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# Detecting LokiBot 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 lokibotscan.py volatility/plugins/malware
# 3. python vol.py lokibotconfig -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
from base64 import b64decode
from collections import OrderedDict
try:
import yara
has_yara = True
except ImportError:
has_yara = False
try:
from Crypto.Cipher import DES3
has_crypto = True
except ImportError:
has_crypto = False
lokibot_sig = {
'namespace1' : 'rule Lokibot { \
strings: \
$des3 = { 68 03 66 00 00 } \
$param = "MAC=%02X%02X%02XINSTALL=%08X%08X" \
$string = { 2d 00 75 00 00 00 46 75 63 6b 61 76 2e 72 75 00 00} \
condition: all of them}'
}
# Config pattern
CONF_PATTERNS = [re.compile("(..)\x0F\x84(......)\xe9(....)\x90\x90\x90\x90\x90\x90", re.DOTALL)]
class lokibotConfig(taskmods.DllList):
"""Parse the Lokibot 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 string_print(self, line):
try:
return "".join((char for char in line if 32 < ord(char) < 127))
except:
return line
def config_decode(self, name, data, config_index, enc_data_count):
enc_data = []
key_data = []
enc_set = []
p_data = OrderedDict()
x = 0
for i in range(enc_data_count):
while 1:
if data[config_index + x] != "\0":
enc_set.append(data[config_index + x])
x += 1
else:
enc_data.append("".join(enc_set))
enc_set = []
x += 4
break
config_index = config_index + x
iv = data[config_index:config_index + 12].replace("\0", "")
config_index = config_index + 12
for i in range(3)[::-1]:
key_data.append(data[config_index + (12 * i):config_index + (12 * (i + 1))].replace("\0", ""))
key = "".join(key_data)
i = 0
for data in enc_data:
des = DES3.new(key, IV=iv, mode=DES3.MODE_CBC)
data_dec = des.decrypt(data)
p_data[name + " " + str(i)] = self.string_print(data_dec)
i += 1
return p_data
def calculate(self):
if not has_yara:
debug.error("Yara must be installed for this plugin")
if not has_crypto:
debug.error("pycrypto 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=lokibot_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 = []
config_index = data.find("ckav.ru") + 12
config_data.append(self.config_decode("Original URL", data, config_index, 4))
config_index = data.find("INSTALL=%08X%08X") + 16
config_data.append(self.config_decode("Registry key", data, config_index, 1))
for pattern in CONF_PATTERNS:
mk = re.search(pattern, data)
enc_set = []
x = 0
if mk:
if "h" in data[mk.start() + 0x30]:
key = 0x0
else:
key = 0xFF
while 1:
if data[mk.start() + 0x30 + x] != "\0":
enc_set.append(chr(ord(data[mk.start() + 0x30 + x]) ^ key))
x += 1
else:
enc_data = "".join(enc_set)
break
p_data = {}
p_data["Setting URL"] = self.string_print(enc_data)
config_data.append(p_data)
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:<16}: {1}\n".format(id, param))
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