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V8MapScan.py
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import volatility.plugins.common as common
import volatility.plugins.malware.malfind as malfind
import volatility.utils as utils
import volatility.win32 as win32
import volatility.plugins.addrspaces as addrspaces
import volatility.renderers.basic as RenderType
import json
import re
import base64
import ntpath
import csv
import binascii
import struct
import collections
import pprint
import sys
from volatility.renderers import TreeGrid
from volatility.renderers.text import TextRenderer
from volatility.renderers.html import JSONRenderer
pp = pprint.PrettyPrinter(indent=4)
try:
import yara
HAS_YARA = True
except ImportError:
HAS_YARA = False
WORD_SIZE = 4
DWORD_SIZE = WORD_SIZE * 2
ISOLATE_PTR_OFFSETS = [0x0, 0x38, 0x0, 0x10]
ROOT_SET_OFFSET = 0x10 * DWORD_SIZE
META_MAP_OFFSET = 0xA * DWORD_SIZE
PAGE_SIZE = 0x1000
YARA_opcodes = {
'opcodes':
'rule opcodes { \
strings: $p = { ff 03 (20 | 40) 00 00 00 00 00 } \
condition: $p \
}'
}
# 0x03e3ff3c1160
#
class v8_extractprops(common.AbstractWindowsCommand):
def init(self, config, *args, **kwargs):
common.AbstractWindowsCommand.init(self, config, *args, **kwargs)
config.add_option('OUTDIR', short_option='Z', default=None,
help='outfile')
def calculate(self):
rules_opcodes = yara.compile(sources=YARA_opcodes)
rulesets = [rules_opcodes]
addr_space = utils.load_as(self._config)
tasks = win32.tasks.pslist(addr_space)
maps = []
not_maps = []
pid = input("Enter PID: ")
instancetype = input("Enter Instance Type Hex: ")
for task in tasks:
if task.UniqueProcessId != pid:
continue
else:
print("Scanning {0} pid: {1}".format(task.ImageFileName, task.UniqueProcessId))
proc_addr_space = task.get_process_address_space()
scanner = malfind.DiscontigYaraScanner(proc_addr_space, rulesets)
addresss = 0x000
meta_map = find_metamap(scanner, proc_addr_space)
maps = get_maps(meta_map, proc_addr_space)
valid_maps = get_valid_maps(maps, proc_addr_space)
objs = get_objs_by_inst_type(instancetype, valid_maps, proc_addr_space)
# objs = get_arrays(valid_maps, proc_addr_space)
count = 0
myfile = open('extractProperties.txt', 'a')
myfile.writelines("%s\n" % str(obj.data) for obj in objs)
for obj in objs:
print(str(obj))
print(str(hex(obj.address)))
print(str(hex(obj.map.instance_type)))
print(obj.data)
count += 1
print("Total number: " + str(count))
myfile.close()
print("extractProperties.txt written")
# pp.pprint(collections.Counter(types))
def render_text(the, three, args):
print('written without errors')
class v8_findalltypes(common.AbstractWindowsCommand):
"""List all object types for findjsinstances"""
def calculate(self):
rules_opcodes = yara.compile(sources=YARA_opcodes)
rulesets = [rules_opcodes]
addr_space = utils.load_as(self._config)
tasks = win32.tasks.pslist(addr_space)
maps = []
not_maps = []
pid = input("Enter PID: ")
for task in tasks:
if task.UniqueProcessId != pid:
continue
else:
print("Scanning {0} pid: {1}".format(task.ImageFileName, task.UniqueProcessId))
proc_addr_space = task.get_process_address_space()
scanner = malfind.DiscontigYaraScanner(proc_addr_space, rulesets)
addresss = 0x000
meta_map = find_metamap(scanner, proc_addr_space)
maps = get_maps(meta_map, proc_addr_space)
valid_maps = get_valid_maps(maps, proc_addr_space)
return valid_maps
def generator(self, data):
new_data = []
name_found = False
for map in data:
for map_data in new_data:
if map_data[0] == map.type_name and map_data[1] == map.instance_type:
map_data[2] += 1
name_found = True
if not name_found:
new_data.append([map.type_name, map.instance_type, 1])
else:
name_found = False
for map in new_data:
yield (0, [
str(map[0]),
int(map[1]),
int(map[2])
])
def unified_output(self, data):
return TreeGrid([
("Name", str),
("Instance Type", int),
("Map Count", int)],
self.generator(data))
class v8_instancetypeaddr(common.AbstractWindowsCommand):
"""List all objects of a specific typename for jsprint"""
def calculate(self):
rules_opcodes = yara.compile(sources=YARA_opcodes)
rulesets = [rules_opcodes]
addr_space = utils.load_as(self._config)
tasks = win32.tasks.pslist(addr_space)
not_maps = []
for task in tasks:
if str(task.ImageFileName) != 'node.exe':
continue
else:
print("Scanning {0} pid: {1}".format(task.ImageFileName, task.UniqueProcessId))
proc_addr_space = task.get_process_address_space()
scanner = malfind.DiscontigYaraScanner(proc_addr_space, rulesets)
addresss = 0x000
meta_map = find_metamap(scanner, proc_addr_space)
maps = get_maps(meta_map, proc_addr_space)
valid_maps = get_valid_maps(maps, proc_addr_space)
type_name = input("Please enter the Instance Number: ")
print("Instance Number entered: " + str(type_name))
objs = get_objs_by_inst_type(type_name, valid_maps, proc_addr_space)
print("Number Object Address")
count = 1
for obj in objs:
print(str(count) + " " + str(hex(obj.address)))
#print(str(hex(obj.map.instance_type)))
#print(obj.data)
count = count + 1
exit()
class v8_extractobjects(common.AbstractWindowsCommand):
"""Print the details of a specific object"""
def calculate(self):
rules_opcodes = yara.compile(sources=YARA_opcodes)
rulesets = [rules_opcodes]
addr_space = utils.load_as(self._config)
tasks = win32.tasks.pslist(addr_space)
maps = []
not_maps = []
for task in tasks:
if str(task.ImageFileName) != 'node.exe':
continue
else:
print("Scanning {0} pid: {1}".format(task.ImageFileName, task.UniqueProcessId))
proc_addr_space = task.get_process_address_space()
scanner = malfind.DiscontigYaraScanner(proc_addr_space, rulesets)
obj_address = input("Please enter the object address: ")
# obj_address = 0x344bd600510 # 0x421 Object
# obj_address = 0x69637234d0 # 0x75 Array
# obj_address = 0x6963708ce8 # 0x8 String
print("Address entered: " + str(hex(obj_address)))
return get_object_by_addr(obj_address, proc_addr_space)
def generator1(self, data):
if is_string(data.map.instance_type):
yield (0, [
str("String"),
RenderType.Address64(data.map.address),
RenderType.Address64(data.address)
])
elif is_array(data.map.instance_type):
yield (0, [
str("Array"),
RenderType.Address64(data.map.address),
RenderType.Address64(data.address)
])
elif is_object(data.map.instance_type):
yield (0, [
str("Object"),
RenderType.Address64(data.map.address),
RenderType.Address64(data.address)
])
else:
yield (0, [
str("Error! This should never be reached!")
])
def generator2(self, data):
if is_string(data.map.instance_type):
yield (0, [
str(data.data)
])
elif is_array(data.map.instance_type):
for obj in data.data:
if len(obj) is 3:
yield (0, [
str(obj[0]),
str(obj[1]),
RenderType.Address64(obj[2])
])
elif len(obj) is 4: # TODO: Figure out how to recursively yield
yield (0, [
str(obj[0]),
str(obj[1]),
RenderType.Address64(obj[2])
])
elif is_object(data.map.instance_type):
for count, obj in enumerate(data.data.items()):
yield (0, [
int(count),
str(obj[0]),
RenderType.Address64(obj[1])
])
else:
yield (0, [
str("Error! This should never be reached!")
])
def unified_output1(self, data):
if is_string(data.map.instance_type):
return TreeGrid([
("Type", str),
("Map Address", RenderType.Address64),
("String Address", RenderType.Address64)],
self.generator1(data)
)
elif is_array(data.map.instance_type):
return TreeGrid([
("Type", str),
("Map Address", RenderType.Address64),
("Array Address", RenderType.Address64)],
self.generator1(data)
)
elif is_object(data.map.instance_type):
return TreeGrid([
("Type", str),
("Map Address", RenderType.Address64),
("Object Address", RenderType.Address64)],
self.generator1(data)
)
else:
return TreeGrid([
("Error", str)],
self.generator1(data)
)
def unified_output2(self, data):
if is_string(data.map.instance_type):
return TreeGrid([
("String", str)],
self.generator2(data)
)
elif is_array(data.map.instance_type):
return TreeGrid([
("Property Number", str),
("Property Type", str),
("Property", RenderType.Address64)],
self.generator2(data)
)
elif is_object(data.map.instance_type):
return TreeGrid([
("Number", int),
("Object Name", str),
("Object Address", RenderType.Address64)],
self.generator2(data)
)
else:
return TreeGrid([
("Error", str)],
self.generator2(data)
)
def render_text(self, outfd, data):
renderer = TextRenderer(self.text_cell_renderers, sort_column=self.text_sort_column)
renderer.render(outfd, self.unified_output1(data))
renderer.render(outfd, self.unified_output2(data))
def render_json(self, outfd, data):
renderer = JSONRenderer()
renderer.render(outfd, self.unified_output1(data))
renderer.render(outfd, self.unified_output2(data))
def find_metamap(scanner, proc_addr_space):
addresslist = []
for hit_obj, offset in scanner.scan():
address = offset # Search bytecode signatures
raw_data = proc_addr_space.zread(address, DWORD_SIZE)
address = address - 18
meta_map_ptr = proc_addr_space.zread(address, DWORD_SIZE) # Read pointer stored in same structure
addresslist.append(hex(read_double_word(meta_map_ptr)))
dup = [x for i, x in enumerate(addresslist) if i != addresslist.index(x)] # Find duplicates and select the most common element
str_meta_map = dup[0]
str_meta_map = str_meta_map.rstrip('0') # Concatenate the first 13 indexes
address = int(str_meta_map, 16)
address = address - 1
print("Meta Map Address: " + str(hex(address)))
raw_data = proc_addr_space.zread(address, DWORD_SIZE)
print("New Meta Map Value : " + hex(read_double_word(raw_data)))
return address + 1
def get_arrays(valid_maps, addr_space):
objs = []
for mp in valid_maps:
if is_basic_array(mp.instance_type):
objs += get_objects(mp, addr_space, 0, 100)
return objs
def get_objs_by_name(name, valid_maps, addr_space):
objs = []
for mp in valid_maps:
if mp.type_name == name:
objs += get_objects(mp, addr_space, 0, 100)
return objs
def get_objs_by_name(inst_type, valid_maps, addr_space):
objs = []
count = 0
max = input("Enter MAX Number:")
for mp in valid_maps:
if mp.instance_type == inst_type:
objs += get_objects(mp, addr_space, count, max)
count = len(objs)
if count >= max:
return objs
return objs
def get_obj_addrs_by_name(name, valid_maps, addr_space):
objs = []
for mp in valid_maps:
if mp.type_name == name:
print("Map found: " + str(hex(mp.address)))
objs += get_obj_addresses(mp, addr_space)
return objs
def get_objs_by_inst_type(inst_type, valid_maps, addr_space):
objs = []
count = 0
max = input("Enter Max number of objects: ")
for mp in valid_maps:
if mp.instance_type == inst_type:
objs += get_objects(mp, addr_space, count, max)
count = len(objs)
if count >= max:
return objs
return objs
def get_meta_map(isolate_ptr, addr_space):
addr = isolate_ptr + ROOT_SET_OFFSET + META_MAP_OFFSET
maybe_meta_map_ptr = read_dword_as_int(addr, addr_space) - 1
maybe_meta_map = parse_map(maybe_meta_map_ptr, addr_space)
if not maybe_meta_map.is_meta_map():
# if this is not the correct map, try the metamap this map references
maybe_meta_map = parse_map(maybe_meta_map.meta_map - 1, addr_space)
if not maybe_meta_map.is_meta_map():
print("Cannot find metamap")
exit()
return maybe_meta_map
def read_dword_as_int(address, addr_space):
raw_data = addr_space.zread(address, DWORD_SIZE)
return read_double_word(raw_data)
def read_word_as_int(address, addr_space):
raw_data = addr_space.zread(address, WORD_SIZE)
return read_word(raw_data)
def get_isolate(first_ptr, addr_space):
print("Begin walking pointers")
current_ptr = first_ptr
for offset in ISOLATE_PTR_OFFSETS:
print("Current pointer: " + str(hex(current_ptr)))
raw_data = addr_space.zread(current_ptr + offset, DWORD_SIZE)
current_ptr = read_double_word(raw_data)
return current_ptr
def read_word(raw_word):
return struct.unpack("<I", raw_word)[0]
def read_double_word(raw_double_word):
return struct.unpack("<Q", raw_double_word)[0]
def parse_map(addr, addr_space):
raw_data = addr_space.zread(addr, V8Map.MAP_SIZE)
return V8Map(raw_data, addr, addr_space)
def parse_proto_map(addr, addr_space):
raw_data = addr_space.zread(addr, V8Map.MAP_SIZE)
return V8ProtoMap(raw_data, addr, addr_space)
def get_valid_maps(maps, addr_space):
valid = []
for mp in maps:
if mp.valid:
valid.append(mp)
return valid
def get_maps(meta_map_ptr, addr_space):
scanner = get_custom_yara_scanner(meta_map_ptr, addr_space)
maps = []
for hit_obj, address in scanner.scan():
maybe_map = parse_map(address, addr_space)
if maybe_map.valid:
maps.append(maybe_map)
return maps
def swap64(word):
return struct.pack("<Q", word)
def validate_meta_map(ptr, addr_space):
pass
def get_custom_yara_scanner(addr, addr_space):
# Takes a 64 bit integer and returns a scanner object
hex_string = swap64(addr).encode("hex")
rule_raw = 'rule custom {{ \
strings: $p = {{{0}}} \
condition: $p \
}}'.format(hex_string)
rule = {'rule': rule_raw}
rule_compiled = yara.compile(sources=rule)
ruleset = [rule_compiled]
return malfind.DiscontigYaraScanner(addr_space, ruleset)
def get_obj_addresses(mp, addr_space):
scanner = get_custom_yara_scanner(mp.address + 1, addr_space)
objs = []
for hit_obj, address in scanner.scan():
print("Object found: " + str(hex(address)))
objs.append(address)
print(str(len(objs)) + " Objects found")
return objs
def is_string(instance_type):
return 0x0 <= instance_type <= 0x3F
def is_basic_array(instance_type):
true = 0x75 <= instance_type <= 0x77 or 0x80 <= instance_type <= 0x82 or instance_type == 0x84
true = true or instance_type == 0xab
return true
def is_array(instance_type): # There are many different array types scattered practically randomly throughout the list
true = instance_type == 0x57 or 0x75 <= instance_type <= 0x87 or 0x98 <= instance_type <= 0x99
true = true or 0x9E <= instance_type <= 0x9F or instance_type == 0xA4 or instance_type == 0xAE
true = true or instance_type == 0xB5 or instance_type == 0xB8 or instance_type == 0x41B
true = true or 0x437 <= instance_type <= 0x438 or instance_type == 0x43D or 0x424 <= instance_type <= 0x42F
return is_basic_array(instance_type) or true
def is_object(instance_type):
return instance_type == 0x421
def get_objects(mp, addr_space, count, max):
scanner = get_custom_yara_scanner(mp.address + 1, addr_space)
objs = []
if is_string(mp.instance_type):
for hit_obj, address in scanner.scan():
objs.append(V8String(address, mp, addr_space))
count += 1
if count >= max:
return objs
elif is_array(mp.instance_type):
for hit_obj, address in scanner.scan():
objs.append(V8Array(address, mp, addr_space))
# objs.append(address)
count += 1
if count >= max:
return objs
else:
for hit_obj, address in scanner.scan():
objs.append(V8Object(address, mp, addr_space))
return objs
def validate_string(string):
re1 = re.compile(r'[^a-zA-Z0-9.]')
return re1.search(string)
"""def get_objects(mp, addr_space):
scanner = get_custom_yara_scanner(mp.address + 1, addr_space)
objs = []
if is_string(mp.instance_type):
for hit_obj, address in scanner.scan():
objs.append(V8String(address, mp, addr_space))
elif is_array(mp.instance_type):
for hit_obj, address in scanner.scan():
objs.append(V8Array(address, mp, addr_space))
# objs.append(address)
else:
for hit_obj, address in scanner.scan():
objs.append(V8Object(address, mp, addr_space))
return objs"""
def get_object_by_addr(address, addr_space):
if addr_space.is_valid_address(address):
raw_map_ptr = addr_space.zread(address, DWORD_SIZE)
map_ptr = read_double_word(raw_map_ptr) - 1
raw_maybe_metamap_ptr = addr_space.zread(map_ptr, DWORD_SIZE)
maybe_metamap_ptr = read_double_word(raw_maybe_metamap_ptr) - 1
if map_ptr == maybe_metamap_ptr:
return parse_map(address, addr_space)
map = parse_map(map_ptr, addr_space)
if map.valid:
if is_string(map.instance_type):
return V8String(address, map, addr_space)
elif is_array(map.instance_type):
return V8Array(address, map, addr_space)
# return address
elif is_object(map.instance_type):
return V8Object(address, map, addr_space)
else:
print("Object type not supported!")
exit()
else:
print("Invalid map!")
exit()
else:
print("Error! Not a valid address!")
exit()
def print_object_properties(obj):
for num, prop in enumerate(obj.data, start=1):
print("\t\tProperty " + str(num) + ": " + str(hex(prop)))
class V8Array(object):
MAP_PTR_OFFSET = 0
LENGTH_OFFSET = 1 * DWORD_SIZE + WORD_SIZE
PROPERTIES_START_OFFSET = 2 * DWORD_SIZE
MIN_ARRAY_SIZE = 2 * DWORD_SIZE
def __init__(self, address, mp, addr_space):
self.address = address
self.map = mp
self._parse_start(addr_space)
def _parse_start(self, addr_space):
if is_basic_array(self.map.instance_type):
self._parse_basic(addr_space)
elif self.map.instance_type == 0x424:
self._parse_424(addr_space)
else: # Inserted temporarily to make it easier to make sure what I'm currently working on works
self.data = []
def _parse_basic(self, addr_space):
parse = self._parse_one_pointer
props_start = self.address + V8Array.PROPERTIES_START_OFFSET
bonus_offset = 0
maybe_map = self._read_ptr(self.address + DWORD_SIZE, addr_space) - 1
maybe_metamap = self._read_ptr(maybe_map, addr_space)
if maybe_metamap == self.map.meta_map:
self.length = -1
self.data = ["No array"]
else:
# print("Array Address: " + str(hex(self.address)))
self.length = read_word_as_int(self.address + V8Array.LENGTH_OFFSET, addr_space)
if self.length <= 0x1000:
raw_data = addr_space.zread(props_start, self.length * DWORD_SIZE)
self.data = []
if self.map.instance_type == 81:
bonus_offset = 1 * DWORD_SIZE
for index in range(self.length):
item = parse(raw_data[index * DWORD_SIZE + bonus_offset: (index + 1) * DWORD_SIZE + bonus_offset])
self.data.append(['Property ' + str(index)] + self._parse_property(item, addr_space))
else:
self.data = ["Array too long or could not be parsed properly"]
def _parse_424(self, addr_space):
parse = self._parse_one_pointer
array1_offset = self.address + DWORD_SIZE
self.data1_addr = parse(addr_space.zread(array1_offset, DWORD_SIZE)) - 1
array1_map_ptr = parse(addr_space.zread(self.data1_addr, DWORD_SIZE)) - 1
array1_map = parse_map(array1_map_ptr, addr_space)
array1 = V8Array(self.data1_addr, array1_map, addr_space)
array2_offset = array1_offset + DWORD_SIZE
self.data2_addr = parse(addr_space.zread(array2_offset, DWORD_SIZE)) - 1
array2_map_ptr = parse(addr_space.zread(self.data2_addr, DWORD_SIZE)) - 1
array2_map = parse_map(array2_map_ptr, addr_space)
array2 = V8Array(self.data2_addr, array2_map, addr_space)
self.data = []
self.data += array1.data
self.data += array2.data
self.length = len(self.data)
def _parse_property(self, item, addr_space):
parse = self._parse_one_pointer
# print("Item: " + str(hex(item)))
if item & 0xFFFFFFFF == 0: # Smi's are always half empty
return ['smi ', item >> 32]
else:
item_map_ptr = parse(addr_space.zread(item - 1, DWORD_SIZE)) - 1
# print("Item map pointer: " + str(hex(item_map_ptr)))
if addr_space.is_valid_address(item_map_ptr) and item_map_ptr != 0:
if self.map.is_map(item_map_ptr, addr_space):
item_map = parse_map(item_map_ptr, addr_space)
if is_string(item_map.instance_type):
return ['string', item, V8String(item - 1, item_map, addr_space).data]
elif is_array(item_map.instance_type):
return ['array', item, V8Array(item - 1, item_map, addr_space).data]
elif is_object(item_map.instance_type):
return ['object', item, V8Object(item - 1, item_map, addr_space).data]
else:
return ['unknown object', str(hex(item))]
else:
return ['unknown address', str(hex(item))]
else:
return ['unknown', str(hex(item))]
def _parse_one_pointer(self, raw_double_word):
return read_double_word(raw_double_word)
def _read_ptr(self, offset, addr_space):
raw_data = addr_space.zread(offset, DWORD_SIZE)
return read_double_word(raw_data)
class V8String(object):
MAP_PTR_OFFSET = 0
STRING_LENGTH_OFFSET = 1 * DWORD_SIZE + WORD_SIZE
PROPERTIES_START_OFFSET = 2 * DWORD_SIZE
MIN_STRING_SIZE = 1 * DWORD_SIZE
def __init__(self, address, mp, addr_space):
self.address = address
self.map = mp
self._parse_start(addr_space)
def _parse_start(self, addr_space):
parse = self._parse_one_pointer
self.length = read_word_as_int(self.address + V8String.STRING_LENGTH_OFFSET, addr_space)
if self.map.instance_type == 0x8:
self._parse_8(addr_space)
elif self.map.instance_type == 0x20:
self._parse_20(addr_space)
elif self.map.instance_type == 0x28:
self._parse_28(addr_space)
elif self.map.instance_type == 0x29:
self._parse_29(addr_space)
elif self.map.instance_type == 0x2b:
self._parse_2b(addr_space)
elif self.map.instance_type == 0x2d:
self._parse_2d(addr_space)
else:
self.data = ""
def _parse_8(self, addr_space):
self.data = addr_space.zread(self.address + V8String.PROPERTIES_START_OFFSET, self.length)
def _parse_20(self, addr_space):
"""These strings are ridiculously long and contiguous, so they have a decent chance of going through
multiple pages. Unfortunately, reading through multiple pages breaks zread, so we have to only zread up to the
end of the page then do a second zread in the next page, and repeat that until we get to the end of the string"""
string = ""
curr_len = 0
while curr_len < self.length * 2:
chunk_len = min(self.length * 2 - curr_len, PAGE_SIZE - (self.address % PAGE_SIZE))
string += addr_space.zread(self.address + V8String.PROPERTIES_START_OFFSET + curr_len, chunk_len)
curr_len += chunk_len
try:
self.data = string.decode('utf_8', 'strict')
except:
self.data = ""
def _parse_28(self, addr_space):
self.data = addr_space.zread(self.address + V8String.PROPERTIES_START_OFFSET, self.length)
def _parse_29(self, addr_space): # NOT DONE. Does not work in some weird cases
parse = self._parse_one_pointer
str1_offset = self.address + V8String.PROPERTIES_START_OFFSET
self.str1_addr = parse(addr_space.zread(str1_offset, DWORD_SIZE)) - 1
self.str1_length = read_word_as_int(self.str1_addr + V8String.STRING_LENGTH_OFFSET, addr_space)
str1_map_ptr = parse(addr_space.zread(self.str1_addr, DWORD_SIZE)) - 1
str1_map = parse_map(str1_map_ptr, addr_space)
string1 = V8String(self.str1_addr, str1_map, addr_space)
self.str2_addr = parse(addr_space.zread(str1_offset + DWORD_SIZE, DWORD_SIZE)) - 1
self.str2_length = read_word_as_int(self.str2_addr + V8String.STRING_LENGTH_OFFSET, addr_space)
str2_map_ptr = parse(addr_space.zread(self.str2_addr, DWORD_SIZE)) - 1
str2_map = parse_map(str2_map_ptr, addr_space)
string2 = V8String(self.str2_addr, str2_map, addr_space)
string = string1.data + string2.data
if len(string) == self.length:
self.data = string
else:
self.data = string[0: self.length]
def _parse_2b(self, addr_space): # NOT DONE. Only works in the simplest case
parse = self._parse_one_pointer
str_offset = self.address + V8String.PROPERTIES_START_OFFSET
self.str_addr = parse(addr_space.zread(str_offset, DWORD_SIZE)) - 1
string = addr_space.zread(self.str_addr + V8String.PROPERTIES_START_OFFSET, self.length)
try:
self.data = string.decode('ascii', 'strict')
except:
self.data = ""
def _parse_2d(self, addr_space): # NOT DONE. Only works in the simplest case
parse = self._parse_one_pointer
str_offset = self.address + V8String.PROPERTIES_START_OFFSET
self.str_addr = parse(addr_space.zread(str_offset, DWORD_SIZE)) - 1
string = addr_space.zread(self.str_addr + V8String.PROPERTIES_START_OFFSET, self.length)
try:
self.data = string.decode('ascii', 'strict')
except:
self.data = ""
def _parse_one_pointer(self, raw_double_word):
return read_double_word(raw_double_word)
def _read_ptr(self, offset, addr_space):
raw_data = addr_space.zread(offset, DWORD_SIZE)
return read_double_word(raw_data)
class V8Object(object):
MAP_PTR_OFFSET = 0
OVERFLOW_ARRAY_OFFSET = 1 * DWORD_SIZE
ELEMENT_ARRAY_OFFSET = 2 * DWORD_SIZE
PROPERTIES_OFFSET = 3 * DWORD_SIZE
MIN_OBJ_SIZE = 3 * DWORD_SIZE
OVERFLOW_SIZE_OFFSET = DWORD_SIZE
OVERFLOW_PROPS_OFFSET = 2 * DWORD_SIZE
def __init__(self, address, mp, addr_space):
self.address = address
self.map = mp
self._in_obj_index = 0 # index of next in obj prop to be parsed
self._in_obj_num = mp.num_own_desc # number of props in obj, will go down as desc and overflow
self._overflow_index = 0 # index of next property in overflow ar to be parsed
self._overflow_num = 0 # number of properties in overflow array
self.slow = False
self.data = {}
self._parse_start(addr_space)
if self.slow:
return
# print "Num inobj: " + str(hex(self._in_obj_num))
# print "Num overflow: " + str(hex(self._overflow_num))
self._parse_properties(addr_space)
# print "addr: " + str(hex(self.address))
# print "map: " + str(hex(self.map.address))
# print self.data
def _get_next_property(self, addr_space):
if self._overflow_index < self._overflow_num:
offset = self.overflow_ptr + V8Object.OVERFLOW_PROPS_OFFSET + (self._overflow_index * DWORD_SIZE)
# print str(hex(offset))
self._overflow_index += 1
return self._read_ptr(offset, addr_space)
elif self._in_obj_index < self._in_obj_num:
offset = self.address + V8Object.PROPERTIES_OFFSET + (self._in_obj_index * DWORD_SIZE)
self._in_obj_index += 1
return self._read_ptr(offset, addr_space)
def _parse_properties(self, addr_space):
parse = self._parse_one_pointer
for descriptor in self.map.descriptors:
if descriptor.unknown:
self.data[descriptor.name] = descriptor.desc_value
else:
next_property = self._get_next_property(addr_space)
self.data[descriptor.name] = next_property
def _parse_start(self, addr_space):
parse = self._parse_one_pointer
data = addr_space.zread(self.address, V8Object.MIN_OBJ_SIZE)
# self.map_ptr = parse(data[V8Object.MAP_PTR_OFFSET: V8Object.MAP_PTR_OFFSET + DWORD_SIZE])
self.overflow_ptr = parse(data[V8Object.OVERFLOW_ARRAY_OFFSET: V8Object.OVERFLOW_ARRAY_OFFSET + DWORD_SIZE]) - 1
self.element_ptr = parse(data[V8Object.ELEMENT_ARRAY_OFFSET: V8Object.ELEMENT_ARRAY_OFFSET + DWORD_SIZE]) - 1
if self.overflow_ptr != self.element_ptr:
raw_dword = addr_space.zread(self.overflow_ptr + V8Object.OVERFLOW_SIZE_OFFSET, DWORD_SIZE)
overflow = read_double_word(raw_dword)
if not overflow & 0x1:
# If this is not an SMI there are slow properties in a dict
self._overflow_num = overflow >> 32
self._in_obj_num -= self._overflow_num
else:
self.slow = True
self._in_obj_num -= self.map.edge_case_descriptors
def _parse_one_pointer(self, raw_double_word):
return read_double_word(raw_double_word)
def _read_ptr(self, offset, addr_space):
raw_data = addr_space.zread(offset, DWORD_SIZE)
return read_double_word(raw_data)
class V8Descriptor(object):
def __init__(self, name, desc_value, unknown=None):
self.name = name
self.desc_value = desc_value
self.unknown = unknown
class V8Map(object):
INT1_OFFSET = 1 * DWORD_SIZE
INT2_OFFSET = INT1_OFFSET + WORD_SIZE
INT3_OFFSET = INT2_OFFSET + WORD_SIZE
NULL_INT_OFFSET = INT3_OFFSET + WORD_SIZE
METAMAP_OFFSET = 0 * DWORD_SIZE
PROTOTYPE_OFFSET = 3 * DWORD_SIZE
CTOR_OFFSET = 4 * DWORD_SIZE
DESCRIPTORS_OFFSET = 5 * DWORD_SIZE
LDESCRIPTORS_OFFSET = 6 * DWORD_SIZE
DEPENDENT_OFFSET = 7 * DWORD_SIZE
VALIDITY_OFFSET = 8 * DWORD_SIZE
TRANSITIONS_OFFSET = 9 * DWORD_SIZE
MAP_SIZE = 10 * DWORD_SIZE
DESCRIPTOR_ENTRY_SIZE = 3 * DWORD_SIZE
FIRST_DESC_ENTRY_OFFSET = 3 * DWORD_SIZE
STRING_CHAR_OFFSET = 2 * DWORD_SIZE
STRING_SIZE_OFFSET = 1 * DWORD_SIZE + WORD_SIZE
STRING_SIZE_SIZE = 1 * WORD_SIZE
SHARED_INFO_OFFSET = 3 * DWORD_SIZE
BIT_MASK = 0x1
THREE_BIT_MASK = 0x7
FIVE_BIT_MASK = 0x1F
BYTE_MASK = 0xFF
TEN_BIT_MASK = 0x3FF
SHORT_MASK = 0xFFFF
# Int Field 1
INSTANCE_SIZE_SHIFT = 0
IN_OBJ_PROP_SHIFT = 8
USED_OR_UNUSED_SHIFT = 16
VISITOR_ID_SHIFT = 24
# Int Field 2
INSTANCE_TYPE_SHIFT = 0
# Bitfield 1
NON_INST_PROT_SHIFT = 16
IS_CALLABLE_SHIFT = 17
NAMED_INTER_SHIFT = 18
INDEX_INTER_SHIFT = 19
IS_UNDETECT_SHIFT = 20
ACCESS_CHECK_SHIFT = 21
IS_CTOR_SHIFT = 22
HAS_PROTO_SLOT_SHIFT = 23
# Bitfield 2
NEW_TARGET_SHIFT = 24
IS_IMMUT_PROT_SHIFT = 25
ELEMENTS_KIND_SHIFT = 27
# Int Field 3
# Bitfield 3
ENUM_LENGTH_SHIFT = 0
NUM_OWN_DESC_SHIFT = 10
IS_PROTO_SHIFT = 20
IS_DICT_SHIFT = 21
OWNS_DESC_SHIFT = 22
IS_RETAINED_SHIFT = 23
IS_DEPRECATED_SHIFT = 24
IS_UNSTABLE_SHIFT = 25
IS_MIGRATE_TRGT_SHIFT = 26
IS_EXTENSIBLE_SHIFT = 27
INTERESTING_SYM_SHIFT = 28
CONSTRUCTED_CTR_SHIFT = 29
def __init__(self, raw_data, address, addr_space):
"""raw_data is a string of ascii read directly from memory with zread"""
# print("Parsing map at: " + str(hex(address)))
self.raw_data = raw_data
self.address = address
self.edge_case_descriptors = 0 # number of descriptors that dont have a ptr to obj