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# Detecting Emotet 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 emotetscan.py volatility/plugins/malware
# 3. python vol.py emotetconfig -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 struct import unpack, pack
from collections import OrderedDict
from socket import inet_ntoa
try:
from Crypto.Util import asn1
from Crypto.PublicKey import RSA
has_crypto = True
except ImportError:
has_crypto = False
try:
import yara
has_yara = True
except ImportError:
has_yara = False
emotet_sig = {
'namespace1' : 'rule Emotet { \
strings: \
$v4a = { BB 00 C3 4C 84 } \
$v4b = { B8 00 C3 CC 84 } \
$v5a = { 6D 4E C6 41 33 D2 81 C1 39 30 00 00 } \
$v6a = { C7 40 20 ?? ?? ?? 00 C7 40 10 ?? ?? ?? 00 C7 40 0C 00 00 00 00 83 3C CD ?? ?? ?? ?? 00 74 0E 41 89 48 ?? 83 3C CD ?? ?? ?? ?? 00 75 F2 } \
$v7a = { 6A 06 33 D2 ?? F7 ?? 8B DA 43 74 } \
$v7b = { 83 E6 0F 8B CF 83 C6 04 50 8B D6 E8 ?? ?? ?? ?? 59 6A 2F 8D 3C 77 58 66 89 07 83 C7 02 4B 75 } \
condition: all of ($v4*) or $v5a or $v6a or all of ($v7*)}'
}
# MZ Header
MZ_HEADER = b"\x4D\x5A\x90\x00"
# Config pattern
CONFIG_PATTERNS = [re.compile("(........)(\x9A\x1F|\x90\x1F|\xBB\x01|\x50\x00|\xA8\x1B|\x2F\x10|\x50\xC3|\xDE\x03|\x2F\x10|\xE3\x03|\x14\x00|\x16\x00)(......)(\x9A\x1F|\x90\x1F|\xBB\x01|\x50\x00|\xA8\x1B|\x2F\x10|\x50\xC3|\xDE\x03|\x2F\x10|\xE3\x03|\x14\x00|\x16\x00)", re.DOTALL),
re.compile("\x00\x00\x00\x00(....)(\x9A\x1F|\x90\x1F|\xBB\x01|\x50\x00|\xA8\x1B|\x2F\x10|\x50\xC3|\xDE\x03|\x2F\x10|\xE3\x03|\x14\x00|\x16\x00)(......)(\x9A\x1F|\x90\x1F|\xBB\x01|\x50\x00|\xA8\x1B|\x2F\x10|\x50\xC3|\xDE\x03|\x2F\x10|\xE3\x03|\x14\x00|\x16\x00)", re.DOTALL)]
class emotetConfig(taskmods.DllList):
"""Parse the Emotet 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 extract_rsakey(self, data):
pubkey = ""
pemkey_match = re.findall('''\x30[\x00-\xFF]{100}\x02\x03\x01\x00\x01\x00\x00''',data)
if pemkey_match:
pemkey = pemkey_match[0][0:106]
seq = asn1.DerSequence()
seq.decode(pemkey)
pemkey = RSA.construct((seq[0],seq[1]))
pubkey = pemkey.exportKey()
return pubkey
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=emotet_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 = []
p_data = OrderedDict()
for pattern in CONFIG_PATTERNS:
mc = re.search(pattern, data)
if mc:
try:
d = 4
i = 0
while 1:
ip = data[mc.start() + d + 3] + data[mc.start() + d + 2] + data[mc.start() + d + 1] + data[mc.start() + d]
port = unpack("=H", data[mc.start() + d + 4:mc.start() + d + 6])[0]
d += 8
if ip == "\x00\x00\x00\x00" and port == 0:
break
else:
p_data["IP " + str(i)] = str(inet_ntoa(ip)) + ":" + str(port)
i += 1
except:
outfd.write("[!] Not found config data.\n")
config_data.append({"RSA Public Key" : self.extract_rsakey(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("[Static IP Address list]\n")
for p_data in config_data:
for id, param in p_data.items():
outfd.write("{0}:{1}\n".format(id, param))
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