def getSymbolsList(sample, strs):
endian = utils.getEndianFormat(sample)
count = 0
symbols = {}
symbolsList = []
step = 0
desc = utils.getCommandInfos(sample, "LC_SYMTAB")
baseStrAddr = desc.get("stroff")
symAddress = desc.get("symoff")
nsym = desc.get("nsyms")
if utils.is64Bit(sample):
step = 16
utils.getPartOfFile(sample, symAddress, nsym * 16)
else:
step = 12
utils.getPartOfFile(sample, symAddress, nsym * 12)
os.rename("temp", "tmp")
offset = 0
while count < nsym:
count += 1
byte, data = ReadWrite.readInt32("tmp", endian, offset)
offset += step
value = strs.get(hex(baseStrAddr + data).rstrip("L"))
if value is None:
value = ""
symbolsList.append(value)
os.remove("tmp")
return symbolsList
def getSymbolTables(filePath, outputPath):
logger = utils.setLogger()
strs = utils.getSymbolStrs(filePath)
desc = utils.getCommandInfos(filePath, "LC_SYMTAB")
strAddress = desc.get("stroff")
symAddress = desc.get("symoff")
if utils.is64Bit(filePath):
utils.getPartOfFile(filePath, desc.get("symoff"),
desc.get("nsyms") * 16)
os.rename("temp", "tmp")
symbolStrs = SymbolContents.createSymbols64Node(
filePath, strs, "tmp", symAddress, strAddress, desc.get("nsyms"))
else:
utils.getPartOfFile(filePath, desc.get("symoff"),
desc.get("nsyms") * 12)
os.rename("temp", "tmp")
symbolStrs = SymbolContents.createSymbolsNode(filePath, strs, "tmp",
symAddress, strAddress,
desc.get("nsyms"))
desc["symbols"] = symbolStrs
os.remove("tmp")
outFinal = json.dumps(desc, encoding='latin1')
with open(outputPath + "/" + "symbolTables", "w") as f:
f.write(outFinal)
logger.info("It has got all infos of symbol tables sucessfully")
def getISymbols(sample):
endian = utils.getEndianFormat(sample)
symbols = utils.getSymbolStrs(sample)
symbolsList = getSymbolsList(sample, symbols)
sections = utils.getSections(sample)
is64 = utils.is64Bit(sample)
count = 0
inSymbols = {}
offset = 0
desc = utils.getCommandInfos(sample, "LC_DYSYMTAB")
inSymAddress = desc.get("indirectsymoff")
nSymbol = desc.get("nindirectsyms")
utils.getPartOfFile(sample, inSymAddress, nSymbol * 4)
os.rename("temp", "tmp")
while count < nSymbol:
nsect = len(sections)
while nsect > 0:
nsect -= 1
section = sections[nsect]
flag = section.flags
# print(section.reserved1)
if (flag & SECTION_TYPE != S_SYMBOL_STUBS \
and flag & SECTION_TYPE != S_LAZY_SYMBOL_POINTERS \
and flag & SECTION_TYPE != S_LAZY_DYLIB_SYMBOL_POINTERS \
and flag & SECTION_TYPE != S_NON_LAZY_SYMBOL_POINTERS) \
or section.reserved1 > count:
#section type or indirect symbol index mismatch
continue
nsect = 0
#calculate stub or pointer length
if section.reserved2 > 0:
length = section.reserved2
else:
if is64:
length = 8
else:
length = 4
#calculate indirect value location
indirectOffset = section.offset + (count -
section.reserved1) * length
#read indirect symbol index
byte, indirectIndex = ReadWrite.readInt32("tmp", endian, offset)
offset += byte
if indirectIndex & (INDIRECT_SYMBOL_LOCAL
| INDIRECT_SYMBOL_ABS) == 0:
if indirectIndex >= len(symbolsList):
raise Exception("index is out of range " +
str(indirectIndex))
symbolName = utils.getSymbolByIndex(symbolsList, indirectIndex)
inSymbols[hex(indirectOffset).rstrip("L")] = symbolName
count += 1
os.remove("tmp")
return inSymbols
def createTextNode(sample, section, outputPath):
#prepare disassembler params
header = utils.getHeader(sample)
strs = utils.getSymbolStrs(sample)
inSymbols = SymbolContents.getISymbols(sample)
names = SymbolContents.getFunctionNames(sample, strs)
#open capstone
target_arch = 0
target_mode = 0
if header.header.cputype == CPU_TYPE_ARM:
target_arch = CS_ARCH_ARM
target_mode = CS_MODE_ARM
elif header.header.cputype == CPU_TYPE_ARM64:
target_arch = CS_ARCH_ARM64
target_mode = CS_MODE_ARM
else:
print("NO CPU FOUND!")
md = Cs(target_arch, target_mode)
md.skipdata = True
md.detail = True
#set or not thumb mode for 32 bits ARM targets
if header.header.cputype == CPU_TYPE_ARM:
if header.header.cpusubtype == CPU_SUBTYPE_ARM_V7 \
or header.header.cpusubtype == CPU_SUBTYPE_ARM_V7F \
or header.header.cpusubtype == CPU_SUBTYPE_ARM_V7S \
or header.header.cpusubtype == CPU_SUBTYPE_ARM_V7K \
or header.header.cpusubtype == CPU_SUBTYPE_ARM_V8 :
md.mode = CS_MODE_THUMB
else:
md.mode = CS_MODE_ARM
code = Codes(md)
utils.getPartOfFile(sample, section.offset, section.size)
os.rename("temp", "codes")
if section.sectname.rstrip('\x00') == "__text":
desc = utils.getCommandInfos(sample, "LC_FUNCTION_STARTS")
utils.getPartOfFile(sample, desc.get("dataoff"), desc.get("datasize"))
if utils.is64Bit(sample):
getFunctions(code, inSymbols, names, "temp", section.offset,
outputPath)
else:
getFunctions(code, inSymbols, names, "temp", section.offset,
outputPath)
os.remove("temp")
else:
fcode = open("codes", "rb")
CODE = fcode.read()
code.disAssembly(md, inSymbols, CODE, section.offset, outputPath)
fcode.close()
os.remove("codes")
def getFunctionNames(sample, strs):
endian = utils.getEndianFormat(sample)
sectionInfos = utils.getSectionInfoMaps(sample)
desc = utils.getCommandInfos(sample, "LC_SYMTAB")
baseStrAddr = desc.get("stroff")
symAddress = desc.get("symoff")
nsym = desc.get("nsyms")
if utils.is64Bit(sample):
step = 16
utils.getPartOfFile(sample, symAddress, nsym * 16)
else:
step = 12
utils.getPartOfFile(sample, symAddress, nsym * 12)
os.rename("temp", "tmp")
count = 0
names = {}
offset = 0
is64 = utils.is64Bit(sample)
while count < nsym:
count += 1
byte, data = ReadWrite.readInt32("tmp", endian, offset)
offset += 8
value = strs.get(hex(baseStrAddr + data).rstrip("L"))
if value is None:
continue
if is64:
byte, n_value = ReadWrite.readInt64("tmp", endian, offset)
else:
byte, n_value = ReadWrite.readInt32("tmp", endian, offset)
offset += byte
key = utils.addressToFileOffset(sample, sectionInfos, n_value)
names[hex(key)] = value
os.remove("tmp")
return names
def getAllLoadCommandInfos(filePath, outputPath):
infos = {}
logger = utils.setLogger()
header = utils.getHeader(filePath)
for (index, (lc, cmd, data)) in enumerate(header.commands):
command = {}
desc = cmd.describe()
lc_name = lc.get_cmd_name()
if lc_name == 44:
if utils.is64Bit(filePath):
lc_name = "LC_ENCRYPTION_INFO_64"
else:
lc_name = "LC_ENCRYPTION_INFO"
if isinstance(data, str):
desc["Name"] = data.rstrip('\x00')
command[lc_name] = desc
infos[index] = command
infos = collections.OrderedDict(sorted(infos.items()))
outFinal = json.dumps(infos, encoding='latin1')
with open(outputPath + "/" + "loadCommands", "w") as f:
f.write(outFinal)
logger.info("It has got all infos of load commands sucessfully")
def getClassSymbols(sample):
endian = utils.getEndianFormat(sample)
strs = utils.getSymbolStrs(sample)
desc = utils.getCommandInfos(sample, "LC_SYMTAB")
baseStrAddr = desc.get("stroff")
symAddress = desc.get("symoff")
nsym = desc.get("nsyms")
is64 = utils.is64Bit(sample)
if is64:
utils.getPartOfFile(sample, symAddress, nsym * 16)
else:
utils.getPartOfFile(sample, symAddress, nsym * 12)
count = 0
classSymbols = {}
offset = 0
while count < nsym:
count += 1
byte, data = ReadWrite.readInt32("temp", endian, offset)
offset += byte
description = "String Table Index"
value = strs.get(hex(baseStrAddr + data).rstrip("L"))
if value is None:
value = ""
offset += 4
if is64:
byte, n_value = ReadWrite.readInt64("temp", endian, offset)
else:
byte, n_value = ReadWrite.readInt32("temp", endian, offset)
offset += byte
classSymbols[hex(n_value).rstrip("L")] = value
classSymbols = collections.OrderedDict(sorted(classSymbols.items()))
return classSymbols
def createISymbolsNode(sample, symbolsList, path, baseAddr, nindsym):
endian = utils.getEndianFormat(sample)
sections = utils.getSections(sample)
is64 = utils.is64Bit(sample)
count = 0
inSymbols = {}
addr = baseAddr
offset = 0
while count < nindsym:
desc = []
nsect = len(sections)
while nsect > 0:
nsect -= 1
section = sections[nsect]
flag = section.flags
# print(section.reserved1)
if (flag & SECTION_TYPE != S_SYMBOL_STUBS \
and flag & SECTION_TYPE != S_LAZY_SYMBOL_POINTERS \
and flag & SECTION_TYPE != S_LAZY_DYLIB_SYMBOL_POINTERS \
and flag & SECTION_TYPE != S_NON_LAZY_SYMBOL_POINTERS) \
or section.reserved1 > count:
#section type or indirect symbol index mismatch
continue
nsect = 0
#calculate stub or pointer length
if section.reserved2 > 0:
length = section.reserved2
else:
if is64:
length = 8
else:
length = 4
#calculate indirect value location
indirectOffset = section.offset + (count -
section.reserved1) * length
#read indirect symbol index
byte, indirectIndex = ReadWrite.readInt32(path, endian, offset)
offset += byte
if indirectIndex & (INDIRECT_SYMBOL_LOCAL
| INDIRECT_SYMBOL_ABS) == 0:
if indirectIndex >= len(symbolsList):
raise Exception("index is out of range " +
str(indirectIndex))
symbolName = utils.getSymbolByIndex(symbolsList, indirectIndex)
description = "Symbol"
value = symbolName
desc.append(utils.getDict(description, value))
else:
description = "Symbol"
value = []
if indirectIndex == INDIRECT_SYMBOL_LOCAL:
value.append("80000000 INDIRECT_SYMBOL_LOCAL")
elif indirectIndex == INDIRECT_SYMBOL_ABS:
value.append("40000000 INDIRECT_SYMBOL_ABS")
else:
value.append("80000000 INDIRECT_SYMBOL_LOCAL")
value.append("40000000 INDIRECT_SYMBOL_ABS")
desc.append(utils.getDict(description, value))
description = "Section"
value = "(" + section.segname.rstrip(
'\x00') + "," + section.sectname.rstrip('\x00') + ")"
desc.append(utils.getDict(description, value))
description = "Indirect Address"
value = hex(indirectOffset).rstrip("L") + "($+" + str(
indirectOffset - section.offset) + ")"
desc.append(utils.getDict(description, value))
inSymbols[hex(addr)] = desc
addr += byte
count += 1
inSymbols = collections.OrderedDict(sorted(inSymbols.items()))
return inSymbols
def processObjcSections(filePath, outputPath, sections):
logger = utils.setLogger()
cfStrings = {}
cStrings = utils.getCStrings(filePath)
sectionInfos = utils.getSectionInfoMaps(filePath)
hasObjCModules = False
for section in sections:
sectionName = section.sectname.rstrip("\x00")
segmentName = section.segname.rstrip("\x00")
if sectionName == "__cfstring":
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc["C String Literals"] = objc.createObjCCFStrings64Node(
filePath, section, cStrings, sectionInfos)
else:
secDesc["C String Literals"] = objc.createObjCCFStringsNode(
filePath, section, cStrings, sectionInfos)
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
#first Objective-C ABI
if sectionName == "__module_info" and segmentName == "__OBJC":
hasObjCModules = True
secDesc = section.describe()
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
if sectionName == "__class_ext" and segmentName == "__OBJC":
secDesc = section.describe()
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
if sectionName == "__protocol_ext" and segmentName == "__OBJC":
secDesc = section.describe()
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
#second Objective-C ABI
if not hasObjCModules:
if (sectionName == "__category_list" and segmentName == "__OBJC2") \
or (sectionName == "__objc_catlist" and segmentName == "__DATA"):
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc[
"ObjC2 Category List"] = objc.createObjC2Pointer64ListNode(
filePath, section)
else:
secDesc[
"ObjC2 Category List"] = objc.createObjC2PointerListNode(
filePath, section)
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
if (sectionName == "__class_list" and segmentName == "__OBJC2") \
or (sectionName == "__objc_classlist" and segmentName == "__DATA"):
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc[
"ObjC2 Class List"] = objc.createObjC2Pointer64ListNode(
filePath, section)
else:
secDesc[
"ObjC2 Class List"] = objc.createObjC2PointerListNode(
filePath, section)
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
if (sectionName == "__class_refs" and segmentName == "__OBJC2") \
or (sectionName == "__objc_classrefs" and segmentName == "__DATA"):
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc[
"ObjC2 References"] = objc.createObjC2Pointer64ListNode(
filePath, section)
else:
secDesc[
"ObjC2 References"] = objc.createObjC2PointerListNode(
filePath, section)
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
if (sectionName == "__super_refs" and segmentName == "__OBJC2") \
or (sectionName == "__objc_superrefs" and segmentName == "__DATA"):
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc[
"ObjC2 References"] = objc.createObjC2Pointer64ListNode(
filePath, section)
else:
secDesc[
"ObjC2 References"] = objc.createObjC2PointerListNode(
filePath, section)
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
if (sectionName == "__protocol_list" and segmentName == "__OBJC2") \
or (sectionName == "__objc_protolist" and segmentName == "__DATA"):
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc[
"ObjC2 Pointer List"] = objc.createObjC2Pointer64ListNode(
filePath, section)
else:
secDesc[
"ObjC2 Pointer List"] = objc.createObjC2PointerListNode(
filePath, section)
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
if (sectionName == "__message_refs" and segmentName == "__OBJC2") \
or (sectionName == "__objc_msgrefs" and segmentName == "__DATA"):
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc[
"ObjC2 Message References"] = objc.createObjC2MsgRefs64Node(
filePath, section)
else:
secDesc[
"ObjC2 Message References"] = objc.createObjC2MsgRefsNode(
filePath, section)
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
if (sectionName == "__image_info" and segmentName == "__OBJC2") \
or (sectionName == "__objc_imageinfo" and segmentName == "__DATA"):
secDesc = section.describe()
secDesc["ObjC2 Image Info"] = objc.createObjCImageInfoNode(
filePath, section)
cfStrings[segmentName + "(" + sectionName + ")"] = secDesc
outFinal = json.dumps(cfStrings, encoding='latin1')
with open(outputPath + "/" + "objcInfos", "w") as f:
f.write(outFinal)
logger.info(
"It has got all infos of objective-c sections in the mach-o file sucessfully"
)
def getAllPointersOfMacho(filePath, outputPath):
logger = utils.setLogger()
pointers = {}
sections = utils.getSections(filePath)
symbolNames = utils.getMethodNames(filePath)
inSymbols = SymbolContents.getISymbols(filePath)
for section in sections:
flag = section.flags & SECTION_TYPE
if flag == S_4BYTE_LITERALS:
secDesc = section.describe()
secDesc[
"Floating Point Literals"] = SectionContents.createLiteralsNode(
filePath, section, 4)
pointers[section.sectname.rstrip('\x00')] = secDesc
elif flag == S_8BYTE_LITERALS:
secDesc = section.describe()
secDesc[
"Floating Point Literals"] = SectionContents.createLiteralsNode(
filePath, section, 8)
pointers[section.sectname.rstrip('\x00')] = secDesc
elif flag == S_16BYTE_LITERALS:
secDesc = section.describe()
secDesc[
"Floating Point Literals"] = SectionContents.createLiteralsNode(
filePath, section, 8)
pointers[section.sectname.rstrip('\x00')] = secDesc
#================ sections with pointer content ============================
elif flag == S_LITERAL_POINTERS:
secDesc = section.describe()
secDesc["Literal Pointers"] = SectionContents.createPointersNode(
filePath, section, symbolNames)
pointers[section.sectname.rstrip('\x00')] = secDesc
elif flag == S_MOD_INIT_FUNC_POINTERS:
secDesc = section.describe()
secDesc[
"Module Init Func Pointers"] = SectionContents.createPointersNode(
filePath, section, symbolNames)
pointers[section.sectname.rstrip('\x00')] = secDesc
elif flag == S_MOD_TERM_FUNC_POINTERS:
secDesc = section.describe()
secDesc[
"Module Term Func Pointers"] = SectionContents.createPointersNode(
filePath, section, symbolNames)
pointers[section.sectname.rstrip('\x00')] = secDesc
elif flag == S_LAZY_SYMBOL_POINTERS:
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc[
"Lazy Symbol Pointers"] = SectionContents.createIndPointers64Node(
filePath, section, inSymbols)
else:
secDesc[
"Lazy Symbol Pointers"] = SectionContents.createIndPointersNode(
filePath, section, inSymbols)
pointers[section.sectname.rstrip('\x00')] = secDesc
elif flag == S_NON_LAZY_SYMBOL_POINTERS:
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc[
"Non-Lazy Symbol Pointers"] = SectionContents.createIndPointers64Node(
filePath, section, inSymbols)
else:
secDesc[
"Non-Lazy Symbol Pointers"] = SectionContents.createIndPointersNode(
filePath, section, inSymbols)
pointers[section.sectname.rstrip('\x00')] = secDesc
elif flag == S_LAZY_DYLIB_SYMBOL_POINTERS:
secDesc = section.describe()
if utils.is64Bit(filePath):
secDesc[
"Lazy Dylib Symbol Pointers"] = SectionContents.createIndPointers64Node(
filePath, section, inSymbols)
else:
secDesc[
"Lazy Dylib Symbol Pointers"] = SectionContents.createIndPointersNode(
filePath, section, inSymbols)
pointers[section.sectname.rstrip('\x00')] = secDesc
elif flag == S_SYMBOL_STUBS:
secDesc = section.describe()
secDesc["Symbol Stubs"] = SectionContents.createIndStubsNode(
filePath, section, inSymbols)
pointers[section.sectname.rstrip('\x00')] = secDesc
else:
pass
outFinal = json.dumps(pointers, encoding='latin1')
with open(outputPath + "/" + "pointers", "w") as f:
f.write(outFinal)
