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pefile.py
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pefile.py
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# -*- coding: Latin-1 -*-
"""pefile, Portable Executable reader module
All the PE file basic structures are available with their default names
as attributes of the instance returned.
Processed elements such as the import table are made available with lowercase
names, to differentiate them from the upper case basic structure names.
pefile has been tested against the limits of valid PE headers, that is, malware.
Lots of packed malware attempt to abuse the format way beyond its standard use.
To the best of my knowledge most of the abuses are handled gracefully.
Copyright (c) 2005, 2006, 2007, 2008 Ero Carrera <ero@dkbza.org>
All rights reserved.
For detailed copyright information see the file COPYING in
the root of the distribution archive.
"""
__author__ = 'Ero Carrera'
__version__ = '1.2.9.1'
__contact__ = 'ero@dkbza.org'
import os
import struct
import time
import math
import re
import exceptions
import string
import array
sha1, sha256, sha512, md5 = None, None, None, None
try:
import hashlib
sha1 = hashlib.sha1
sha256 = hashlib.sha256
sha512 = hashlib.sha512
md5 = hashlib.md5
except ImportError:
try:
import sha
sha1 = sha.new
except ImportError:
pass
try:
import md5
md5 = md5.new
except ImportError:
pass
fast_load = False
IMAGE_DOS_SIGNATURE = 0x5A4D
IMAGE_OS2_SIGNATURE = 0x454E
IMAGE_OS2_SIGNATURE_LE = 0x454C
IMAGE_VXD_SIGNATURE = 0x454C
IMAGE_NT_SIGNATURE = 0x00004550
IMAGE_NUMBEROF_DIRECTORY_ENTRIES= 16
IMAGE_ORDINAL_FLAG = 0x80000000L
IMAGE_ORDINAL_FLAG64 = 0x8000000000000000L
OPTIONAL_HEADER_MAGIC_PE = 0x10b
OPTIONAL_HEADER_MAGIC_PE_PLUS = 0x20b
directory_entry_types = [
('IMAGE_DIRECTORY_ENTRY_EXPORT', 0),
('IMAGE_DIRECTORY_ENTRY_IMPORT', 1),
('IMAGE_DIRECTORY_ENTRY_RESOURCE', 2),
('IMAGE_DIRECTORY_ENTRY_EXCEPTION', 3),
('IMAGE_DIRECTORY_ENTRY_SECURITY', 4),
('IMAGE_DIRECTORY_ENTRY_BASERELOC', 5),
('IMAGE_DIRECTORY_ENTRY_DEBUG', 6),
('IMAGE_DIRECTORY_ENTRY_COPYRIGHT', 7),
('IMAGE_DIRECTORY_ENTRY_GLOBALPTR', 8),
('IMAGE_DIRECTORY_ENTRY_TLS', 9),
('IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG', 10),
('IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT', 11),
('IMAGE_DIRECTORY_ENTRY_IAT', 12),
('IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT', 13),
('IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR',14),
('IMAGE_DIRECTORY_ENTRY_RESERVED', 15) ]
DIRECTORY_ENTRY = dict([(e[1], e[0]) for e in directory_entry_types]+directory_entry_types)
image_characteristics = [
('IMAGE_FILE_RELOCS_STRIPPED', 0x0001),
('IMAGE_FILE_EXECUTABLE_IMAGE', 0x0002),
('IMAGE_FILE_LINE_NUMS_STRIPPED', 0x0004),
('IMAGE_FILE_LOCAL_SYMS_STRIPPED', 0x0008),
('IMAGE_FILE_AGGRESIVE_WS_TRIM', 0x0010),
('IMAGE_FILE_LARGE_ADDRESS_AWARE', 0x0020),
('IMAGE_FILE_16BIT_MACHINE', 0x0040),
('IMAGE_FILE_BYTES_REVERSED_LO', 0x0080),
('IMAGE_FILE_32BIT_MACHINE', 0x0100),
('IMAGE_FILE_DEBUG_STRIPPED', 0x0200),
('IMAGE_FILE_REMOVABLE_RUN_FROM_SWAP', 0x0400),
('IMAGE_FILE_NET_RUN_FROM_SWAP', 0x0800),
('IMAGE_FILE_SYSTEM', 0x1000),
('IMAGE_FILE_DLL', 0x2000),
('IMAGE_FILE_UP_SYSTEM_ONLY', 0x4000),
('IMAGE_FILE_BYTES_REVERSED_HI', 0x8000) ]
IMAGE_CHARACTERISTICS = dict([(e[1], e[0]) for e in
image_characteristics]+image_characteristics)
section_characteristics = [
('IMAGE_SCN_CNT_CODE', 0x00000020),
('IMAGE_SCN_CNT_INITIALIZED_DATA', 0x00000040),
('IMAGE_SCN_CNT_UNINITIALIZED_DATA', 0x00000080),
('IMAGE_SCN_LNK_OTHER', 0x00000100),
('IMAGE_SCN_LNK_INFO', 0x00000200),
('IMAGE_SCN_LNK_REMOVE', 0x00000800),
('IMAGE_SCN_LNK_COMDAT', 0x00001000),
('IMAGE_SCN_MEM_FARDATA', 0x00008000),
('IMAGE_SCN_MEM_PURGEABLE', 0x00020000),
('IMAGE_SCN_MEM_16BIT', 0x00020000),
('IMAGE_SCN_MEM_LOCKED', 0x00040000),
('IMAGE_SCN_MEM_PRELOAD', 0x00080000),
('IMAGE_SCN_ALIGN_1BYTES', 0x00100000),
('IMAGE_SCN_ALIGN_2BYTES', 0x00200000),
('IMAGE_SCN_ALIGN_4BYTES', 0x00300000),
('IMAGE_SCN_ALIGN_8BYTES', 0x00400000),
('IMAGE_SCN_ALIGN_16BYTES', 0x00500000),
('IMAGE_SCN_ALIGN_32BYTES', 0x00600000),
('IMAGE_SCN_ALIGN_64BYTES', 0x00700000),
('IMAGE_SCN_ALIGN_128BYTES', 0x00800000),
('IMAGE_SCN_ALIGN_256BYTES', 0x00900000),
('IMAGE_SCN_ALIGN_512BYTES', 0x00A00000),
('IMAGE_SCN_ALIGN_1024BYTES', 0x00B00000),
('IMAGE_SCN_ALIGN_2048BYTES', 0x00C00000),
('IMAGE_SCN_ALIGN_4096BYTES', 0x00D00000),
('IMAGE_SCN_ALIGN_8192BYTES', 0x00E00000),
('IMAGE_SCN_ALIGN_MASK', 0x00F00000),
('IMAGE_SCN_LNK_NRELOC_OVFL', 0x01000000),
('IMAGE_SCN_MEM_DISCARDABLE', 0x02000000),
('IMAGE_SCN_MEM_NOT_CACHED', 0x04000000),
('IMAGE_SCN_MEM_NOT_PAGED', 0x08000000),
('IMAGE_SCN_MEM_SHARED', 0x10000000),
('IMAGE_SCN_MEM_EXECUTE', 0x20000000),
('IMAGE_SCN_MEM_READ', 0x40000000),
('IMAGE_SCN_MEM_WRITE', 0x80000000L) ]
SECTION_CHARACTERISTICS = dict([(e[1], e[0]) for e in
section_characteristics]+section_characteristics)
debug_types = [
('IMAGE_DEBUG_TYPE_UNKNOWN', 0),
('IMAGE_DEBUG_TYPE_COFF', 1),
('IMAGE_DEBUG_TYPE_CODEVIEW', 2),
('IMAGE_DEBUG_TYPE_FPO', 3),
('IMAGE_DEBUG_TYPE_MISC', 4),
('IMAGE_DEBUG_TYPE_EXCEPTION', 5),
('IMAGE_DEBUG_TYPE_FIXUP', 6),
('IMAGE_DEBUG_TYPE_OMAP_TO_SRC', 7),
('IMAGE_DEBUG_TYPE_OMAP_FROM_SRC', 8),
('IMAGE_DEBUG_TYPE_BORLAND', 9),
('IMAGE_DEBUG_TYPE_RESERVED10', 10) ]
DEBUG_TYPE = dict([(e[1], e[0]) for e in debug_types]+debug_types)
subsystem_types = [
('IMAGE_SUBSYSTEM_UNKNOWN', 0),
('IMAGE_SUBSYSTEM_NATIVE', 1),
('IMAGE_SUBSYSTEM_WINDOWS_GUI', 2),
('IMAGE_SUBSYSTEM_WINDOWS_CUI', 3),
('IMAGE_SUBSYSTEM_OS2_CUI', 5),
('IMAGE_SUBSYSTEM_POSIX_CUI', 7),
('IMAGE_SUBSYSTEM_WINDOWS_CE_GUI', 9),
('IMAGE_SUBSYSTEM_EFI_APPLICATION', 10),
('IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER', 11),
('IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER', 12),
('IMAGE_SUBSYSTEM_EFI_ROM', 13),
('IMAGE_SUBSYSTEM_XBOX', 14)]
SUBSYSTEM_TYPE = dict([(e[1], e[0]) for e in subsystem_types]+subsystem_types)
machine_types = [
('IMAGE_FILE_MACHINE_UNKNOWN', 0),
('IMAGE_FILE_MACHINE_AM33', 0x1d3),
('IMAGE_FILE_MACHINE_AMD64', 0x8664),
('IMAGE_FILE_MACHINE_ARM', 0x1c0),
('IMAGE_FILE_MACHINE_EBC', 0xebc),
('IMAGE_FILE_MACHINE_I386', 0x14c),
('IMAGE_FILE_MACHINE_IA64', 0x200),
('IMAGE_FILE_MACHINE_MR32', 0x9041),
('IMAGE_FILE_MACHINE_MIPS16', 0x266),
('IMAGE_FILE_MACHINE_MIPSFPU', 0x366),
('IMAGE_FILE_MACHINE_MIPSFPU16',0x466),
('IMAGE_FILE_MACHINE_POWERPC', 0x1f0),
('IMAGE_FILE_MACHINE_POWERPCFP',0x1f1),
('IMAGE_FILE_MACHINE_R4000', 0x166),
('IMAGE_FILE_MACHINE_SH3', 0x1a2),
('IMAGE_FILE_MACHINE_SH3DSP', 0x1a3),
('IMAGE_FILE_MACHINE_SH4', 0x1a6),
('IMAGE_FILE_MACHINE_SH5', 0x1a8),
('IMAGE_FILE_MACHINE_THUMB', 0x1c2),
('IMAGE_FILE_MACHINE_WCEMIPSV2',0x169),
]
MACHINE_TYPE = dict([(e[1], e[0]) for e in machine_types]+machine_types)
relocation_types = [
('IMAGE_REL_BASED_ABSOLUTE', 0),
('IMAGE_REL_BASED_HIGH', 1),
('IMAGE_REL_BASED_LOW', 2),
('IMAGE_REL_BASED_HIGHLOW', 3),
('IMAGE_REL_BASED_HIGHADJ', 4),
('IMAGE_REL_BASED_MIPS_JMPADDR', 5),
('IMAGE_REL_BASED_SECTION', 6),
('IMAGE_REL_BASED_REL', 7),
('IMAGE_REL_BASED_MIPS_JMPADDR16', 9),
('IMAGE_REL_BASED_IA64_IMM64', 9),
('IMAGE_REL_BASED_DIR64', 10),
('IMAGE_REL_BASED_HIGH3ADJ', 11) ]
RELOCATION_TYPE = dict([(e[1], e[0]) for e in relocation_types]+relocation_types)
dll_characteristics = [
('IMAGE_DLL_CHARACTERISTICS_RESERVED_0x0001', 0x0001),
('IMAGE_DLL_CHARACTERISTICS_RESERVED_0x0002', 0x0002),
('IMAGE_DLL_CHARACTERISTICS_RESERVED_0x0004', 0x0004),
('IMAGE_DLL_CHARACTERISTICS_RESERVED_0x0008', 0x0008),
('IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE', 0x0040),
('IMAGE_DLL_CHARACTERISTICS_FORCE_INTEGRITY', 0x0080),
('IMAGE_DLL_CHARACTERISTICS_NX_COMPAT', 0x0100),
('IMAGE_DLL_CHARACTERISTICS_NO_ISOLATION', 0x0200),
('IMAGE_DLL_CHARACTERISTICS_NO_SEH', 0x0400),
('IMAGE_DLL_CHARACTERISTICS_NO_BIND', 0x0800),
('IMAGE_DLL_CHARACTERISTICS_RESERVED_0x1000', 0x1000),
('IMAGE_DLL_CHARACTERISTICS_WDM_DRIVER', 0x2000),
('IMAGE_DLL_CHARACTERISTICS_TERMINAL_SERVER_AWARE', 0x8000) ]
DLL_CHARACTERISTICS = dict([(e[1], e[0]) for e in dll_characteristics]+dll_characteristics)
# Resource types
resource_type = [
('RT_CURSOR', 1),
('RT_BITMAP', 2),
('RT_ICON', 3),
('RT_MENU', 4),
('RT_DIALOG', 5),
('RT_STRING', 6),
('RT_FONTDIR', 7),
('RT_FONT', 8),
('RT_ACCELERATOR', 9),
('RT_RCDATA', 10),
('RT_MESSAGETABLE', 11),
('RT_GROUP_CURSOR', 12),
('RT_GROUP_ICON', 14),
('RT_VERSION', 16),
('RT_DLGINCLUDE', 17),
('RT_PLUGPLAY', 19),
('RT_VXD', 20),
('RT_ANICURSOR', 21),
('RT_ANIICON', 22),
('RT_HTML', 23),
('RT_MANIFEST', 24) ]
RESOURCE_TYPE = dict([(e[1], e[0]) for e in resource_type]+resource_type)
# Language definitions
lang = [
('LANG_NEUTRAL', 0x00),
('LANG_INVARIANT', 0x7f),
('LANG_AFRIKAANS', 0x36),
('LANG_ALBANIAN', 0x1c),
('LANG_ARABIC', 0x01),
('LANG_ARMENIAN', 0x2b),
('LANG_ASSAMESE', 0x4d),
('LANG_AZERI', 0x2c),
('LANG_BASQUE', 0x2d),
('LANG_BELARUSIAN', 0x23),
('LANG_BENGALI', 0x45),
('LANG_BULGARIAN', 0x02),
('LANG_CATALAN', 0x03),
('LANG_CHINESE', 0x04),
('LANG_CROATIAN', 0x1a),
('LANG_CZECH', 0x05),
('LANG_DANISH', 0x06),
('LANG_DIVEHI', 0x65),
('LANG_DUTCH', 0x13),
('LANG_ENGLISH', 0x09),
('LANG_ESTONIAN', 0x25),
('LANG_FAEROESE', 0x38),
('LANG_FARSI', 0x29),
('LANG_FINNISH', 0x0b),
('LANG_FRENCH', 0x0c),
('LANG_GALICIAN', 0x56),
('LANG_GEORGIAN', 0x37),
('LANG_GERMAN', 0x07),
('LANG_GREEK', 0x08),
('LANG_GUJARATI', 0x47),
('LANG_HEBREW', 0x0d),
('LANG_HINDI', 0x39),
('LANG_HUNGARIAN', 0x0e),
('LANG_ICELANDIC', 0x0f),
('LANG_INDONESIAN', 0x21),
('LANG_ITALIAN', 0x10),
('LANG_JAPANESE', 0x11),
('LANG_KANNADA', 0x4b),
('LANG_KASHMIRI', 0x60),
('LANG_KAZAK', 0x3f),
('LANG_KONKANI', 0x57),
('LANG_KOREAN', 0x12),
('LANG_KYRGYZ', 0x40),
('LANG_LATVIAN', 0x26),
('LANG_LITHUANIAN', 0x27),
('LANG_MACEDONIAN', 0x2f),
('LANG_MALAY', 0x3e),
('LANG_MALAYALAM', 0x4c),
('LANG_MANIPURI', 0x58),
('LANG_MARATHI', 0x4e),
('LANG_MONGOLIAN', 0x50),
('LANG_NEPALI', 0x61),
('LANG_NORWEGIAN', 0x14),
('LANG_ORIYA', 0x48),
('LANG_POLISH', 0x15),
('LANG_PORTUGUESE', 0x16),
('LANG_PUNJABI', 0x46),
('LANG_ROMANIAN', 0x18),
('LANG_RUSSIAN', 0x19),
('LANG_SANSKRIT', 0x4f),
('LANG_SERBIAN', 0x1a),
('LANG_SINDHI', 0x59),
('LANG_SLOVAK', 0x1b),
('LANG_SLOVENIAN', 0x24),
('LANG_SPANISH', 0x0a),
('LANG_SWAHILI', 0x41),
('LANG_SWEDISH', 0x1d),
('LANG_SYRIAC', 0x5a),
('LANG_TAMIL', 0x49),
('LANG_TATAR', 0x44),
('LANG_TELUGU', 0x4a),
('LANG_THAI', 0x1e),
('LANG_TURKISH', 0x1f),
('LANG_UKRAINIAN', 0x22),
('LANG_URDU', 0x20),
('LANG_UZBEK', 0x43),
('LANG_VIETNAMESE', 0x2a),
('LANG_GAELIC', 0x3c),
('LANG_MALTESE', 0x3a),
('LANG_MAORI', 0x28),
('LANG_RHAETO_ROMANCE',0x17),
('LANG_SAAMI', 0x3b),
('LANG_SORBIAN', 0x2e),
('LANG_SUTU', 0x30),
('LANG_TSONGA', 0x31),
('LANG_TSWANA', 0x32),
('LANG_VENDA', 0x33),
('LANG_XHOSA', 0x34),
('LANG_ZULU', 0x35),
('LANG_ESPERANTO', 0x8f),
('LANG_WALON', 0x90),
('LANG_CORNISH', 0x91),
('LANG_WELSH', 0x92),
('LANG_BRETON', 0x93) ]
LANG = dict(lang+[(e[1], e[0]) for e in lang])
# Sublanguage definitions
sublang = [
('SUBLANG_NEUTRAL', 0x00),
('SUBLANG_DEFAULT', 0x01),
('SUBLANG_SYS_DEFAULT', 0x02),
('SUBLANG_ARABIC_SAUDI_ARABIA', 0x01),
('SUBLANG_ARABIC_IRAQ', 0x02),
('SUBLANG_ARABIC_EGYPT', 0x03),
('SUBLANG_ARABIC_LIBYA', 0x04),
('SUBLANG_ARABIC_ALGERIA', 0x05),
('SUBLANG_ARABIC_MOROCCO', 0x06),
('SUBLANG_ARABIC_TUNISIA', 0x07),
('SUBLANG_ARABIC_OMAN', 0x08),
('SUBLANG_ARABIC_YEMEN', 0x09),
('SUBLANG_ARABIC_SYRIA', 0x0a),
('SUBLANG_ARABIC_JORDAN', 0x0b),
('SUBLANG_ARABIC_LEBANON', 0x0c),
('SUBLANG_ARABIC_KUWAIT', 0x0d),
('SUBLANG_ARABIC_UAE', 0x0e),
('SUBLANG_ARABIC_BAHRAIN', 0x0f),
('SUBLANG_ARABIC_QATAR', 0x10),
('SUBLANG_AZERI_LATIN', 0x01),
('SUBLANG_AZERI_CYRILLIC', 0x02),
('SUBLANG_CHINESE_TRADITIONAL', 0x01),
('SUBLANG_CHINESE_SIMPLIFIED', 0x02),
('SUBLANG_CHINESE_HONGKONG', 0x03),
('SUBLANG_CHINESE_SINGAPORE', 0x04),
('SUBLANG_CHINESE_MACAU', 0x05),
('SUBLANG_DUTCH', 0x01),
('SUBLANG_DUTCH_BELGIAN', 0x02),
('SUBLANG_ENGLISH_US', 0x01),
('SUBLANG_ENGLISH_UK', 0x02),
('SUBLANG_ENGLISH_AUS', 0x03),
('SUBLANG_ENGLISH_CAN', 0x04),
('SUBLANG_ENGLISH_NZ', 0x05),
('SUBLANG_ENGLISH_EIRE', 0x06),
('SUBLANG_ENGLISH_SOUTH_AFRICA', 0x07),
('SUBLANG_ENGLISH_JAMAICA', 0x08),
('SUBLANG_ENGLISH_CARIBBEAN', 0x09),
('SUBLANG_ENGLISH_BELIZE', 0x0a),
('SUBLANG_ENGLISH_TRINIDAD', 0x0b),
('SUBLANG_ENGLISH_ZIMBABWE', 0x0c),
('SUBLANG_ENGLISH_PHILIPPINES', 0x0d),
('SUBLANG_FRENCH', 0x01),
('SUBLANG_FRENCH_BELGIAN', 0x02),
('SUBLANG_FRENCH_CANADIAN', 0x03),
('SUBLANG_FRENCH_SWISS', 0x04),
('SUBLANG_FRENCH_LUXEMBOURG', 0x05),
('SUBLANG_FRENCH_MONACO', 0x06),
('SUBLANG_GERMAN', 0x01),
('SUBLANG_GERMAN_SWISS', 0x02),
('SUBLANG_GERMAN_AUSTRIAN', 0x03),
('SUBLANG_GERMAN_LUXEMBOURG', 0x04),
('SUBLANG_GERMAN_LIECHTENSTEIN', 0x05),
('SUBLANG_ITALIAN', 0x01),
('SUBLANG_ITALIAN_SWISS', 0x02),
('SUBLANG_KASHMIRI_SASIA', 0x02),
('SUBLANG_KASHMIRI_INDIA', 0x02),
('SUBLANG_KOREAN', 0x01),
('SUBLANG_LITHUANIAN', 0x01),
('SUBLANG_MALAY_MALAYSIA', 0x01),
('SUBLANG_MALAY_BRUNEI_DARUSSALAM', 0x02),
('SUBLANG_NEPALI_INDIA', 0x02),
('SUBLANG_NORWEGIAN_BOKMAL', 0x01),
('SUBLANG_NORWEGIAN_NYNORSK', 0x02),
('SUBLANG_PORTUGUESE', 0x02),
('SUBLANG_PORTUGUESE_BRAZILIAN', 0x01),
('SUBLANG_SERBIAN_LATIN', 0x02),
('SUBLANG_SERBIAN_CYRILLIC', 0x03),
('SUBLANG_SPANISH', 0x01),
('SUBLANG_SPANISH_MEXICAN', 0x02),
('SUBLANG_SPANISH_MODERN', 0x03),
('SUBLANG_SPANISH_GUATEMALA', 0x04),
('SUBLANG_SPANISH_COSTA_RICA', 0x05),
('SUBLANG_SPANISH_PANAMA', 0x06),
('SUBLANG_SPANISH_DOMINICAN_REPUBLIC', 0x07),
('SUBLANG_SPANISH_VENEZUELA', 0x08),
('SUBLANG_SPANISH_COLOMBIA', 0x09),
('SUBLANG_SPANISH_PERU', 0x0a),
('SUBLANG_SPANISH_ARGENTINA', 0x0b),
('SUBLANG_SPANISH_ECUADOR', 0x0c),
('SUBLANG_SPANISH_CHILE', 0x0d),
('SUBLANG_SPANISH_URUGUAY', 0x0e),
('SUBLANG_SPANISH_PARAGUAY', 0x0f),
('SUBLANG_SPANISH_BOLIVIA', 0x10),
('SUBLANG_SPANISH_EL_SALVADOR', 0x11),
('SUBLANG_SPANISH_HONDURAS', 0x12),
('SUBLANG_SPANISH_NICARAGUA', 0x13),
('SUBLANG_SPANISH_PUERTO_RICO', 0x14),
('SUBLANG_SWEDISH', 0x01),
('SUBLANG_SWEDISH_FINLAND', 0x02),
('SUBLANG_URDU_PAKISTAN', 0x01),
('SUBLANG_URDU_INDIA', 0x02),
('SUBLANG_UZBEK_LATIN', 0x01),
('SUBLANG_UZBEK_CYRILLIC', 0x02),
('SUBLANG_DUTCH_SURINAM', 0x03),
('SUBLANG_ROMANIAN', 0x01),
('SUBLANG_ROMANIAN_MOLDAVIA', 0x02),
('SUBLANG_RUSSIAN', 0x01),
('SUBLANG_RUSSIAN_MOLDAVIA', 0x02),
('SUBLANG_CROATIAN', 0x01),
('SUBLANG_LITHUANIAN_CLASSIC', 0x02),
('SUBLANG_GAELIC', 0x01),
('SUBLANG_GAELIC_SCOTTISH', 0x02),
('SUBLANG_GAELIC_MANX', 0x03) ]
SUBLANG = dict(sublang+[(e[1], e[0]) for e in sublang])
class UnicodeStringWrapperPostProcessor:
"""This class attemps to help the process of identifying strings
that might be plain Unicode or Pascal. A list of strings will be
wrapped on it with the hope the overlappings will help make the
decission about their type."""
def __init__(self, pe, rva_ptr):
self.pe = pe
self.rva_ptr = rva_ptr
self.string = None
def get_rva(self):
"""Get the RVA of the string."""
return self.rva_ptr
def __str__(self):
"""Return the escaped ASCII representation of the string."""
def convert_char(char):
if char in string.printable:
return char
else:
return r'\x%02x' % ord(char)
if self.string:
return ''.join([convert_char(c) for c in self.string])
return ''
def invalidate(self):
"""Make this instance None, to express it's no known string type."""
self = None
def render_pascal_16(self):
self.string = self.pe.get_string_u_at_rva(
self.rva_ptr+2,
max_length=self.__get_pascal_16_length())
def ask_pascal_16(self, next_rva_ptr):
"""The next RVA is taken to be the one immediately following this one.
Such RVA could indicate the natural end of the string and will be checked
with the possible length contained in the first word.
"""
length = self.__get_pascal_16_length()
if length == (next_rva_ptr - (self.rva_ptr+2)) / 2:
self.length = length
return True
return False
def __get_pascal_16_length(self):
return self.__get_word_value_at_rva(self.rva_ptr)
def __get_word_value_at_rva(self, rva):
try:
data = self.pe.get_data(self.rva_ptr, 2)
except PEFormatError, e:
return False
if len(data)<2:
return False
return struct.unpack('<H', data)[0]
#def render_pascal_8(self):
# """"""
def ask_unicode_16(self, next_rva_ptr):
"""The next RVA is taken to be the one immediately following this one.
Such RVA could indicate the natural end of the string and will be checked
to see if there's a Unicode NULL character there.
"""
if self.__get_word_value_at_rva(next_rva_ptr-2) == 0:
self.length = next_rva_ptr - self.rva_ptr
return True
return False
def render_unicode_16(self):
""""""
self.string = self.pe.get_string_u_at_rva(self.rva_ptr)
class PEFormatError(Exception):
"""Generic PE format error exception."""
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
class Dump:
"""Convenience class for dumping the PE information."""
def __init__(self):
self.text = ''
def add_lines(self, txt, indent=0):
"""Adds a list of lines.
The list can be indented with the optional argument 'indent'.
"""
for line in txt:
self.add_line(line, indent)
def add_line(self, txt, indent=0):
"""Adds a line.
The line can be indented with the optional argument 'indent'.
"""
self.add(txt+'\n', indent)
def add(self, txt, indent=0):
"""Adds some text, no newline will be appended.
The text can be indented with the optional argument 'indent'.
"""
if isinstance(txt, unicode):
s = []
for c in txt:
try:
s.append(str(c))
except UnicodeEncodeError, e:
s.append(repr(c))
txt = ''.join(s)
self.text += ' '*indent+txt
def add_header(self, txt):
"""Adds a header element."""
self.add_line('-'*10+txt+'-'*10+'\n')
def add_newline(self):
"""Adds a newline."""
self.text += '\n'
def get_text(self):
"""Get the text in its current state."""
return self.text
class Structure:
"""Prepare structure object to extract members from data.
Format is a list containing definitions for the elements
of the structure.
"""
def __init__(self, format, name=None, file_offset=None):
# Format is forced little endian, for big endian non Intel platforms
self.__format__ = '<'
self.__keys__ = []
# self.values = {}
self.__format_length__ = 0
self.__set_format__(format[1])
self._all_zeroes = False
self.__unpacked_data_elms__ = None
self.__file_offset__ = file_offset
if name:
self.name = name
else:
self.name = format[0]
def __get_format__(self):
return self.__format__
def get_file_offset(self):
return self.__file_offset__
def set_file_offset(self, offset):
self.__file_offset__ = offset
def all_zeroes(self):
"""Returns true is the unpacked data is all zeroes."""
return self._all_zeroes
def __set_format__(self, format):
for elm in format:
if ',' in elm:
elm_type, elm_name = elm.split(',', 1)
self.__format__ += elm_type
elm_names = elm_name.split(',')
names = []
for elm_name in elm_names:
if elm_name in self.__keys__:
search_list = [x[:len(elm_name)] for x in self.__keys__]
occ_count = search_list.count(elm_name)
elm_name = elm_name+'_'+str(occ_count)
names.append(elm_name)
# Some PE header structures have unions on them, so a certain
# value might have different names, so each key has a list of
# all the possible members referring to the data.
self.__keys__.append(names)
self.__format_length__ = struct.calcsize(self.__format__)
def sizeof(self):
"""Return size of the structure."""
return self.__format_length__
def __unpack__(self, data):
if len(data)>self.__format_length__:
data = data[:self.__format_length__]
# OC Patch:
# Some malware have incorrect header lengths.
# Fail gracefully if this occurs
# Buggy malware: a29b0118af8b7408444df81701ad5a7f
#
elif len(data)<self.__format_length__:
raise PEFormatError('Data length less than expected header length.')
if data.count(chr(0)) == len(data):
self._all_zeroes = True
self.__unpacked_data_elms__ = struct.unpack(self.__format__, data)
for i in xrange(len(self.__unpacked_data_elms__)):
for key in self.__keys__[i]:
# self.values[key] = self.__unpacked_data_elms__[i]
setattr(self, key, self.__unpacked_data_elms__[i])
def __pack__(self):
new_values = []
for i in xrange(len(self.__unpacked_data_elms__)):
for key in self.__keys__[i]:
new_val = getattr(self, key)
old_val = self.__unpacked_data_elms__[i]
# In the case of Unions, when the first changed value
# is picked the loop is exited
if new_val != old_val:
break
new_values.append(new_val)
return struct.pack(self.__format__, *new_values)
def __str__(self):
return '\n'.join( self.dump() )
def __repr__(self):
return '<Structure: %s>' % (' '.join( [' '.join(s.split()) for s in self.dump()] ))
def dump(self, indentation=0):
"""Returns a string representation of the structure."""
dump = []
dump.append('[%s]' % self.name)
# Refer to the __set_format__ method for an explanation
# of the following construct.
for keys in self.__keys__:
for key in keys:
val = getattr(self, key)
if isinstance(val, int) or isinstance(val, long):
val_str = '0x%-8X' % (val)
if key == 'TimeDateStamp' or key == 'dwTimeStamp':
try:
val_str += ' [%s UTC]' % time.asctime(time.gmtime(val))
except exceptions.ValueError, e:
val_str += ' [INVALID TIME]'
else:
val_str = ''.join(filter(lambda c:c != '\0', str(val)))
dump.append('%-30s %s' % (key+':', val_str))
return dump
class SectionStructure(Structure):
"""Convenience section handling class."""
def get_data(self, start, length=None):
"""Get data chunk from a section.
Allows to query data from the section by passing the
addresses where the PE file would be loaded by default.
It is then possible to retrieve code and data by its real
addresses as it would be if loaded.
"""
offset = start - self.VirtualAddress
if length:
end = offset+length
else:
end = len(self.data)
return self.data[offset:end]
def get_rva_from_offset(self, offset):
return offset - self.PointerToRawData + self.VirtualAddress
def get_offset_from_rva(self, rva):
return (rva - self.VirtualAddress) + self.PointerToRawData
def contains_offset(self, offset):
"""Check whether the section contains the file offset provided."""
if not self.PointerToRawData:
# bss and other sections containing only uninitialized data must have 0
# and do not take space in the file
return False
return self.PointerToRawData <= offset < self.VirtualAddress + self.SizeOfRawData
def contains_rva(self, rva):
"""Check whether the section contains the address provided."""
# PECOFF documentation v8 says:
# The total size of the section when loaded into memory.
# If this value is greater than SizeOfRawData, the section is zero-padded.
# This field is valid only for executable images and should be set to zero
# for object files.
if len(self.data) < self.SizeOfRawData:
size = self.Misc_VirtualSize
else:
size = max(self.SizeOfRawData, self.Misc_VirtualSize)
return self.VirtualAddress <= rva < self.VirtualAddress + size
def contains(self, rva):
#print "DEPRECATION WARNING: you should use contains_rva() instead of contains()"
return self.contains_rva(rva)
def set_data(self, data):
"""Set the data belonging to the section."""
self.data = data
def get_entropy(self):
"""Calculate and return the entropy for the section."""
return self.entropy_H( self.data )
def get_hash_sha1(self):
"""Get the SHA-1 hex-digest of the section's data."""
if sha1 is not None:
return sha1( self.data ).hexdigest()
def get_hash_sha256(self):
"""Get the SHA-256 hex-digest of the section's data."""
if sha256 is not None:
return sha256( self.data ).hexdigest()
def get_hash_sha512(self):
"""Get the SHA-512 hex-digest of the section's data."""
if sha512 is not None:
return sha512( self.data ).hexdigest()
def get_hash_md5(self):
"""Get the MD5 hex-digest of the section's data."""
if md5 is not None:
return md5( self.data ).hexdigest()
def entropy_H(self, data):
"""Calculate the entropy of a chunk of data."""
if len(data) == 0:
return 0.0
occurences = array.array('L', [0]*256)
for x in data:
occurences[ord(x)] += 1
entropy = 0
for x in occurences:
if x:
p_x = float(x) / len(data)
entropy -= p_x*math.log(p_x, 2)
return entropy
class DataContainer:
"""Generic data container."""
def __init__(self, **args):
for key, value in args.items():
setattr(self, key, value)
class ImportDescData(DataContainer):
"""Holds import descriptor information.
dll: name of the imported DLL
imports: list of imported symbols (ImportData instances)
struct: IMAGE_IMPORT_DESCRIPTOR sctruture
"""
class ImportData(DataContainer):
"""Holds imported symbol's information.
ordinal: Ordinal of the symbol
name: Name of the symbol
bound: If the symbol is bound, this contains
the address.
"""
class ExportDirData(DataContainer):
"""Holds export directory information.
struct: IMAGE_EXPORT_DIRECTORY structure
symbols: list of exported symbols (ExportData instances)
"""
class ExportData(DataContainer):
"""Holds exported symbols' information.
ordinal: ordinal of the symbol
address: address of the symbol
name: name of the symbol (None if the symbol is
exported by ordinal only)
forwarder: if the symbol is forwarded it will
contain the name of the target symbol,
None otherwise.
"""
class ResourceDirData(DataContainer):
"""Holds resource directory information.
struct: IMAGE_RESOURCE_DIRECTORY structure
entries: list of entries (ResourceDirEntryData instances)
"""
class ResourceDirEntryData(DataContainer):
"""Holds resource directory entry data.
struct: IMAGE_RESOURCE_DIRECTORY_ENTRY structure
name: If the resource is identified by name this
attribute will contain the name string. None
otherwise. If identified by id, the id is
availabe at 'struct.Id'
id: the id, also in struct.Id
directory: If this entry has a lower level directory
this attribute will point to the
ResourceDirData instance representing it.
data: If this entry has no futher lower directories
and points to the actual resource data, this