def decrypt_lsa_key(self, data):
logger.debug('[SECURITY] Decrypting LSA key...')
if self.lsa_secret_key_vista_type is True:
record = LSA_SECRET.from_bytes(data)
key = SECURITY.sha256_multi(self.bootkey, record.data[:32])
secret_dec = b''
cipher = AES(key)
n = 16
for block in [
record.data[32:][i:i + n]
for i in range(0, len(record.data[32:]), n)
]: #terrible, terrible workaround
if len(block) < n:
block += b'\x00' * (n - len(block))
secret_dec += cipher.decrypt(block)
record = LSA_SECRET_BLOB.from_bytes(secret_dec)
self.lsa_key = record.secret[52:][:32]
else:
ctx = hashlib.md5(self.bootkey)
for i in range(1000):
ctx.update(data[60:76])
cipher = RC4(ctx.digest())
record = cipher.decrypt(data[12:60])
self.lsa_key = record[0x10:0x20]
logger.debug('[SECURITY] LSA key value: %s' % self.lsa_key.hex())
return self.lsa_key
def basic_decrypt(cls, key, ciphertext):
assert len(ciphertext) >= 16
aes = AES(key.contents, MODE_ECB)
if len(ciphertext) == 16:
return aes.decrypt(ciphertext)
# Split the ciphertext into blocks. The last block may be partial.
cblocks = [ciphertext[p:p + 16] for p in range(0, len(ciphertext), 16)]
lastlen = len(cblocks[-1])
# CBC-decrypt all but the last two blocks.
prev_cblock = b'\x00' * 16
plaintext = b''
for b in cblocks[:-2]:
plaintext += _xorbytes(aes.decrypt(b), prev_cblock)
prev_cblock = b
# Decrypt the second-to-last cipher block. The left side of
# the decrypted block will be the final block of plaintext
# xor'd with the final partial cipher block; the right side
# will be the omitted bytes of ciphertext from the final
# block.
b = aes.decrypt(cblocks[-2])
lastplaintext = _xorbytes(b[:lastlen], cblocks[-1])
omitted = b[lastlen:]
# Decrypt the final cipher block plus the omitted bytes to get
# the second-to-last plaintext block.
plaintext += _xorbytes(aes.decrypt(cblocks[-1] + omitted), prev_cblock)
return plaintext + lastplaintext
def get_NKLM_key(self):
logger.debug('[SECURITY] Fetching NK$LM key...')
if self.lsa_key is None:
self.get_lsa_key()
value = self.hive.get_value('Policy\\Secrets\\NL$KM\\CurrVal\\default')
if value is None:
logger.error('[SECURITY] Could not find NL$KM in registry')
raise Exception('Could not find NL$KM in registry :(')
if self.lsa_secret_key_vista_type is True:
self.NKLM_key = b''
record = LSA_SECRET.from_bytes(value[1])
key = SECURITY.sha256_multi(self.lsa_key, record.data[:32])
cipher = AES(key)
n = 16
for block in [
record.data[32:][i:i + n]
for i in range(0, len(record.data[32:]), n)
]: #terrible, terrible workaround
if len(block) < n:
block += b'\x00' * (16 - len(block))
self.NKLM_key += cipher.decrypt(block)
else:
self.NKLM_key = self.decrypt_secret(self.lsa_key, value[1])
logger.debug('[SECURITY] NL$KM key: %s' % self.NKLM_key.hex())
return self.NKLM_key
def decrypt(self, encrypted): # TODO: NT version specific, move from here in subclasses. cleartext = b'' size = len(encrypted) if size: if size % 8: if not self.aes_key or not self.iv: return cleartext cipher = AES(self.aes_key, MODE_CFB, self.iv) cleartext = cipher.decrypt(encrypted) else: if not self.des_key or not self.iv: return cleartext cipher = TDES(self.des_key, MODE_CBC, self.iv[:8]) cleartext = cipher.decrypt(encrypted) return cleartext
def decrypt_hash(self, rid, hashobj, constant):
key1, key2 = SAM.rid_to_key(rid)
des1 = DES(key1)
des2 = DES(key2)
if isinstance(hashobj, SAM_HASH):
rc4key = hashlib.md5(
self.hashed_bootkey[:0x10] +
int(rid, 16).to_bytes(4, 'little', signed=False) +
constant).digest()
key = RC4(rc4key).encrypt(hashobj.hash)
else:
key = b''
cipher = AES(self.hashed_bootkey[:0x10], MODE_CBC, IV=hashobj.salt)
n = 16
for block in [
hashobj.data[i:i + n]
for i in range(0, len(hashobj.data), n)
]: #terrible, terrible workaround
key += cipher.decrypt(block)
key = key[:16]
dec_hash = des1.decrypt(key[:8]) + des2.decrypt(key[8:])
return dec_hash
def decrypt_attr(attr, key):
if attr.data is not None:
if attr.iv is not None:
cipher = AES(key, MODE_CBC, attr.iv)
else:
cipher = AES(key, MODE_CBC, b'\x00' * 16)
cleartext = cipher.decrypt(attr.data)
return cleartext
def get_secrets(self):
logger.debug('[SECURITY] get_secrets')
self.get_lsa_key()
self.dump_dcc()
# Let's first see if there are cached entries
keys = self.hive.enum_key('Policy\\Secrets')
if keys is None:
logger.debug('[SECURITY] No cached secrets found in hive')
return
if b'NL$Control' in keys:
keys.remove(b'NL$Control')
for key_name in keys:
for vl in ['CurrVal', 'OldVal']:
key_path = 'Policy\\Secrets\\{}\\{}\\default'.format(
key_name, vl)
logger.debug('[SECURITY] Parsing secrets in %s' % key_path)
v = self.hive.get_value(key_path, False)
if v and v[1] != 0:
logger.log(1,
'[SECURITY] Key %s Value %s' % (key_path, v[1]))
if self.lsa_secret_key_vista_type is True:
record = LSA_SECRET.from_bytes(v[1])
key = SECURITY.sha256_multi(self.lsa_key,
record.data[:32])
secret_dec = b''
cipher = AES(key)
n = 16
for block in [
record.data[32:][i:i + n]
for i in range(0, len(record.data[32:]), n)
]: #terrible, terrible workaround
if len(block) < n:
block += b'\x00' * (n - len(block))
secret_dec += cipher.decrypt(block)
record = LSA_SECRET_BLOB.from_bytes(secret_dec)
dec_blob = record.secret
else:
dec_blob = self.decrypt_secret(self.lsa_key, v[1])
secret = LSASecret.process(key_name, dec_blob,
vl == 'OldVal',
self.system_hive)
if secret is not None:
self.cached_secrets.append(secret)
else:
logger.debug('[SECURITY] Could not open %s, skipping!' %
key_path)
def gppassword(pw_enc_b64):
AES_KEY = b'\x4e\x99\x06\xe8\xfc\xb6\x6c\xc9\xfa\xf4\x93\x10\x62\x0f\xfe\xe8\xf4\x96\xe8\x06\xcc\x05\x79\x90\x20\x9b\x09\xa4\x33\xb6\x6c\x1b'
AES_IV = b'\x00' * 16
pad = len(pw_enc_b64) % 4
if pad == 1:
pw_enc_b64 = pw_enc_b64[:-1]
elif pad == 2 or pad == 3:
pw_enc_b64 += '=' * (4 - pad)
pw_enc = base64.b64decode(pw_enc_b64)
ctx = AES(AES_KEY, MODE_CBC, IV=AES_IV)
pw_dec = pkcs7_unpad(ctx.decrypt(pw_enc))
return pw_dec.decode('utf-16-le')
async def get_HBoot_key(self):
logger.debug('SAM parsing hashed bootkey')
QWERTY = b"!@#$%^&*()qwertyUIOPAzxcvbnmQQQQQQQQQQQQ)(*@&%\0"
DIGITS = b"0123456789012345678901234567890123456789\0"
F = await self.hive.get_value(r'SAM\Domains\Account\F')
F = F[1]
logger.log(1, '[SAM] F key value: %s' % F)
domain_properties = DOMAIN_ACCOUNT_F.from_bytes(F)
if isinstance(domain_properties.key_0, SAM_KEY_DATA):
rc4_key = hashlib.md5(domain_properties.key_0.salt + QWERTY +
self.bootkey + DIGITS).digest()
self.hashed_bootkey = RC4(rc4_key).encrypt(
domain_properties.key_0.key + domain_properties.key_0.checksum)
checksum = hashlib.md5(self.hashed_bootkey[:16] + DIGITS +
self.hashed_bootkey[:16] + QWERTY).digest()
if checksum != self.hashed_bootkey[16:]:
logger.error('[SAM] HBootkey checksum verification failed!')
raise Exception('[SAM] HBootkey checksum verification failed!')
elif isinstance(domain_properties.key_0, SAM_KEY_DATA_AES):
self.hashed_bootkey = b''
cipher = AES(self.bootkey,
MODE_CBC,
IV=domain_properties.key_0.salt)
n = 16
for block in [
domain_properties.key_0.data[i:i + n]
for i in range(0, len(domain_properties.key_0.data), n)
]: #terrible, terrible workaround
self.hashed_bootkey += cipher.decrypt(block)
logger.debug('[SAM] HBootkey: %s' % self.hashed_bootkey.hex())
return self.hashed_bootkey
def dump_dcc(self):
logger.debug('[SECURITY] dump_dcc invoked')
cache_reg = self.hive.find_key('Cache', False)
if cache_reg is None:
logger.debug('[SECURITY] No DCC secrets found')
return
values = self.hive.list_values(cache_reg)
if values == []:
logger.debug('[SECURITY] No DCC secrets found')
return
if b'NL$Control' in values:
values.remove(b'NL$Control')
if b'NL$IterationCount' in values:
logger.debug('[SECURITY] DCC Setting iteration count')
values.remove(b'NL$IterationCount')
record = self.hive.get_value('Cache\\NL$IterationCount')[1]
if record > 10240:
self.dcc_iteration_count = record & 0xfffffc00
else:
self.dcc_iteration_count = record * 1024
self.get_lsa_key()
self.get_NKLM_key()
for value in values:
logger.debug('[SECURITY] DCC Checking value: %s' % value)
record_data = self.hive.get_value('Cache\\%s' % value.decode())[1]
record = NL_RECORD.from_bytes(record_data)
if record.IV != b'\x00' * 16:
if record.Flags & 1 == 1:
# Encrypted
if self.lsa_secret_key_vista_type is True:
plaintext = b''
cipher = AES(self.NKLM_key[16:32],
MODE_CBC,
IV=record.IV)
n = 16
for block in [
record.EncryptedData[i:i + n]
for i in range(0, len(record.EncryptedData), n)
]: #terrible, terrible workaround
if len(block) < 16:
block += b'\x00' * (16 - len(block))
plaintext += cipher.decrypt(block)
else:
key = hmac.new(self.NKLM_key,
record.IV,
digestmod='md5').digest()
cipher = RC4(key)
plaintext = cipher.decrypt(record.EncryptedData)
else:
# Plain! Until we figure out what this is, we skip it
#plainText = record['EncryptedData']
logger.debug(
'[SECURITY] DCC Skipping value %s, unknown formet' %
value)
continue
dcc_hash = plaintext[:0x10]
blob = io.BytesIO(plaintext[0x48:])
username = blob.read(record.UserLength).decode('utf-16-le')
blob.seek(
self.__pad(record.UserLength) +
self.__pad(record.DomainNameLength))
domain = blob.read(
record.DnsDomainNameLength).decode('utf-16-le')
version = 2 if self.lsa_secret_key_vista_type is True else 1
secret = LSADCCSecret(version,
domain,
username,
dcc_hash,
iteration=self.dcc_iteration_count)
self.dcc_hashes.append(secret)
return self.dcc_hashes
def decrypt_all_chrome(self, dbpaths, throw=False):
from unicrypto import use_library, get_cipher_by_name
AES = get_cipher_by_name('AES', 'cryptography')
results = {}
results['logins'] = []
results['cookies'] = []
results['fmtcookies'] = []
localstate_dec = None
for username in dbpaths:
if 'localstate' in dbpaths[username]:
with open(dbpaths[username]['localstate'], 'r') as f:
encrypted_key = json.load(f)['os_crypt']['encrypted_key']
encrypted_key = base64.b64decode(encrypted_key)
try:
localstate_dec = self.decrypt_blob_bytes(encrypted_key[5:])
except:
if throw is True:
raise Exception('LocalState decryption failed!')
# this localstate was encrypted for another user...
continue
if 'cookies' in dbpaths[username]:
secrets = DPAPI.get_chrome_encrypted_secret(
dbpaths[username]['cookies'])
for host_key, name, path, encrypted_value in secrets[
'cookies']:
if encrypted_value.startswith(b'v10'):
nonce = encrypted_value[3:3 + 12]
ciphertext = encrypted_value[3 + 12:-16]
tag = encrypted_value[-16:]
cipher = AES(localstate_dec,
MODE_GCM,
IV=nonce,
segment_size=16)
dec_val = cipher.decrypt(ciphertext, b'', tag)
results['cookies'].append(
(dbpaths[username]['cookies'], host_key, name,
path, dec_val))
results['fmtcookies'].append(
DPAPI.cookieformatter('https://' + host_key, name,
path, dec_val))
else:
dec_val = self.decrypt_blob_bytes(encrypted_value)
results['cookies'].append(
(dbpaths[username]['cookies'], host_key, name,
path, dec_val))
results['fmtcookies'].append(
DPAPI.cookieformatter('https://' + host_key, name,
path, dec_val))
if 'logindata' in dbpaths[username]:
secrets = DPAPI.get_chrome_encrypted_secret(
dbpaths[username]['logindata'])
for url, user, enc_password in secrets['logins']:
if enc_password.startswith(b'v10'):
nonce = enc_password[3:3 + 12]
ciphertext = enc_password[3 + 12:-16]
tag = enc_password[-16:]
cipher = AES(localstate_dec,
MODE_GCM,
IV=nonce,
segment_size=16)
password = cipher.decrypt(ciphertext, b'', tag)
results['logins'].append(
(dbpaths[username]['logindata'], url, user,
password))
else:
password = self.decrypt_blob_bytes(enc_password)
results['logins'].append(
(dbpaths[username]['logindata'], url, user,
password))
return results
def decrypt_all_chrome(self, dbpaths):
results = {}
results['logins'] = []
results['cookies'] = []
results['fmtcookies'] = []
localstate_dec = None
for username in dbpaths:
if 'localstate' in dbpaths[username]:
with open(dbpaths[username]['localstate'], 'r') as f:
encrypted_key = json.load(f)['os_crypt']['encrypted_key']
encrypted_key = base64.b64decode(encrypted_key)
try:
localstate_dec = self.decrypt_blob_bytes(encrypted_key[5:])
except:
# this localstate was encrypted for another user...
continue
if 'cookies' in dbpaths[username]:
secrets = DPAPI.get_chrome_encrypted_secret(
dbpaths[username]['cookies'])
for host_key, name, path, encrypted_value in secrets[
'cookies']:
if encrypted_value.startswith(b'v10'):
nonce = encrypted_value[3:3 + 12]
ciphertext = encrypted_value[3 + 12:-16]
tag = encrypted_value[-16:]
cipher = AES(localstate_dec, MODE_GCM)
dec_val = cipher.decrypt(nonce,
ciphertext,
tag,
auth_data=b'')
results['cookies'].append(
(dbpaths[username]['cookies'], host_key, name,
path, dec_val))
results['fmtcookies'].append(
DPAPI.cookieformatter('https://' + host_key, name,
path, dec_val))
else:
dec_val = self.decrypt_blob_bytes(encrypted_value)
results['cookies'].append(
(dbpaths[username]['cookies'], host_key, name,
path, dec_val))
results['fmtcookies'].append(
DPAPI.cookieformatter('https://' + host_key, name,
path, dec_val))
if 'logindata' in dbpaths[username]:
secrets = DPAPI.get_chrome_encrypted_secret(
dbpaths[username]['logindata'])
for url, user, enc_password in secrets['logins']:
if enc_password.startswith(b'v10'):
nonce = enc_password[3:3 + 12]
ciphertext = enc_password[3 + 12:-16]
tag = enc_password[-16:]
cipher = AES(localstate_dec, MODE_GCM)
password = cipher.decrypt(nonce,
ciphertext,
tag,
auth_data=b'')
results['logins'].append(
(dbpaths[username]['logindata'], url, user,
password))
else:
password = self.decrypt_blob_bytes(enc_password)
results['logins'].append(
(dbpaths[username]['logindata'], url, user,
password))
return results