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pefile.py
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# -*- coding: utf-8 -*-
"""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) 2005-2011 Ero Carrera <[email protected]>
All rights reserved.
For detailed copyright information see the file COPYING in
the root of the distribution archive.
"""
import os
import struct
import time
import math
import re
import exceptions
import string
import array
import mmap
import random
import register_operation
import hashlib
sha1 = hashlib.sha1
sha256 = hashlib.sha256
sha512 = hashlib.sha512
md5 = hashlib.md5
fast_load = False
# This will set a maximum length of a string to be retrieved from the file.
# It's there to prevent loading massive amounts of data from memory mapped
# files. Strings longer than 1MB should be rather rare.
MAX_STRING_LENGTH = 0x100000 # 2^20
IMAGE_DOS_SIGNATURE = 0x5A4D
IMAGE_DOSZM_SIGNATURE = 0x4D5A
IMAGE_NE_SIGNATURE = 0x454E
IMAGE_LE_SIGNATURE = 0x454C
IMAGE_LX_SIGNATURE = 0x584C
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])
# Initialize the dictionary with all the name->value pairs
SUBLANG = dict( sublang )
# Now add all the value->name information, handling duplicates appropriately
for sublang_name, sublang_value in sublang:
if SUBLANG.has_key( sublang_value ):
SUBLANG[ sublang_value ].append( sublang_name )
else:
SUBLANG[ sublang_value ] = [ sublang_name ]
# Resolve a sublang name given the main lang name
#
def get_sublang_name_for_lang( lang_value, sublang_value ):
lang_name = LANG.get(lang_value, '*unknown*')
for sublang_name in SUBLANG.get(sublang_value, list()):
# if the main language is a substring of sublang's name, then
# return that
if lang_name in sublang_name:
return sublang_name
# otherwise return the first sublang name
return SUBLANG.get(sublang_value, ['*unknown*'])[0]
def extend_size_alignment(size, alignment):
if size % alignment:
return int(alignment * math.ceil(float(size)/float(alignment)))
else:
return size
def extend_to_size(data, size):
return data + "\x00"*(size - len(data))
def random_string(_min, _max):
s = ""
for _ in xrange(random.randint(_min, _max)):
s += random.choice( string.ascii_lowercase )
return s
def data_replace(data, offset, new_data):
return data[:offset] + new_data + data[offset+len(new_data):]
# Ange Albertini's code to process resources' strings
#
def parse_strings(data, counter, l):
i = 0
error_count = 0
while i < len(data):
data_slice = data[i:i + 2]
if len(data_slice) < 2:
break
len_ = struct.unpack("<h", data_slice)[0]
i += 2
if len_ != 0 and 0 <= len_*2 <= len(data):
try:
l[counter] = data[i: i + len_ * 2].decode('utf-16')
except UnicodeDecodeError:
error_count += 1
pass
if error_count >= 3:
break
i += len_ * 2
counter += 1
def retrieve_flags(flag_dict, flag_filter):
"""Read the flags from a dictionary and return them in a usable form.
Will return a list of (flag, value) for all flags in "flag_dict"
matching the filter "flag_filter".
"""
return [(f[0], f[1]) for f in flag_dict.items() if
isinstance(f[0], str) and f[0].startswith(flag_filter)]
def set_flags(obj, flag_field, flags):
"""Will process the flags and set attributes in the object accordingly.
The object "obj" will gain attributes named after the flags provided in
"flags" and valued True/False, matching the results of applying each
flag value from "flags" to flag_field.
"""
for flag in flags:
if flag[1] & flag_field:
#setattr(obj, flag[0], True)
obj.__dict__[flag[0]] = True
else:
#setattr(obj, flag[0], False)
obj.__dict__[flag[0]] = False
# According to http://corkami.blogspot.com/2010/01/parce-que-la-planche-aura-brule.html
# if PointerToRawData is less that 0x200 it's rounded to zero. Loading the test file
# in a debugger it's easy to verify that the PointerToRawData value of 1 is rounded
# to zero. Hence we reproduce the behabior
#
# According to the document:
# [ Microsoft Portable Executable and Common Object File Format Specification ]
# "The alignment factor (in bytes) that is used to align the raw data of sections in
# the image file. The value should be a power of 2 between 512 and 64 K, inclusive.
# The default is 512. If the SectionAlignment is less than the architecture’s page
# size, then FileAlignment must match SectionAlignment."
#
def adjust_FileAlignment( val, file_aligment ):
#if file_aligment and val % file_aligment:
# return file_aligment * ( val / file_aligment )
return val
# According to the document:
# [ Microsoft Portable Executable and Common Object File Format Specification ]
# "The alignment (in bytes) of sections when they are loaded into memory. It must be
# greater than or equal to FileAlignment. The default is the page size for the
# architecture."
#
def adjust_SectionAlignment( val, section_alignment, file_aligment ):
if section_alignment < 0x1000: # page size
section_alignment = file_aligment
# 0x200 is the minimum valid FileAlignment according to the documentation
# although ntoskrnl.exe has an alignment of 0x80 in some Windows versions
#
#elif section_alignment < 0x80:
# section_alignment = 0x80
if section_alignment and val % section_alignment:
return section_alignment * ( val / section_alignment )
return val
class UnicodeStringWrapperPostProcessor:
"""This class attempts 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
decision 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 = list()
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):
try:
txt = str(txt)
except UnicodeEncodeError:
s = []
for c in txt:
try:
s.append(str(c))
except UnicodeEncodeError:
s.append(repr(c))
txt = ''.join(s)
self.text.append( ' '*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.append( '\n' )
def get_text(self):
"""Get the text in its current state."""
return ''.join( self.text )
STRUCT_SIZEOF_TYPES = {
'x': 1, 'c': 1, 'b': 1, 'B': 1,
'h': 2, 'H': 2,
'i': 4, 'I': 4, 'l': 4, 'L': 4, 'f': 4,
'q': 8, 'Q': 8, 'd': 8,
's': 1 }
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.__field_offsets__ = dict()
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_field_absolute_offset(self, field_name):
"""Return the offset within the field for the requested field in the structure."""
return self.__file_offset__ + self.__field_offsets__[field_name]
def get_field_relative_offset(self, field_name):
"""Return the offset within the structure for the requested field."""
return self.__field_offsets__[field_name]
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 sizeof_type(self, t):
count = 1
_t = t
if t[0] in string.digits:
# extract the count
count = int( ''.join([d for d in t if d in string.digits]) )
_t = ''.join([d for d in t if d not in string.digits])
return STRUCT_SIZEOF_TYPES[_t] * count
def __set_format__(self, format):
offset = 0
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)
self.__field_offsets__[elm_name] = offset
offset += self.sizeof_type(elm_type)
# 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('0x%-8X 0x%-3X %-30s %s' % (
self.__field_offsets__[key] + self.__file_offset__,
self.__field_offsets__[key], key+':', val_str))
return dump
class SectionStructure(Structure):
"""Convenience section handling class."""
def __init__(self, *argl, **argd):
if 'pe' in argd:
self.pe = argd['pe']
del argd['pe']
Structure.__init__(self, *argl, **argd)
def get_data(self, start=None, 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.
"""
PointerToRawData_adj = adjust_FileAlignment( self.PointerToRawData,
self.pe.OPTIONAL_HEADER.FileAlignment )
VirtualAddress_adj = adjust_SectionAlignment( self.VirtualAddress,
self.pe.OPTIONAL_HEADER.SectionAlignment, self.pe.OPTIONAL_HEADER.FileAlignment )
if start is None:
offset = PointerToRawData_adj
else:
offset = ( start - VirtualAddress_adj ) + PointerToRawData_adj
if length is not None:
end = offset + length
else:
end = offset + self.SizeOfRawData