File size: 9,094 Bytes
8377638 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 | # Detecting TSCookie for Volatility
#
# LICENSE
# Please refer to the LICENSE.txt in the https://github.com/JPCERTCC/MalConfScan/
#
# How to use:
# 1. cd "Volatility Folder"
# 2. mv tscookiescan.py volatility/plugins/malware
# 3. python vol.py tscookieconfig -f images.mem --profile=Win7SP1x64
import volatility.plugins.taskmods as taskmods
import volatility.win32.tasks as tasks
import volatility.utils as utils
import volatility.debug as debug
import volatility.plugins.malware.malfind as malfind
import re
import pefile
from struct import unpack, unpack_from
from collections import OrderedDict
try:
import yara
has_yara = True
except ImportError:
has_yara = False
tscookie_sig = {
'namespace1' : 'rule TSCookie { \
strings: \
$v1 = "Mozilla/4.0 (compatible; MSIE 8.0; Win32)" wide\
$mz = { 4D 5A 90 00 } \
$b1 = { 68 D4 08 00 00 } \
condition: all of them}',
'namespace2' : 'rule TSC_Loader { \
strings: \
$v1 = "Mozilla/4.0 (compatible; MSIE 8.0; Win32)" wide\
$mz = { 4D 5A 90 00 } \
$b1 = { 68 78 0B 00 00 } \
condition: all of them}'
}
# MZ Header
MZ_HEADER = b"\x4D\x5A\x90\x00"
# Config pattern
CONFIG_PATTERNS = [re.compile("\xC3\x90\x68\x00(...)\xE8(....)\x59\x6A\x01\x58\xC3", re.DOTALL),
re.compile("\x6A\x04\x68(....)\x8D(.....)\x56\x50\xE8", re.DOTALL),
re.compile("\x00\x00\x68(....)\xE8(....)\x59\x59\x6A\x01", re.DOTALL),
re.compile("\x68(....)\xE8(....)\x59\x6A\x01\x58\xC3", re.DOTALL),
re.compile("\x68(....)\xE8(....)\x59", re.DOTALL)]
CONNECT_MODE = {0: 'TCP', 1: 'HTTP with Credentials', 2: 'HTTP with Credentials', 3: 'HTTP with Credentials',
5: 'HTTP', 6: 'HTTPS', 7: 'HTTPS', 8: 'HTTPS'}
PROXY_MODE = {0: 'Detect proxy settings', 1: 'Use config'}
INJECTION_MODE = {0 : 'Create process' , 1 : 'Injection running process'}
PROCESS_NAME = {0 : 'svchost.exe', 1 : 'iexplorer.exe', 2 : 'explorer.exe', 3 : 'Default browser' , 4: 'Setting process'}
class tscookieConfig(taskmods.DllList):
"""Parse the TSCookie configuration"""
@staticmethod
def is_valid_profile(profile):
return (profile.metadata.get('os', 'unknown') == 'windows'), profile.metadata.get('memory_model', '32bit')
def get_vad_base(self, task, address):
for vad in task.VadRoot.traverse():
if address >= vad.Start and address < vad.End:
return vad.Start, vad.End
return None
def rc4(self, data, key):
x = 0
box = range(256)
for i in range(256):
x = (x + box[i] + ord(key[i % len(key)])) % 256
box[i], box[x] = box[x], box[i]
x = 0
y = 0
out = []
for char in data:
x = (x + 1) % 256
y = (y + box[x]) % 256
box[x], box[y] = box[y], box[x]
out.append(chr(ord(char) ^ box[(box[x] + box[y]) % 256]))
return ''.join(out)
def parse_config(self, config):
p_data = OrderedDict()
for i in xrange(4):
if config[0x10 + 0x100 * i] != "\x00":
p_data["Server " + str(i)] = unpack_from("<240s", config, 0x10 + 0x100 * i)[0].replace("\0", "")
p_data["Server " + str(i) + " (port 1)"] = unpack_from("<H", config, 0x4 + 0x100 * i)[0]
p_data["Server " + str(i) + " (port 2)"] = unpack_from("<H", config, 0x8 + 0x100 * i)[0]
if config[0x400] != "\x00":
p_data["Proxy server"] = unpack_from("<128s", config, 0x400)[0].replace("\0", "")
p_data["Proxy port"] = unpack_from("<H", config, 0x480)[0]
p_data["ID"] = unpack_from("<256s", config, 0x500)[0]
p_data["KEY"] = "0x{0:X}".format(unpack_from(">I", config, 0x604)[0])
if len(config) > 0x89C:
p_data["Sleep time"] = unpack_from("<H", config, 0x89C)[0]
return p_data
def parse_loader_config(self, config):
p_data = OrderedDict()
p_data["Server name"] = unpack_from("<1024s", config, 0)[0]
p_data["KEY"] = "0x{0:X}".format(unpack_from(">I", config, 0x400)[0])
p_data["Sleep count"] = unpack_from("<H", config, 0x404)[0]
p_data["Mutex"] = unpack_from("<32s", config, 0x40c)[0]
mode = unpack_from("<H", config, 0x44c)[0]
p_data["Connect mode"] = CONNECT_MODE[mode]
p_data["Connect keep"] = unpack_from("<H", config, 0x454)[0]
icmp = unpack_from("<H", config, 0x458)[0]
if icmp == 100:
p_data["ICMP mode"] = "Enable"
p_data["ICMP bind IP"] = unpack_from("<330s", config, 0x4D4)[0]
else:
p_data["ICMP mode"] = "Disable"
injection = unpack_from("<H", config, 0x624)[0]
p_data["Injection mode"] = INJECTION_MODE[injection]
p_data["Injection process name"] = PROCESS_NAME[unpack_from("<H", config, 0x628)[0]]
p_data["Injection custom name"] = unpack_from("<256s", config, 0x62c)[0].replace("\0", "")
if config[0x72c] != "\x00":
p_data["Proxy server"] = unpack_from("<64s", config, 0x72c)[0]
p_data["Proxy port"] = unpack_from("<H", config, 0x76c)[0]
p_data["Proxy username"] = unpack_from("<64s", config, 0x770)[0]
p_data["Proxy password"] = unpack_from("<64s", config, 0x790)[0]
proxy = unpack_from("<H", config, 0x7b0)[0]
p_data["Proxy mode"] = PROXY_MODE[proxy]
p_data["AuthScheme"] = unpack_from("<H", config, 0x7b4)[0]
return p_data
def calculate(self):
if not has_yara:
debug.error("Yara must be installed for this plugin")
addr_space = utils.load_as(self._config)
os, memory_model = self.is_valid_profile(addr_space.profile)
if not os:
debug.error("This command does not support the selected profile.")
rules = yara.compile(sources=tscookie_sig)
for task in self.filter_tasks(tasks.pslist(addr_space)):
scanner = malfind.VadYaraScanner(task=task, rules=rules)
for hit, address in scanner.scan():
vad_base_addr, end = self.get_vad_base(task, address)
proc_addr_space = task.get_process_address_space()
data = proc_addr_space.zread(vad_base_addr, end - vad_base_addr)
config_data = []
dll_index = data.find(MZ_HEADER)
if dll_index:
dll_data = data[dll_index:]
dll = pefile.PE(data=dll_data)
else:
continue
if "TSCookie" in str(hit):
d = 2
else:
d = 0
for pattern in CONFIG_PATTERNS:
mc = re.search(pattern, dll_data)
if mc:
try:
(config_rva, ) = unpack("=I", dll_data[mc.start() + d + 1:mc.start() + d + 5])
config_addr = dll.get_physical_by_rva(config_rva - dll.NT_HEADERS.OPTIONAL_HEADER.ImageBase)
break
except:
print("[!] Not found config data.\n")
config_size = 0
enc = []
while not (dll_data[config_addr + config_size] == "\x00" and dll_data[config_addr + config_size + 1] == "\x00" and dll_data[config_addr + config_size + 2] == "\x00"):
enc.append(dll_data[config_addr + config_size])
config_size += 1
enc_config_data = "".join(enc)
if config_size == 0x8D4:
rc4key_length = 4
else:
rc4key_length = 0x80
try:
enc_config = enc_config_data[rc4key_length:]
rc4key = enc_config_data[:rc4key_length]
config = self.rc4(enc_config, rc4key)
if len(config) > 0:
if "TSCookie" in str(hit):
config_data.append(self.parse_config(config))
else:
config_data.append(self.parse_loader_config(config))
except:
print("[!] Not found config data.\n")
yield task, vad_base_addr, end, hit, memory_model, config_data
break
def render_text(self, outfd, data):
delim = '-' * 70
for task, start, end, malname, memory_model, config_data in data:
outfd.write("{0}\n".format(delim))
outfd.write("Process: {0} ({1})\n\n".format(task.ImageFileName, task.UniqueProcessId))
outfd.write("[Config Info]\n")
for p_data in config_data:
for id, param in p_data.items():
outfd.write("{0:<25}: {1}\n".format(id, param))
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