def parse_content(self,
parse_resources=True,
parse_delay=True,
parse_reloc=True):
off = 0
self._sex = 0
self._wsize = 32
self.Doshdr = pe.Doshdr.unpack(self.content, off, self)
off = self.Doshdr.lfanew
if off > len(self.content):
log.warn('ntsig after eof!')
self.NTsig = None
return
self.NTsig = pe.NTsig.unpack(self.content, off, self)
self.DirImport = None
self.DirExport = None
self.DirDelay = None
self.DirReloc = None
self.DirRes = None
if self.NTsig.signature != 0x4550:
log.warn('not a valid pe!')
return
off += len(self.NTsig)
self.Coffhdr, length = pe.Coffhdr.unpack_l(self.content, off, self)
off += length
self._wsize = ord(self.content[off + 1]) * 32
if self._wsize == 32:
Opthdr = pe.Opthdr32
else:
Opthdr = pe.Opthdr64
if len(self.content) < 0x200:
# Fix for very little PE
self.content += (0x200 - len(self.content)) * b'\x00'
self.Opthdr, length = Opthdr.unpack_l(self.content, off, self)
self.NThdr = pe.NThdr.unpack(self.content, off + length, self)
self.img_rva[0] = self.content[:self.NThdr.sizeofheaders]
off += self.Coffhdr.sizeofoptionalheader
self.SHList = pe.SHList.unpack(self.content, off, self)
# load section data
filealignment = self.NThdr.filealignment
sectionalignment = self.NThdr.sectionalignment
for section in self.SHList.shlist:
virt_size = (section.size // sectionalignment +
1) * sectionalignment
if self.loadfrommem:
section.offset = section.addr
if self.NThdr.sectionalignment > 0x1000:
raw_off = 0x200 * (section.offset // 0x200)
else:
raw_off = section.offset
if raw_off != section.offset:
log.warn('unaligned raw section (%x %x)!', raw_off,
section.offset)
section.data = StrPatchwork()
if section.rawsize == 0:
rounded_size = 0
else:
if section.rawsize % filealignment:
rs = (section.rawsize // filealignment + 1) * filealignment
else:
rs = section.rawsize
rounded_size = rs
if rounded_size > virt_size:
rounded_size = min(rounded_size, section.size)
data = self.content[raw_off:raw_off + rounded_size]
section.data = data
# Pad data to page size 0x1000
length = len(data)
data += b"\x00" * ((((length + 0xfff)) & 0xFFFFF000) - length)
self.img_rva[section.addr] = data
# Fix img_rva
self.img_rva = self.img_rva
try:
self.DirImport = pe.DirImport.unpack(
self.img_rva,
self.NThdr.optentries[pe.DIRECTORY_ENTRY_IMPORT].rva, self)
except pe.InvalidOffset:
log.warning('cannot parse DirImport, skipping')
self.DirImport = pe.DirImport(self)
try:
self.DirExport = pe.DirExport.unpack(
self.img_rva,
self.NThdr.optentries[pe.DIRECTORY_ENTRY_EXPORT].rva, self)
except pe.InvalidOffset:
log.warning('cannot parse DirExport, skipping')
self.DirExport = pe.DirExport(self)
if len(self.NThdr.optentries) > pe.DIRECTORY_ENTRY_DELAY_IMPORT:
self.DirDelay = pe.DirDelay(self)
if parse_delay:
try:
self.DirDelay = pe.DirDelay.unpack(
self.img_rva, self.NThdr.optentries[
pe.DIRECTORY_ENTRY_DELAY_IMPORT].rva, self)
except pe.InvalidOffset:
log.warning('cannot parse DirDelay, skipping')
if len(self.NThdr.optentries) > pe.DIRECTORY_ENTRY_BASERELOC:
self.DirReloc = pe.DirReloc(self)
if parse_reloc:
try:
self.DirReloc = pe.DirReloc.unpack(
self.img_rva, self.NThdr.optentries[
pe.DIRECTORY_ENTRY_BASERELOC].rva, self)
except pe.InvalidOffset:
log.warning('cannot parse DirReloc, skipping')
if len(self.NThdr.optentries) > pe.DIRECTORY_ENTRY_RESOURCE:
self.DirRes = pe.DirRes(self)
if parse_resources:
self.DirRes = pe.DirRes(self)
try:
self.DirRes = pe.DirRes.unpack(
self.img_rva,
self.NThdr.optentries[pe.DIRECTORY_ENTRY_RESOURCE].rva,
self)
except pe.InvalidOffset:
log.warning('cannot parse DirRes, skipping')
def __init__(self,
pestr=None,
loadfrommem=False,
parse_resources=True,
parse_delay=True,
parse_reloc=True,
wsize=32):
self._rva = ContectRva(self)
self._virt = ContentVirtual(self)
self.img_rva = StrPatchwork()
if pestr is None:
self._content = StrPatchwork()
self._sex = 0
self._wsize = wsize
self.Doshdr = pe.Doshdr(self)
self.NTsig = pe.NTsig(self)
self.Coffhdr = pe.Coffhdr(self)
if self._wsize == 32:
Opthdr = pe.Opthdr32
else:
Opthdr = pe.Opthdr64
self.Opthdr = Opthdr(self)
self.NThdr = pe.NThdr(self)
self.NThdr.optentries = [pe.Optehdr(self) for _ in range(0x10)]
self.NThdr.CheckSum = 0
self.SHList = pe.SHList(self)
self.SHList.shlist = []
self.NThdr.sizeofheaders = 0x1000
self.DirImport = pe.DirImport(self)
self.DirExport = pe.DirExport(self)
self.DirDelay = pe.DirDelay(self)
self.DirReloc = pe.DirReloc(self)
self.DirRes = pe.DirRes(self)
self.Doshdr.magic = 0x5a4d
self.Doshdr.lfanew = 0xe0
self.NTsig.signature = 0x4550
if wsize == 32:
self.Opthdr.magic = 0x10b
elif wsize == 64:
self.Opthdr.magic = 0x20b
else:
raise ValueError('unknown pe size %r' % wsize)
self.Opthdr.majorlinkerversion = 0x7
self.Opthdr.minorlinkerversion = 0x0
self.NThdr.filealignment = 0x1000
self.NThdr.sectionalignment = 0x1000
self.NThdr.majoroperatingsystemversion = 0x5
self.NThdr.minoroperatingsystemversion = 0x1
self.NThdr.MajorImageVersion = 0x5
self.NThdr.MinorImageVersion = 0x1
self.NThdr.majorsubsystemversion = 0x4
self.NThdr.minorsubsystemversion = 0x0
self.NThdr.subsystem = 0x3
if wsize == 32:
self.NThdr.dllcharacteristics = 0x8000
else:
self.NThdr.dllcharacteristics = 0x8000
# for createthread
self.NThdr.sizeofstackreserve = 0x200000
self.NThdr.sizeofstackcommit = 0x1000
self.NThdr.sizeofheapreserve = 0x100000
self.NThdr.sizeofheapcommit = 0x1000
self.NThdr.ImageBase = 0x400000
self.NThdr.sizeofheaders = 0x1000
self.NThdr.numberofrvaandsizes = 0x10
self.NTsig.signature = 0x4550
if wsize == 32:
self.Coffhdr.machine = 0x14c
elif wsize == 64:
self.Coffhdr.machine = 0x8664
else:
raise ValueError('unknown pe size %r' % wsize)
if wsize == 32:
self.Coffhdr.characteristics = 0x10f
self.Coffhdr.sizeofoptionalheader = 0xe0
else:
self.Coffhdr.characteristics = 0x22 # 0x2f
self.Coffhdr.sizeofoptionalheader = 0xf0
else:
self._content = StrPatchwork(pestr)
self.loadfrommem = loadfrommem
self.parse_content(parse_resources=parse_resources,
parse_delay=parse_delay,
parse_reloc=parse_reloc)
