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
|
# This file is part of creddump.
#
# creddump is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# creddump is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with creddump. If not, see <http://www.gnu.org/licenses/>.
"""
@author: Brendan Dolan-Gavitt
@license: GNU General Public License 2.0 or later
@contact: bdolangavitt@wesleyan.edu
"""
import hmac
import hashlib
from .rawreg import *
from ..addrspace import HiveFileAddressSpace
from .hashdump import get_bootkey
from .lsasecrets import get_secret_by_name, get_lsa_key
from struct import unpack
from foreign.client_handling.lazagne.config.crypto.pyaes.aes import AESModeOfOperationCBC
from foreign.client_handling.lazagne.config.crypto.rc4 import RC4
AES_BLOCK_SIZE = 16
def get_nlkm(secaddr, lsakey, vista):
return get_secret_by_name(secaddr, 'NL$KM', lsakey, vista)
def decrypt_hash(edata, nlkm, ch):
hmac_md5 = hmac.new(nlkm, ch, hashlib.md5)
rc4key = hmac_md5.digest()
rc4 = RC4(rc4key)
data = rc4.encrypt(edata)
return data
def decrypt_hash_vista(edata, nlkm, ch):
"""
Based on code from http://lab.mediaservice.net/code/cachedump.rb
"""
aes = AESModeOfOperationCBC(nlkm[16:32], iv=ch)
out = ""
for i in range(0, len(edata), 16):
buf = edata[i:i+16]
if len(buf) < 16:
buf += (16 - len(buf)) * "\00"
out += b"".join([aes.decrypt(buf[i:i + AES_BLOCK_SIZE]) for i in range(0, len(buf), AES_BLOCK_SIZE)])
return out
def parse_cache_entry(cache_data):
(uname_len, domain_len) = unpack("<HH", cache_data[:4])
(domain_name_len,) = unpack("<H", cache_data[60:62])
ch = cache_data[64:80]
enc_data = cache_data[96:]
return uname_len, domain_len, domain_name_len, enc_data, ch
def parse_decrypted_cache(dec_data, uname_len, domain_len, domain_name_len):
uname_off = 72
pad = 2 * ((uname_len / 2) % 2)
domain_off = uname_off + uname_len + pad
pad = 2 * ((domain_len / 2) % 2)
domain_name_off = domain_off + domain_len + pad
data_hash = dec_data[:0x10]
username = dec_data[uname_off:uname_off+uname_len]
username = username.decode('utf-16-le', errors='ignore')
domain = dec_data[domain_off:domain_off+domain_len]
domain = domain.decode('utf-16-le', errors='ignore')
domain_name = dec_data[domain_name_off:domain_name_off+domain_name_len]
domain_name = domain_name.decode('utf-16-le', errors='ignore')
return username, domain, domain_name, data_hash
def dump_hashes(sysaddr, secaddr, vista):
bootkey = get_bootkey(sysaddr)
if not bootkey:
return []
lsakey = get_lsa_key(secaddr, bootkey, vista)
if not lsakey:
return []
nlkm = get_nlkm(secaddr, lsakey, vista)
if not nlkm:
return []
root = get_root(secaddr)
if not root:
return []
cache = open_key(root, ["Cache"])
if not cache:
return []
hashes = []
for v in values(cache):
if v.Name == "NL$Control":
continue
data = v.space.read(v.Data.value, v.DataLength.value)
(uname_len, domain_len, domain_name_len, enc_data, ch) = parse_cache_entry(data)
# Skip if nothing in this cache entry
if uname_len == 0:
continue
if vista:
dec_data = decrypt_hash_vista(enc_data, nlkm, ch)
else:
dec_data = decrypt_hash(enc_data, nlkm, ch)
(username, domain, domain_name, hash) = parse_decrypted_cache(dec_data, uname_len, domain_len, domain_name_len)
hashes.append((username, domain, domain_name, hash))
return hashes
def dump_file_hashes(syshive_fname, sechive_fname, vista):
sysaddr = HiveFileAddressSpace(syshive_fname)
secaddr = HiveFileAddressSpace(sechive_fname)
results = []
for (u, d, dn, hash) in dump_hashes(sysaddr, secaddr, vista):
results.append("%s:%s:%s:%s" % (u.lower(), hash.encode('hex'), d.lower(), dn.lower()))
return results
|