReadUInt16(); this.Characteristics = (SectionHeaderCharacteristics) br.ReadUInt32(); } } public enum SectionNumber : short { UNDEFINED, ABSOLUTE = -1, DEBUG = -2 } [Flags] public enum TypeClass : short { TYPE_NULL, TYPE_VOID, TYPE_CHAR, TYPE_SHORT, TYPE_INT, TYPE_LONG, TYPE_FLOAT, TYPE_DOUBLE, TYPE_STRUCT, TYPE_UNION, TYPE_ENUM, TYPE_MOE, TYPE_BYTE, TYPE_WORD, TYPE_UINT, TYPE_DWORD, DTYPE_POINTER = 0x100, DTYPE_FUNCTION = 0x200, DTYPE_ARRAY = 0x300, DTYPE_NULL = 0x400 // Technically, this is defined as 0 in the MSB } public enum StorageClass : byte { NULL, AUTOMATIC, EXTERNAL, STATIC, REGISTER, EXTERNAL_DEF, LABEL, UNDEFINED_LABEL, MEMBER_OF_STRUCT, ARGUMENT, STRUCT_TAG, MEMBER_OF_UNION, UNION_TAG, TYPE_DEFINITION, ENUM_TAG, MEMBER_OF_ENUM, REGISTER_PARAM, BIT_FIELD, BLOCK = 0x64, FUNCTION = 0x65, END_OF_STRUCT = 0x66, FILE = 0x67, SECTION = 0x68, WEAK_EXTERNAL = 0x69, CLR_TOKEN = 0x6B, END_OF_FUNCTION = 0xFF } public class SYMBOL_TABLE { public string Name; public uint Value; public SectionNumber SectionNumber; public TypeClass Type; public StorageClass StorageClass; public byte NumberOfAuxSymbols; public Object AuxSymbols; private Byte[] NameArray; public SYMBOL_TABLE(BinaryReader br) { this.NameArray = br.ReadBytes(8); if (this.NameArray[0] == 0 && this.NameArray[1] == 0 &&this.NameArray[2] == 0 &&this.NameArray[3] == 0) { // Per specification, if the high DWORD is 0, then then low DWORD is an index into the string table this.Name = "/" + BitConverter.ToInt32(NameArray, 4).ToString(); } else { this.Name = Encoding.UTF8.GetString(NameArray).Trim(((char) 0)); } this.Value = br.ReadUInt32(); this.SectionNumber = (SectionNumber) br.ReadInt16(); this.Type = (TypeClass) br.ReadInt16(); if ((((int) this.Type) & 0xff00) == 0) { this.Type = (TypeClass) Enum.Parse(typeof(TypeClass), ((int) this.Type | 0x400).ToString());} this.StorageClass = (StorageClass) br.ReadByte(); this.NumberOfAuxSymbols = br.ReadByte(); } } public class SECTION_DEFINITION { public uint Length; public ushort NumberOfRelocations; public ushort NumberOfLinenumbers; public uint CheckSum; public ushort Number; public byte Selection; public SECTION_DEFINITION(BinaryReader br) { this.Length = br.ReadUInt32(); this.NumberOfRelocations = br.ReadUInt16(); this.NumberOfLinenumbers = br.ReadUInt16(); this.CheckSum = br.ReadUInt32(); this.Number = br.ReadUInt16(); this.Selection = br.ReadByte(); br.ReadBytes(3); } } } '@ Add-Type -TypeDefinition $Code function Dispose-Objects { $BinaryReader.Dispose() $FileStream.Dispose() } } PROCESS { foreach ($File in $Path) { # Resolve the absolute path of the object file. [IO.File]::OpenRead requires an absolute path. $ObjFilePath = Resolve-Path $File # Pull out just the file name $ObjFileName = Split-Path $ObjFilePath -Leaf # Fixed structure sizes $SizeofCOFFFileHeader = 20 $SizeofSectionHeader = 40 $SizeofSymbolTableEntry = 18 $SizeofRelocationEntry = 10 # Open the object file for reading $FileStream = [IO.File]::OpenRead($ObjFilePath) $FileLength = $FileStream.Length if ($FileLength -lt $SizeofCOFFFileHeader) { # You cannot parse the COFF header if the file is not big enough to contain a COFF header. Write-Error "$($ObjFileName) is too small to store a COFF header." Dispose-Objects return } # Open a BinaryReader object for the object file $BinaryReader = New-Object IO.BinaryReader($FileStream) # Parse the COFF header $CoffHeader = New-Object COFF.HEADER($BinaryReader) if ($CoffHeader.SizeOfOptionalHeader -ne 0) { # Per the PECOFF specification, an object file does not have an optional header Write-Error "Coff header indicates the existence of an optional header. An object file cannot have an optional header." Dispose-Objects return } if ($CoffHeader.PointerToSymbolTable -eq 0) { Write-Error 'An object file is supposed to have a symbol table.' Dispose-Objects return } if ($FileLength -lt (($CoffHeader.NumberOfSections * $SizeofSectionHeader) + $SizeofCOFFFileHeader)) { # The object file isn't big enough to store the number of sections present. Write-Error "$($ObjFileName) is too small to store section header data." Dispose-Objects return } # A string collection used to store section header names. This collection is referenced while # parsing the symbol table entries whose name is the same as the section header. In this case, # the symbol entry will have a particular auxiliary symbol table entry. $SectionHeaderNames = New-Object Collections.Specialized.StringCollection # Correlate the processor type to the relocation type. There are more relocation type defined # in the PECOFF specification, but I don't expect those to be present. In that case, relocation # entries default to X86RelocationType. $SectionHeaders = New-Object COFF.SECTION_HEADER[]($CoffHeader.NumberOfSections) $MachineTypes = @{ [COFF.Machine]::I386 = [COFF.X86RelocationType] [COFF.Machine]::AMD64 = [COFF.AMD64RelocationType] [COFF.Machine]::ARMV7 = [COFF.ARMRelocationType] [COFF.Machine]::ARM64 = [COFF.ARMv8RelocationType] } # Parse section headers for ($i = 0; $i -lt $CoffHeader.NumberOfSections; $i++) { $SectionHeaders[$i] = New-Object COFF.SECTION_HEADER($BinaryReader) # Add the section name to the string collection. This will be referenced during symbol table parsing. $SectionHeaderNames.Add($SectionHeaders[$i].Name) | Out-Null # Save the current filestream position. We are about to jump out of place. $SavedFilePosition = $FileStream.Position # Check to see if the raw data points beyond the actual file size if (($SectionHeaders[$i].PointerToRawData + $SectionHeaders[$i].SizeOfRawData) -gt $FileLength) { Write-Error "$($SectionHeaders[$i].Name) section header's raw data exceeds the size of the object file." return } else { # Read the raw data into a byte array $FileStream.Seek($SectionHeaders[$i].PointerToRawData, 'Begin') | Out-Null $SectionHeaders[$i].RawData = $BinaryReader.ReadBytes($SectionHeaders[$i].SizeOfRawData) } # Check to see if the section has a relocation table if ($SectionHeaders[$i].PointerToRelocations -and $SectionHeaders[$i].NumberOfRelocations) { # Check to see if the relocation entries point beyond the actual file size if (($SectionHeaders[$i].PointerToRelocations + ($SizeofRelocationEntry * $SectionHeaders[$i].NumberOfRelocations)) -gt $FileLength) { Write-Error "$($SectionHeaders[$i].Name) section header's relocation entries exceeds the soze of the object file." return } $FileStream.Seek($SectionHeaders[$i].PointerToRelocations, 'Begin') | Out-Null $Relocations = New-Object COFF.RelocationEntry[]($SectionHeaders[$i].NumberOfRelocations) for ($j = 0; $j -lt $SectionHeaders[$i].NumberOfRelocations; $j++) { $Relocations[$j] = New-Object COFF.RelocationEntry($BinaryReader) # Cast the relocation as its respective type $Relocations[$j].Type = ($Relocations[$j].Type.value__ -as $MachineTypes[$CoffHeader.Machine]) } # Add the relocation table entry to the section header $SectionHeaders[$i].Relocations = $Relocations } # Restore the original filestream pointer $FileStream.Seek($SavedFilePosition, 'Begin') | Out-Null } # Retrieve the contents of the COFF string table $SymTableSize = $CoffHeader.NumberOfSymbols * $SizeofSymbolTableEntry $StringTableOffset = $CoffHeader.PointerToSymbolTable + $SymTableSize if ($StringTableOffset -gt $FileLength) { Write-Error 'The string table points beyond the end of the file.' Dispose-Objects return } $FileStream.Seek($StringTableOffset, 'Begin') | Out-Null $StringTableLength = $BinaryReader.ReadUInt32() if ($StringTableLength -gt $FileLength) { Write-Error "The string table's length exceeds the length of the file." Dispose-Objects return } $StringTable = [Text.Encoding]::UTF8.GetString($BinaryReader.ReadBytes($StringTableLength)) $RawSymbolTable = New-Object COFF.SYMBOL_TABLE[]($CoffHeader.NumberOfSymbols) # Retrieve the symbol table if ($FileLength -lt $StringTableOffset) { "Symbol table is larger than the file size." return } $FileStream.Seek($CoffHeader.PointerToSymbolTable, 'Begin') | Out-Null $NumberofRegularSymbols = 0 <# Go through each symbol table looking for auxiliary symbols to parse Currently supported auxiliary symbol table entry formats: 1) .file 2) Entry names that match the name of a section header #> for ($i = 0; $i -lt $CoffHeader.NumberOfSymbols; $i++) { # Parse the symbol tables regardless of whether they are normal or auxiliary symbols $RawSymbolTable[$i] = New-Object COFF.SYMBOL_TABLE($BinaryReader) if ($RawSymbolTable[$i].NumberOfAuxSymbols -eq 0) { # This symbol table entry has no auxiliary symbols $NumberofRegularSymbols++ } elseif ($RawSymbolTable[$i].Name -eq '.file') { $TempPosition = $FileStream.Position # Save filestream position # Retrieve the file name $RawSymbolTable[$i].AuxSymbols = [Text.Encoding]::UTF8.GetString($BinaryReader.ReadBytes($RawSymbolTable[$i].NumberOfAuxSymbols * $SizeofSymbolTableEntry)).TrimEnd(([Char] 0)) $FileStream.Seek($TempPosition, 'Begin') | Out-Null # Restore filestream position } elseif ($SectionHeaderNames.Contains($RawSymbolTable[$i].Name)) { $TempPosition = $FileStream.Position # Save filestream position $RawSymbolTable[$i].AuxSymbols = New-Object COFF.SECTION_DEFINITION($BinaryReader) $FileStream.Seek($TempPosition, 'Begin') | Out-Null # Restore filestream position } } # Create an array of symbol table entries without auxiliary table entries $SymbolTable = New-Object COFF.SYMBOL_TABLE[]($NumberofRegularSymbols) $j = 0 for ($i = 0; $i -lt $CoffHeader.NumberOfSymbols; $i++) { $SymbolTable[$j] = $RawSymbolTable[$i] # FYI, the first symbol table entry will never be an aux symbol $j++ # Skip over the auxiliary symbols if ($RawSymbolTable[$i].NumberOfAuxSymbols -ne 0) { $i += $RawSymbolTable[$i].NumberOfAuxSymbols } } # Dispose the binaryreader and filestream objects Dispose-Objects # Fix the section names if any of them point to the COFF string table for ($i = 0; $i -lt $CoffHeader.NumberOfSections; $i++) { if ($SectionHeaders[$i].Name.IndexOf('/') -eq 0) { $StringTableIndex = $SectionHeaders[$i].Name.SubString(1) if ($StringTableIndex -match '^[1-9][0-9]*$') { $StringTableIndex = ([Int] $StringTableIndex) - 4 if ($StringTableIndex -gt ($StringTableLength + 4)) { Write-Error 'String table entry exceeds the bounds of the object file.' } $Length = $StringTable.IndexOf(([Char] 0), $StringTableIndex) $SectionHeaders[$i].Name = $StringTable.Substring($StringTableIndex, $Length) } } } # Fix the symbol table names for ($i = 0; $i -lt $SymbolTable.Length; $i++) { if ($SymbolTable[$i].Name.IndexOf('/') -eq 0) { $StringTableIndex = $SymbolTable[$i].Name.SubString(1) if ($StringTableIndex -match '^[1-9][0-9]*$') { $StringTableIndex = ([Int] $StringTableIndex) - 4 $Length = $StringTable.IndexOf(([Char] 0), $StringTableIndex) - $StringTableIndex $SymbolTable[$i].Name = $StringTable.Substring($StringTableIndex, $Length) } } } # Apply symbol names to the relocation entries $SectionHeaders | Where-Object { $_.Relocations } | % { $_.Relocations | % { $_.Name = $RawSymbolTable[$_.SymbolTableIndex].Name } } $Result = @{ COFFHeader = $CoffHeader SectionHeaders = $SectionHeaders SymbolTable = $SymbolTable } $ParsedObjectFile = New-Object PSObject -Property $Result $ParsedObjectFile.PSObject.TypeNames[0] = 'COFF.OBJECT_FILE' Write-Output $ParsedObjectFile } } END {} } |