File size: 5,959 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 |
# Detecting AgentTesla Keylogger 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 agentteslascan.py volatility/plugins/malware
# 3. python vol.py agentteslaconfig -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 AES
has_crypto = True
except ImportError:
has_crypto = False
agenttesla_sig = {
'namespace1' : 'rule Agenttesla_type1 { \
strings: \
$type1ie = "C:\\\\Users\\\\Admin\\\\Desktop\\\\IELibrary\\\\IELibrary\\\\obj\\\\Debug\\\\IELibrary.pdb" \
$type1at = "C:\\\\Users\\\\Admin\\\\Desktop\\\\ConsoleApp1\\\\ConsoleApp1\\\\obj\\\\Debug\\\\ConsoleApp1.pdb" \
$type1sql = "Not a valid SQLite 3 Database File" wide \
condition: all of them}',
'namespace2' : 'rule Agenttesla_type2 { \
strings: \
$type2db1 = "1.85 (Hash, version 2, native byte-order)" wide \
$type2db2 = "Unknow database format" wide \
$type2db3 = "SQLite format 3" wide \
$type2db4 = "Berkelet DB" wide \
condition: (uint16(0) == 0x5A4D) and 3 of them}'
}
# IV
IV = "@1B2c3D4e5F6g7H8"
# AES Key
KEY = "\x34\x88\x6D\x5B\x09\x7A\x94\x19\x78\xD0\xE3\x8b\x1b\x5c\xa3\x29\x60\x74\x6a\x5e\x5d\x64\x87\x11\xb1\x2c\x67\xaa\x5b\x3a\x8e\xbf"
class agentteslaConfig(taskmods.DllList):
"""Parse the Agenttesla 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 base64strings(self, data, n=18):
for match in re.finditer(("(([0-9a-z-A-Z\+/]\x00){%s}([0-9a-z-A-Z\+/]\x00)*(=\x00){0,2})" % n).encode(), data):
yield match.group(0)
def remove_unascii(self, b):
cleaned = ""
for i in b:
if ord(i) >= 0x20 and ord(i) < 0x7f:
cleaned += i
return cleaned
def stringdecrypt_type1(self, a):
string = b64decode(a)
cleartext = AES.new(KEY[0:32], AES.MODE_CBC, IV).decrypt(string)
return cleartext
def stringdecrypt_type2(self, data):
encdata = data[0x2050:]
dlist = OrderedDict()
offset = 0
num = 0
i = 16
while True:
key = encdata[offset:offset + 32]
iv = encdata[offset + 32:offset + 48]
enc_data =encdata[offset + 48:offset + 48 + i]
if b"\x00\x00" in key and b"\x00\x00" in iv:
break
try:
cleartext = AES.new(key, AES.MODE_CBC, iv).decrypt(enc_data)
if len(cleartext) and (ord(cleartext[-1]) <= 0x10 or self.remove_unascii(cleartext) % 16 == 0) and not (ord(cleartext[-2]) == 0x0d and ord(cleartext[-1]) == 0x0a):
dlist["Encoded string " + str(num)] = self.remove_unascii(cleartext).rstrip()
offset = offset + 48 + i
num += 1
i = 0
else:
i += 16
except:
i += 16
return dlist
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=agenttesla_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 = []
dlist = OrderedDict()
if "type1" in str(hit):
for word in self.base64strings(data):
try:
dec = self.stringdecrypt_type1(word)
dec = self.remove_unascii(dec).rstrip()
dlist[word.strip().replace('\0', '')] = dec
except:
pass
if "type2" in str(hit):
dlist = self.stringdecrypt_type2(data)
config_data.append(dlist)
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))
|