def platformParseBinaryPe(self, filename, baseaddr, normname):
# If we're on windows, fake out the PE header and use dbghelp
if False:
# FIXME this code is stolen and should be a function!
import ctypes
import vtrace.platforms.win32 as vt_win32
fakepe = self.readMemory(baseaddr, 1024)
tfile = tempfile.NamedTemporaryFile(delete=False)
tfilename = tfile.name
pebuf = ctypes.create_string_buffer(fakepe)
try:
try:
tfile.write(fakepe)
tfile.close()
#parser = vt_win32.Win32SymbolParser(-1, tfilename, baseaddr)
parser = vt_win32.Win32SymbolParser(
-1, None, ctypes.addressof(pebuf))
parser.parse()
parser.loadSymsIntoTrace(self, normname)
finally:
os.unlink(tfilename)
except Exception as e:
logger.warning(str(e))
else:
pe = PE.peFromMemoryObject(self, baseaddr)
for rva, ord, name in pe.getExports():
self.addSymbol(
e_resolv.Symbol(name, baseaddr + rva, 0, normname))
def platformParseBinaryPe(self, filename, baseaddr, normname):
# If we're on windows, fake out the PE header and use dbghelp
#if platform.system() in ['Microsoft', 'Windows']:
if False:
# FIXME this code is stolen and should be a function!
import vtrace.platforms.win32 as vt_win32
fakepe = self.readMemory(baseaddr, 1024)
tfile = tempfile.NamedTemporaryFile(delete=False)
tfilename = tfile.name
import ctypes
pebuf = ctypes.create_string_buffer(fakepe)
try:
try:
tfile.write(fakepe)
tfile.close()
#parser = vt_win32.Win32SymbolParser(-1, tfilename, baseaddr)
parser = vt_win32.Win32SymbolParser(
-1, None, ctypes.addressof(pebuf))
parser.parse()
parser.loadSymsIntoTrace(self, normname)
finally:
os.unlink(tfilename)
except Exception, e:
print e
def main(argv):
opts = setup().parse_args(argv)
with open(opts.file, 'rb') as f:
p = PE.PE(f)
baseaddr = p.IMAGE_NT_HEADERS.OptionalHeader.ImageBase
osmajor = p.IMAGE_NT_HEADERS.OptionalHeader.MajorOperatingSystemVersion
osminor = p.IMAGE_NT_HEADERS.OptionalHeader.MinorOperatingSystemVersion
machine = p.IMAGE_NT_HEADERS.FileHeader.Machine
vsver = p.getVS_VERSIONINFO()
archname = PE.machine_names.get(machine)
parser = vt_win32.Win32SymbolParser(0xffffffff, opts.file, baseaddr)
parser.parse()
t = parser._sym_types.values()
e = parser._sym_enums.values()
builder = vs_builder.VStructBuilder(defs=t, enums=e)
print('# Version: %d.%d' % (osmajor, osminor))
print('# Architecture: %s' % archname)
if vsver is not None:
keys = vsver.getVersionKeys()
keys.sort()
for k in keys:
val = vsver.getVersionValue(k)
print('# %s: %s' % (k, val))
print(builder.genVStructPyCode())
def loadPeIntoWorkspace(vw, pe, filename=None, baseaddr=None):
mach = pe.IMAGE_NT_HEADERS.FileHeader.Machine
arch = arch_names.get(mach)
if arch is None:
raise Exception("Machine %.4x is not supported for PE!" % mach)
vw.setMeta('Architecture', arch)
vw.setMeta('Format', 'pe')
platform = 'windows'
# Drivers are platform "winkern" so impapi etc works
subsys = pe.IMAGE_NT_HEADERS.OptionalHeader.Subsystem
if subsys == PE.IMAGE_SUBSYSTEM_NATIVE:
platform = 'winkern'
vw.setMeta('Platform', platform)
vw.setMeta('DefaultCall', defcalls.get(arch, 'unknown'))
# Set ourselves up for extended windows binary analysis
if baseaddr is None:
baseaddr = pe.IMAGE_NT_HEADERS.OptionalHeader.ImageBase
entry = pe.IMAGE_NT_HEADERS.OptionalHeader.AddressOfEntryPoint + baseaddr
entryrva = entry - baseaddr
codebase = pe.IMAGE_NT_HEADERS.OptionalHeader.BaseOfCode
codesize = pe.IMAGE_NT_HEADERS.OptionalHeader.SizeOfCode
codervamax = codebase + codesize
fvivname = filename
# This will help linkers with files that are re-named
dllname = pe.getDllName()
if dllname is not None:
fvivname = dllname
if fvivname is None:
fvivname = "pe_%.8x" % baseaddr
# grab the file bytes for hashing
pe.fd.seek(0)
bytez = pe.fd.read()
fhash = v_parsers.md5Bytes(bytez)
sha256 = v_parsers.sha256Bytes(bytez)
# create the file and store md5 and sha256 hashes
fname = vw.addFile(fvivname.lower(), baseaddr, fhash)
vw.setFileMeta(fname, 'sha256', sha256)
symhash = e_symcache.symCacheHashFromPe(pe)
vw.setFileMeta(fname, 'SymbolCacheHash', symhash)
# Add file version info if VS_VERSIONINFO has it
try:
vs = pe.getVS_VERSIONINFO()
except Exception as e:
vs = None
vw.vprint('Failed to load version info resource due to %s' %
(repr(e), ))
if vs is not None:
vsver = vs.getVersionValue('FileVersion')
if vsver is not None and len(vsver):
# add check to split seeing samples with spaces and nothing else..
parts = vsver.split()
if len(parts):
vsver = vsver.split()[0]
vw.setFileMeta(fname, 'Version', vsver)
# Setup some va sets used by windows analysis modules
vw.addVaSet("Library Loads",
(("Address", VASET_ADDRESS), ("Library", VASET_STRING)))
vw.addVaSet('pe:ordinals',
(('Address', VASET_ADDRESS), ('Ordinal', VASET_INTEGER)))
# SizeOfHeaders spoofable...
curr_offset = pe.IMAGE_DOS_HEADER.e_lfanew + len(pe.IMAGE_NT_HEADERS)
secsize = len(vstruct.getStructure("pe.IMAGE_SECTION_HEADER"))
sec_offset = pe.IMAGE_DOS_HEADER.e_lfanew + 4 + len(
pe.IMAGE_NT_HEADERS.FileHeader
) + pe.IMAGE_NT_HEADERS.FileHeader.SizeOfOptionalHeader
if sec_offset != curr_offset:
header_size = sec_offset + pe.IMAGE_NT_HEADERS.FileHeader.NumberOfSections * secsize
else:
header_size = pe.IMAGE_DOS_HEADER.e_lfanew + len(
pe.IMAGE_NT_HEADERS
) + pe.IMAGE_NT_HEADERS.FileHeader.NumberOfSections * secsize
# Add the first page mapped in from the PE header.
header = pe.readAtOffset(0, header_size)
secalign = pe.IMAGE_NT_HEADERS.OptionalHeader.SectionAlignment
subsys_majver = pe.IMAGE_NT_HEADERS.OptionalHeader.MajorSubsystemVersion
subsys_minver = pe.IMAGE_NT_HEADERS.OptionalHeader.MinorSubsystemVersion
secrem = len(header) % secalign
if secrem != 0:
header += "\x00" * (secalign - secrem)
vw.addMemoryMap(baseaddr, e_mem.MM_READ, fname, header)
vw.addSegment(baseaddr, len(header), "PE_Header", fname)
hstruct = vw.makeStructure(baseaddr, "pe.IMAGE_DOS_HEADER")
magicaddr = hstruct.e_lfanew
if vw.readMemory(baseaddr + magicaddr, 2) != "PE":
raise Exception("We only support PE exe's")
if not vw.isLocation(baseaddr + magicaddr):
padloc = vw.makePad(baseaddr + magicaddr, 4)
ifhdr_va = baseaddr + magicaddr + 4
ifstruct = vw.makeStructure(ifhdr_va, "pe.IMAGE_FILE_HEADER")
ohstruct = vw.makeStructure(ifhdr_va + len(ifstruct),
"pe.IMAGE_OPTIONAL_HEADER")
nxcompat = ohstruct.DllCharacteristics & PE.IMAGE_DLLCHARACTERISTICS_NX_COMPAT
# get resource data directory
ddir = pe.getDataDirectory(PE.IMAGE_DIRECTORY_ENTRY_RESOURCE)
loadrsrc = vw.config.viv.parsers.pe.loadresources
carvepes = vw.config.viv.parsers.pe.carvepes
deaddirs = [
PE.IMAGE_DIRECTORY_ENTRY_EXPORT, PE.IMAGE_DIRECTORY_ENTRY_IMPORT,
PE.IMAGE_DIRECTORY_ENTRY_RESOURCE, PE.IMAGE_DIRECTORY_ENTRY_EXCEPTION,
PE.IMAGE_DIRECTORY_ENTRY_SECURITY, PE.IMAGE_DIRECTORY_ENTRY_BASERELOC,
PE.IMAGE_DIRECTORY_ENTRY_DEBUG, PE.IMAGE_DIRECTORY_ENTRY_COPYRIGHT,
PE.IMAGE_DIRECTORY_ENTRY_ARCHITECTURE,
PE.IMAGE_DIRECTORY_ENTRY_GLOBALPTR,
PE.IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG,
PE.IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT, PE.IMAGE_DIRECTORY_ENTRY_IAT,
PE.IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT,
PE.IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR
]
deadvas = [ddir.VirtualAddress]
for datadir in deaddirs:
d = pe.getDataDirectory(datadir)
if d.VirtualAddress:
deadvas.append(d.VirtualAddress)
for idx, sec in enumerate(pe.sections):
mapflags = 0
chars = sec.Characteristics
if chars & PE.IMAGE_SCN_MEM_READ:
mapflags |= e_mem.MM_READ
isrsrc = (sec.VirtualAddress == ddir.VirtualAddress)
if isrsrc and not loadrsrc:
continue
# If it's for an older system, just about anything
# is executable...
# However, there is the DLLCHARACTERISTICS NXCOMPAT flag to take into account,
# which works with the OS to prevent certain pages of memory from achieving
# execution unless they're marked with the execute bit
# so we can't just blindly mark these as executable quite yet.
if not nxcompat:
if not vw.config.viv.parsers.pe.nx and subsys_majver < 6 and not isrsrc:
mapflags |= e_mem.MM_EXEC
if chars & PE.IMAGE_SCN_MEM_READ:
mapflags |= e_mem.MM_READ
if chars & PE.IMAGE_SCN_MEM_WRITE:
mapflags |= e_mem.MM_WRITE
if chars & PE.IMAGE_SCN_MEM_EXECUTE:
mapflags |= e_mem.MM_EXEC
if chars & PE.IMAGE_SCN_CNT_CODE:
mapflags |= e_mem.MM_EXEC
secrva = sec.VirtualAddress
secvsize = sec.VirtualSize
secfsize = sec.SizeOfRawData
secbase = secrva + baseaddr
secname = sec.Name.strip("\x00")
secrvamax = secrva + secvsize
# If the section is part of BaseOfCode->SizeOfCode
# force execute perms...
if secrva >= codebase and secrva < codervamax:
mapflags |= e_mem.MM_EXEC
# If the entry point is in this section, force execute
# permissions.
if secrva <= entryrva and entryrva < secrvamax:
mapflags |= e_mem.MM_EXEC
if not nxcompat:
if not vw.config.viv.parsers.pe.nx and subsys_majver < 6 and mapflags & e_mem.MM_READ:
mapflags |= e_mem.MM_EXEC
if sec.VirtualSize == 0 or sec.SizeOfRawData == 0:
if idx + 1 >= len(pe.sections):
continue
# fill the gap with null bytes..
nsec = pe.sections[idx + 1]
nbase = nsec.VirtualAddress + baseaddr
plen = nbase - secbase
readsize = sec.SizeOfRawData if sec.SizeOfRawData < sec.VirtualSize else sec.VirtualSize
secoff = pe.rvaToOffset(secrva)
secbytes = pe.readAtOffset(secoff, readsize)
secbytes += "\x00" * plen
vw.addMemoryMap(secbase, mapflags, fname, secbytes)
vw.addSegment(secbase, len(secbytes), secname, fname)
# Mark dead data on resource and import data directories
if sec.VirtualAddress in deadvas:
vw.markDeadData(secbase, secbase + len(secbytes))
#FIXME create a mask for this
if not (chars & PE.IMAGE_SCN_CNT_CODE) and not (
chars & PE.IMAGE_SCN_MEM_EXECUTE) and not (
chars & PE.IMAGE_SCN_MEM_WRITE):
vw.markDeadData(secbase, secbase + len(secbytes))
continue
# if SizeOfRawData is greater than VirtualSize we'll end up using VS in our read..
if sec.SizeOfRawData < sec.VirtualSize:
if sec.SizeOfRawData > pe.filesize:
continue
plen = sec.VirtualSize - sec.SizeOfRawData
try:
# According to http://code.google.com/p/corkami/wiki/PE#section_table if SizeOfRawData is larger than VirtualSize, VS is used..
readsize = sec.SizeOfRawData if sec.SizeOfRawData < sec.VirtualSize else sec.VirtualSize
secoff = pe.rvaToOffset(secrva)
secbytes = pe.readAtOffset(secoff, readsize)
secbytes += "\x00" * plen
vw.addMemoryMap(secbase, mapflags, fname, secbytes)
vw.addSegment(secbase, len(secbytes), secname, fname)
# Mark dead data on resource and import data directories
if sec.VirtualAddress in deadvas:
vw.markDeadData(secbase, secbase + len(secbytes))
#FIXME create a mask for this
if not (chars & PE.IMAGE_SCN_CNT_CODE) and not (
chars & PE.IMAGE_SCN_MEM_EXECUTE) and not (
chars & PE.IMAGE_SCN_MEM_WRITE):
vw.markDeadData(secbase, secbase + len(secbytes))
except Exception as e:
logger.warning(
"Error Loading Section (%s size:%d rva:%.8x offset: %d): %s",
secname, secfsize, secrva, secoff, e)
vw.addExport(entry, EXP_FUNCTION, '__entry', fname)
vw.addEntryPoint(entry)
# store the actual reloc section virtual address
reloc_va = pe.getDataDirectory(
PE.IMAGE_DIRECTORY_ENTRY_BASERELOC).VirtualAddress
if reloc_va:
reloc_va += baseaddr
vw.setFileMeta(fname, "reloc_va", reloc_va)
for rva, rtype in pe.getRelocations():
# map PE reloc to VIV reloc ( or dont... )
vtype = relmap.get(rtype)
if vtype is None:
logger.info('Skipping PE Relocation type: %d at %d (no handler)',
rtype, rva)
continue
mapoffset = vw.readMemoryPtr(rva + baseaddr) - baseaddr
vw.addRelocation(rva + baseaddr, vtype, mapoffset)
for rva, lname, iname in pe.getImports():
if vw.probeMemory(rva + baseaddr, 4, e_mem.MM_READ):
vw.makeImport(rva + baseaddr, lname, iname)
# Tell vivisect about ntdll functions that don't exit...
vw.addNoReturnApi("ntdll.RtlExitUserThread")
vw.addNoReturnApi("kernel32.ExitProcess")
vw.addNoReturnApi("kernel32.ExitThread")
vw.addNoReturnApi("kernel32.FatalExit")
vw.addNoReturnApiRegex("^msvcr.*\._CxxThrowException$")
vw.addNoReturnApiRegex("^msvcr.*\.abort$")
vw.addNoReturnApiRegex("^msvcr.*\.exit$")
vw.addNoReturnApiRegex("^msvcr.*\._exit$")
vw.addNoReturnApiRegex("^msvcr.*\.quick_exit$")
# https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/invalid-parameter-functions?view=vs-2019
# TODO: Again, there's a couple in there that have conditional termination that we should check for
#vw.addNoReturnApiRegex("vcruntime140.__std_terminate")
vw.addNoReturnApiRegex(
"^api_ms_win_crt_runtime_.*\._invalid_parameter_noinfo_noreturn$")
vw.addNoReturnApiRegex("^api_ms_win_crt_runtime_.*\.exit$")
vw.addNoReturnApiRegex("^api_ms_win_crt_runtime_.*\._exit$")
# TODO: we should add abort and terminate on the conditions that there are no signal handlers
# registered
# https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/cexit-c-exit?view=vs-2019
# vw.addNoReturnApiRegex("^msvcr.*\._cexit$")
# vw.addNoReturnApiRegex("^msvcr.*\._c_exit$")
vw.addNoReturnApi("ntoskrnl.KeBugCheckEx")
exports = pe.getExports()
for rva, ord, name in exports:
eva = rva + baseaddr
# Functions exported by ordinal only have no name
if not name:
name = "Ordinal_" + str(ord)
try:
vw.setVaSetRow('pe:ordinals', (eva, ord))
vw.addExport(eva, EXP_UNTYPED, name, fname)
if vw.probeMemory(eva, 1, e_mem.MM_EXEC):
vw.addEntryPoint(eva)
except Exception as e:
vw.vprint('addExport Failed: %s.%s (0x%.8x): %s' %
(fname, name, eva, e))
# Save off the ordinals...
vw.setFileMeta(fname, 'ordinals', exports)
fwds = pe.getForwarders()
for rva, name, forwardname in fwds:
vw.makeName(rva + baseaddr, "forwarder_%s.%s" % (fname, name))
vw.makeString(rva + baseaddr)
vw.setFileMeta(fname, 'forwarders', fwds)
# Check For SafeSEH list...
if pe.IMAGE_LOAD_CONFIG is not None:
vw.setFileMeta(fname, "SafeSEH", True)
va = pe.IMAGE_LOAD_CONFIG.SEHandlerTable
if va != 0:
vw.makeName(va, "%s.SEHandlerTable" % fname)
count = pe.IMAGE_LOAD_CONFIG.SEHandlerCount
# RP BUG FIX - sanity check the count
if count * 4 < pe.filesize and vw.isValidPointer(va):
# XXX - CHEAP HACK for some reason we have binaries still thorwing issues..
try:
# Just cheat and use the workspace with memory maps in it already
for h in vw.readMemoryFormat(va, "<%dP" % count):
sehva = baseaddr + h
vw.addEntryPoint(sehva)
#vw.hintFunction(sehva, meta={'SafeSEH':True})
except:
vw.vprint("SEHandlerTable parse error")
# Last but not least, see if we have symbol support and use it if we do
if vt_win32.dbghelp:
s = vt_win32.Win32SymbolParser(-1, filename, baseaddr)
# We don't want exports or whatever because we already have them
s.symopts |= vt_win32.SYMOPT_EXACT_SYMBOLS
s.parse()
# Add names for any symbols which are missing them
for symname, symva, size, flags in s.symbols:
if not vw.isValidPointer(symva):
continue
try:
if vw.getName(symva) is None:
vw.makeName(symva, symname, filelocal=True)
except Exception as e:
vw.vprint("Symbol Load Error: %s" % e)
# Also, lets set the locals/args name hints if we found any
vw.setFileMeta(fname, 'PELocalHints', s._sym_locals)
# if it has an EXCEPTION directory parse if it has the pdata
edir = pe.getDataDirectory(PE.IMAGE_DIRECTORY_ENTRY_EXCEPTION)
if edir.VirtualAddress and arch == 'amd64':
va = edir.VirtualAddress + baseaddr
vamax = va + edir.Size
while va < vamax:
f = vw.makeStructure(va, 'pe.IMAGE_RUNTIME_FUNCTION_ENTRY')
if not vw.isValidPointer(baseaddr + f.UnwindInfoAddress):
break
# FIXME UNWIND_INFO *requires* DWORD alignment, how is it enforced?
fva = f.BeginAddress + baseaddr
uiva = baseaddr + f.UnwindInfoAddress
# Possible method 1...
#uiva = baseaddr + (f.UnwindInfoAddress & 0xfffffffc )
# Possible method 2...
#uirem = f.UnwindInfoAddress % 4
#if uirem:
#uiva += ( 4 - uirem )
uinfo = vw.getStructure(uiva, 'pe.UNWIND_INFO')
ver = uinfo.VerFlags & 0x7
if ver != 1:
vw.vprint('Unwind Info Version: %d (bailing on .pdata)' % ver)
break
flags = uinfo.VerFlags >> 3
# Check if it's a function *block* rather than a function *entry*
if not (flags & PE.UNW_FLAG_CHAININFO):
vw.addEntryPoint(fva)
va += len(f)
# auto-mark embedded PEs as "dead data" to prevent code flow...
if carvepes:
pe.fd.seek(0)
fbytes = pe.fd.read()
for offset, i in pe_carve.carve(fbytes, 1):
# Found a sub-pe!
subpe = pe_carve.CarvedPE(fbytes, offset, chr(i))
pebytes = subpe.readAtOffset(0, subpe.getFileSize())
rva = pe.offsetToRva(offset) + baseaddr
vw.markDeadData(rva, rva + len(pebytes))
return fname
if __name__ == '__main__':
# Parse windows structures from dll symbols...
import os
import sys
import platform
from pprint import pprint
import PE
import vtrace.platforms.win32 as vt_win32
p = PE.PE(file(sys.argv[1], 'rb'))
baseaddr = p.IMAGE_NT_HEADERS.OptionalHeader.ImageBase
osmajor = p.IMAGE_NT_HEADERS.OptionalHeader.MajorOperatingSystemVersion
osminor = p.IMAGE_NT_HEADERS.OptionalHeader.MinorOperatingSystemVersion
machine = p.IMAGE_NT_HEADERS.FileHeader.Machine
archname = PE.machine_names.get(machine)
parser = vt_win32.Win32SymbolParser(0xffffffff, sys.argv[1], baseaddr)
parser.parse()
t = parser._sym_types.values()
e = parser._sym_enums.values()
builder = VStructBuilder(defs=t, enums=e)
print '# Version: %d.%d' % (osmajor, osminor)
print '# Architecture: %s' % archname
print builder.genVStructPyCode()
if count * 4 < pe.filesize and vw.isValidPointer(va):
# XXX - CHEAP HACK for some reason we have binaries still thorwing issues..
try:
# Just cheat and use the workspace with memory maps in it already
for h in vw.readMemoryFormat(va, "<%dP" % count):
sehva = baseaddr + h
vw.addEntryPoint(sehva)
#vw.hintFunction(sehva, meta={'SafeSEH':True})
except:
vw.vprint("SEHandlerTable parse error")
# Last but not least, see if we have symbol support and use it if we do
if vt_win32.dbghelp:
s = vt_win32.Win32SymbolParser(-1, filename, baseaddr)
# We don't want exports or whatever because we already have them
s.symopts |= vt_win32.SYMOPT_EXACT_SYMBOLS
s.parse()
# Add names for any symbols which are missing them
for symname, symva, size, flags in s.symbols:
if not vw.isValidPointer(symva):
continue
try:
if vw.getName(symva) == None:
vw.makeName(symva, symname, filelocal=True)
def loadPeIntoWorkspace(vw, pe, filename=None, baseaddr=None):
mach = pe.IMAGE_NT_HEADERS.FileHeader.Machine
arch = arch_names.get(mach)
if arch is None:
raise Exception("Machine %.4x is not supported for PE!" % mach)
vw.setMeta('Architecture', arch)
vw.setMeta('Format', 'pe')
platform = 'windows'
# Drivers are platform "winkern" so impapi etc works
subsys = pe.IMAGE_NT_HEADERS.OptionalHeader.Subsystem
if subsys == PE.IMAGE_SUBSYSTEM_NATIVE:
platform = 'winkern'
vw.setMeta('Platform', platform)
vw.setMeta('DefaultCall', defcalls.get(arch, 'unknown'))
# Set ourselves up for extended windows binary analysis
if baseaddr is None:
baseaddr = pe.IMAGE_NT_HEADERS.OptionalHeader.ImageBase
entry = pe.IMAGE_NT_HEADERS.OptionalHeader.AddressOfEntryPoint + baseaddr
entryrva = entry - baseaddr
codebase = pe.IMAGE_NT_HEADERS.OptionalHeader.BaseOfCode
codesize = pe.IMAGE_NT_HEADERS.OptionalHeader.SizeOfCode
codervamax = codebase + codesize
fvivname = filename
# This will help linkers with files that are re-named
dllname = pe.getDllName()
if dllname != None:
fvivname = dllname
if fvivname is None:
fvivname = "pe_%.8x" % baseaddr
fhash = "unknown hash"
if os.path.exists(filename):
fhash = v_parsers.md5File(filename)
fname = vw.addFile(fvivname.lower(), baseaddr, fhash)
symhash = e_symcache.symCacheHashFromPe(pe)
vw.setFileMeta(fname, 'SymbolCacheHash', symhash)
# Add file version info if VS_VERSIONINFO has it
try:
vs = pe.getVS_VERSIONINFO()
except Exception as e:
vs = None
vw.vprint('Failed to load version info resource due to %s' %
(repr(e), ))
if vs is not None:
vsver = vs.getVersionValue('FileVersion')
if vsver is not None and len(vsver):
# add check to split seeing samples with spaces and nothing else..
parts = vsver.split()
if len(parts):
vsver = vsver.split()[0]
vw.setFileMeta(fname, 'Version', vsver)
# Setup some va sets used by windows analysis modules
vw.addVaSet("Library Loads",
(("Address", VASET_ADDRESS), ("Library", VASET_STRING)))
vw.addVaSet('pe:ordinals',
(('Address', VASET_ADDRESS), ('Ordinal', VASET_INTEGER)))
# SizeOfHeaders spoofable...
curr_offset = pe.IMAGE_DOS_HEADER.e_lfanew + len(pe.IMAGE_NT_HEADERS)
secsize = len(vstruct.getStructure("pe.IMAGE_SECTION_HEADER"))
sec_offset = pe.IMAGE_DOS_HEADER.e_lfanew + 4 + len(
pe.IMAGE_NT_HEADERS.FileHeader
) + pe.IMAGE_NT_HEADERS.FileHeader.SizeOfOptionalHeader
if sec_offset != curr_offset:
header_size = sec_offset + pe.IMAGE_NT_HEADERS.FileHeader.NumberOfSections * secsize
else:
header_size = pe.IMAGE_DOS_HEADER.e_lfanew + len(
pe.IMAGE_NT_HEADERS
) + pe.IMAGE_NT_HEADERS.FileHeader.NumberOfSections * secsize
# Add the first page mapped in from the PE header.
header = pe.readAtOffset(0, header_size)
secalign = pe.IMAGE_NT_HEADERS.OptionalHeader.SectionAlignment
subsys_majver = pe.IMAGE_NT_HEADERS.OptionalHeader.MajorSubsystemVersion
subsys_minver = pe.IMAGE_NT_HEADERS.OptionalHeader.MinorSubsystemVersion
secrem = len(header) % secalign
# Lines below will extend the header to one page. In reality, some
# samples put code after the header but in the same page, so it is better
# to stick with header_size. See FLARE-662.
#if secrem != 0:
# header += "\x00" * (secalign - secrem)
vw.addMemoryMap(baseaddr, e_mem.MM_READ, fname, header)
vw.addSegment(baseaddr, len(header), "PE_Header", fname)
hstruct = vw.makeStructure(baseaddr, "pe.IMAGE_DOS_HEADER")
magicaddr = hstruct.e_lfanew
if vw.readMemory(baseaddr + magicaddr, 2) != "PE":
raise Exception("We only support PE exe's")
if not vw.isLocation(baseaddr + magicaddr):
padloc = vw.makePad(baseaddr + magicaddr, 4)
ifhdr_va = baseaddr + magicaddr + 4
ifstruct = vw.makeStructure(ifhdr_va, "pe.IMAGE_FILE_HEADER")
vw.makeStructure(ifhdr_va + len(ifstruct), "pe.IMAGE_OPTIONAL_HEADER")
# get resource data directory
ddir = pe.getDataDirectory(PE.IMAGE_DIRECTORY_ENTRY_RESOURCE)
loadrsrc = vw.config.viv.parsers.pe.loadresources
carvepes = vw.config.viv.parsers.pe.carvepes
deaddirs = [
PE.IMAGE_DIRECTORY_ENTRY_EXPORT, PE.IMAGE_DIRECTORY_ENTRY_IMPORT,
PE.IMAGE_DIRECTORY_ENTRY_RESOURCE, PE.IMAGE_DIRECTORY_ENTRY_EXCEPTION,
PE.IMAGE_DIRECTORY_ENTRY_SECURITY, PE.IMAGE_DIRECTORY_ENTRY_BASERELOC,
PE.IMAGE_DIRECTORY_ENTRY_DEBUG, PE.IMAGE_DIRECTORY_ENTRY_COPYRIGHT,
PE.IMAGE_DIRECTORY_ENTRY_ARCHITECTURE,
PE.IMAGE_DIRECTORY_ENTRY_GLOBALPTR,
PE.IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG,
PE.IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT, PE.IMAGE_DIRECTORY_ENTRY_IAT,
PE.IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT,
PE.IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR
]
deadvas = [ddir.VirtualAddress]
for datadir in deaddirs:
d = pe.getDataDirectory(datadir)
if d.VirtualAddress:
deadvas.append(d.VirtualAddress)
for idx, sec in enumerate(pe.sections):
logger.debug('loading section number %d', idx)
mapflags = 0
chars = sec.Characteristics
if chars & PE.IMAGE_SCN_MEM_READ:
mapflags |= e_mem.MM_READ
isrsrc = (sec.VirtualAddress == ddir.VirtualAddress)
if isrsrc and not loadrsrc:
continue
# If it's for an older system, just about anything
# is executable...
if not vw.config.viv.parsers.pe.nx and subsys_majver < 6 and not isrsrc:
mapflags |= e_mem.MM_EXEC
if chars & PE.IMAGE_SCN_MEM_READ:
mapflags |= e_mem.MM_READ
if chars & PE.IMAGE_SCN_MEM_WRITE:
mapflags |= e_mem.MM_WRITE
if chars & PE.IMAGE_SCN_MEM_EXECUTE:
mapflags |= e_mem.MM_EXEC
if chars & PE.IMAGE_SCN_CNT_CODE:
mapflags |= e_mem.MM_EXEC
secrva = sec.VirtualAddress
secvsize = sec.VirtualSize
secfsize = sec.SizeOfRawData
secbase = secrva + baseaddr
secname = sec.Name.strip("\x00")
secrvamax = secrva + secvsize
# If the section is part of BaseOfCode->SizeOfCode
# force execute perms...
if secrva >= codebase and secrva < codervamax:
mapflags |= e_mem.MM_EXEC
# If the entry point is in this section, force execute
# permissions.
if secrva <= entryrva and entryrva < secrvamax:
mapflags |= e_mem.MM_EXEC
if not vw.config.viv.parsers.pe.nx and subsys_majver < 6 and mapflags & e_mem.MM_READ:
mapflags |= e_mem.MM_EXEC
if sec.VirtualSize == 0 or sec.SizeOfRawData == 0:
if idx + 1 >= len(pe.sections):
continue
# fill the gap with null bytes..
nsec = pe.sections[idx + 1]
nbase = nsec.VirtualAddress + baseaddr
plen = nbase - secbase
readsize = sec.SizeOfRawData if sec.SizeOfRawData < sec.VirtualSize else sec.VirtualSize
secoff = pe.rvaToOffset(secrva)
secbytes = pe.readAtOffset(secoff, readsize)
secbytes += "\x00" * plen
vw.addMemoryMap(secbase, mapflags, fname, secbytes)
vw.addSegment(secbase, len(secbytes), secname, fname)
# Mark dead data on resource and import data directories
if sec.VirtualAddress in deadvas:
vw.markDeadData(secbase, secbase + len(secbytes))
#FIXME create a mask for this
if not (chars & PE.IMAGE_SCN_CNT_CODE) and not (
chars & PE.IMAGE_SCN_MEM_EXECUTE) and not (
chars & PE.IMAGE_SCN_MEM_WRITE):
vw.markDeadData(secbase, secbase + len(secbytes))
continue
# if SizeOfRawData is greater than VirtualSize we'll end up using VS in our read..
if sec.SizeOfRawData < sec.VirtualSize:
if sec.SizeOfRawData > pe.filesize:
continue
plen = sec.VirtualSize - sec.SizeOfRawData
try:
# According to http://code.google.com/p/corkami/wiki/PE#section_table if SizeOfRawData is larger than VirtualSize, VS is used..
readsize = sec.SizeOfRawData if sec.SizeOfRawData < sec.VirtualSize else sec.VirtualSize
secoff = pe.rvaToOffset(secrva)
if secname and (secname == '.data'):
# Allow truncated .data segment.
secbytes = pe.readAtOffset(secoff, readsize, shortok=True)
else:
secbytes = pe.readAtOffset(secoff, readsize)
secbytes += "\x00" * plen
logger.debug('mapping section: %d %s', idx, secname)
vw.addMemoryMap(secbase, mapflags, fname, secbytes)
vw.addSegment(secbase, len(secbytes), secname, fname)
# Mark dead data on resource and import data directories
if sec.VirtualAddress in deadvas:
vw.markDeadData(secbase, secbase + len(secbytes))
#FIXME create a mask for this
if not (chars & PE.IMAGE_SCN_CNT_CODE) and not (
chars & PE.IMAGE_SCN_MEM_EXECUTE) and not (
chars & PE.IMAGE_SCN_MEM_WRITE):
vw.markDeadData(secbase, secbase + len(secbytes))
except Exception as e:
logging.getLogger("parsers.pe.loadPE").warning(
"Error Loading Section (%s size:%d rva:%.8x offset: %d): %s",
secname, secfsize, secrva, secoff, e)
vw.addExport(entry, EXP_FUNCTION, '__entry', fname)
vw.addEntryPoint(entry)
# store the actual reloc section virtual address
reloc_va = pe.getDataDirectory(
PE.IMAGE_DIRECTORY_ENTRY_BASERELOC).VirtualAddress
if reloc_va:
reloc_va += baseaddr
vw.setFileMeta(fname, "reloc_va", reloc_va)
for rva, rtype in pe.getRelocations():
# map PE reloc to VIV reloc ( or dont... )
vtype = relmap.get(rtype)
if vtype is None:
logger.info('Skipping PE Relocation type: %d at %d (no handler)',
rtype, rva)
continue
mapoffset = vw.readMemoryPtr(rva + baseaddr) - baseaddr
vw.addRelocation(rva + baseaddr, vtype, mapoffset)
for rva, lname, iname in pe.getImports():
if vw.probeMemory(rva + baseaddr, 4, e_mem.MM_READ):
vw.makeImport(rva + baseaddr, lname, iname)
# Tell vivisect about ntdll functions that don't exit...
vw.addNoReturnApi("ntdll.RtlExitUserThread")
vw.addNoReturnApi("kernel32.ExitProcess")
vw.addNoReturnApi("kernel32.ExitThread")
vw.addNoReturnApi("kernel32.FatalExit")
vw.addNoReturnApiRegex("^msvcr.*\._CxxThrowException$")
vw.addNoReturnApiRegex("^msvcr.*\.abort$")
vw.addNoReturnApiRegex("^msvcr.*\.exit$")
vw.addNoReturnApiRegex("^msvcr.*\._exit$")
vw.addNoReturnApiRegex("^msvcr.*\._exit$")
vw.addNoReturnApiRegex("^msvcr.*\.quick_exit$")
# https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/cexit-c-exit?view=vs-2019
# vw.addNoReturnApiRegex("^msvcr.*\._cexit$")
# vw.addNoReturnApiRegex("^msvcr.*\._c_exit$")
vw.addNoReturnApi("ntoskrnl.KeBugCheckEx")
exports = pe.getExports()
for rva, ord, name in exports:
eva = rva + baseaddr
# Functions exported by ordinal only have no name
if not name:
name = "Ordinal_" + str(ord)
try:
vw.setVaSetRow('pe:ordinals', (eva, ord))
vw.addExport(eva, EXP_UNTYPED, name, fname)
if vw.probeMemory(eva, 1, e_mem.MM_EXEC):
vw.addEntryPoint(eva)
except Exception as e:
vw.vprint('addExport Failed: %s.%s (0x%.8x): %s' %
(fname, name, eva, e))
# Save off the ordinals...
vw.setFileMeta(fname, 'ordinals', exports)
fwds = pe.getForwarders()
for rva, name, forwardname in fwds:
vw.makeName(rva + baseaddr, "forwarder_%s.%s" % (fname, name))
vw.makeString(rva + baseaddr)
vw.setFileMeta(fname, 'forwarders', fwds)
# Check For SafeSEH list...
if pe.IMAGE_LOAD_CONFIG != None:
vw.setFileMeta(fname, "SafeSEH", True)
va = pe.IMAGE_LOAD_CONFIG.SEHandlerTable
if va != 0:
vw.makeName(va, "%s.SEHandlerTable" % fname)
count = pe.IMAGE_LOAD_CONFIG.SEHandlerCount
# RP BUG FIX - sanity check the count
if count * 4 < pe.filesize and vw.isValidPointer(va):
# XXX - CHEAP HACK for some reason we have binaries still thorwing issues..
try:
# Just cheat and use the workspace with memory maps in it already
for h in vw.readMemoryFormat(va, "<%dP" % count):
sehva = baseaddr + h
vw.addEntryPoint(sehva)
#vw.hintFunction(sehva, meta={'SafeSEH':True})
except:
vw.vprint("SEHandlerTable parse error")
# Last but not least, see if we have symbol support and use it if we do
if vt_win32.dbghelp:
s = vt_win32.Win32SymbolParser(-1, filename, baseaddr)
# We don't want exports or whatever because we already have them
s.symopts |= vt_win32.SYMOPT_EXACT_SYMBOLS
s.parse()
# Add names for any symbols which are missing them
for symname, symva, size, flags in s.symbols:
if not vw.isValidPointer(symva):
continue
try:
if vw.getName(symva) is None:
vw.makeName(symva, symname, filelocal=True)
except Exception, e:
vw.vprint("Symbol Load Error: %s" % e)
# Also, lets set the locals/args name hints if we found any
vw.setFileMeta(fname, 'PELocalHints', s._sym_locals)
