/usr/lib/python2.7/dist-packages/rekall/plugins/windows/registry/hashdump.py is in python-rekall-core 1.6.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 | # Rekall Memory Forensics
# Copyright (c) 2008 Volatile Systems
# Copyright (c) 2008 Brendan Dolan-Gavitt <bdolangavitt@wesleyan.edu>
# Copyright 2013 Google Inc. All Rights Reserved.
#
# This program 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 2 of the License, or (at
# your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
"""
@author: Brendan Dolan-Gavitt
@license: GNU General Public License 2.0 or later
@contact: bdolangavitt@wesleyan.edu
http://moyix.blogspot.com/2008/02/decrypting-lsa-secrets.html
Code seems to be inspired by eyas_at_xfocus.org
http://www.xfocus.net/articles/200411/749.html
"""
import struct
from rekall import obj
from Crypto.Hash import MD5
from Crypto.Hash import MD4
from Crypto.Cipher import DES
from Crypto.Cipher import ARC4
odd_parity = [
1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
97, 97, 98, 98, 100, 100, 103, 103, 104, 104, 107, 107, 109, 109, 110, 110,
112, 112, 115, 115, 117, 117, 118, 118, 121, 121, 122, 122, 124, 124, 127, 127,
128, 128, 131, 131, 133, 133, 134, 134, 137, 137, 138, 138, 140, 140, 143, 143,
145, 145, 146, 146, 148, 148, 151, 151, 152, 152, 155, 155, 157, 157, 158, 158,
161, 161, 162, 162, 164, 164, 167, 167, 168, 168, 171, 171, 173, 173, 174, 174,
176, 176, 179, 179, 181, 181, 182, 182, 185, 185, 186, 186, 188, 188, 191, 191,
193, 193, 194, 194, 196, 196, 199, 199, 200, 200, 203, 203, 205, 205, 206, 206,
208, 208, 211, 211, 213, 213, 214, 214, 217, 217, 218, 218, 220, 220, 223, 223,
224, 224, 227, 227, 229, 229, 230, 230, 233, 233, 234, 234, 236, 236, 239, 239,
241, 241, 242, 242, 244, 244, 247, 247, 248, 248, 251, 251, 253, 253, 254, 254
]
# Permutation matrix for boot key
p = [ 0x8, 0x5, 0x4, 0x2, 0xb, 0x9, 0xd, 0x3,
0x0, 0x6, 0x1, 0xc, 0xe, 0xa, 0xf, 0x7 ]
# Constants for SAM decrypt algorithm
aqwerty = "!@#$%^&*()qwertyUIOPAzxcvbnmQQQQQQQQQQQQ)(*@&%\0"
anum = "0123456789012345678901234567890123456789\0"
antpassword = "NTPASSWORD\0"
almpassword = "LMPASSWORD\0"
lmkey = "KGS!@#$%"
empty_lm = "aad3b435b51404eeaad3b435b51404ee".decode('hex')
empty_nt = "31d6cfe0d16ae931b73c59d7e0c089c0".decode('hex')
def str_to_key(s):
key = []
key.append(ord(s[0]) >> 1)
key.append(((ord(s[0]) & 0x01) << 6) | (ord(s[1]) >> 2))
key.append(((ord(s[1]) & 0x03) << 5) | (ord(s[2]) >> 3))
key.append(((ord(s[2]) & 0x07) << 4) | (ord(s[3]) >> 4))
key.append(((ord(s[3]) & 0x0F) << 3) | (ord(s[4]) >> 5))
key.append(((ord(s[4]) & 0x1F) << 2) | (ord(s[5]) >> 6))
key.append(((ord(s[5]) & 0x3F) << 1) | (ord(s[6]) >> 7))
key.append(ord(s[6]) & 0x7F)
for i in range(8):
key[i] = (key[i] << 1)
key[i] = odd_parity[key[i]]
return "".join(chr(k) for k in key)
def sid_to_key(sid):
s1 = ""
s1 += chr(sid & 0xFF)
s1 += chr((sid >> 8) & 0xFF)
s1 += chr((sid >> 16) & 0xFF)
s1 += chr((sid >> 24) & 0xFF)
s1 += s1[0]
s1 += s1[1]
s1 += s1[2]
s2 = s1[3] + s1[0] + s1[1] + s1[2]
s2 += s2[0] + s2[1] + s2[2]
return str_to_key(s1), str_to_key(s2)
def hash_lm(pw):
pw = pw[:14].upper()
pw = pw + ('\0' * (14 - len(pw)))
d1 = DES.new(str_to_key(pw[:7]), DES.MODE_ECB)
d2 = DES.new(str_to_key(pw[7:]), DES.MODE_ECB)
return d1.encrypt(lmkey) + d2.encrypt(lmkey)
def hash_nt(pw):
return MD4.new(pw.encode('utf-16-le')).digest()
def find_control_set(sys_registry):
"""Determine which control set we are currently running with."""
csselect = sys_registry.open_key("Select")
if not csselect:
return 1
value = csselect.open_value("Current")
return value.DecodedData
def get_bootkey(sys_registry):
"""Derive the boot key by unscrambling the LSA."""
cs = find_control_set(sys_registry)
bootkey = ""
lsa_base = ["ControlSet{0:03}".format(cs), "Control", "Lsa"]
lsa_keys = ["JD", "Skew1", "GBG", "Data"]
lsa = sys_registry.open_key(lsa_base)
for lk in lsa_keys:
subkey = lsa.open_subkey(lk)
bootkey_data = subkey.Class.dereference_as("UnicodeString",
length=subkey.ClassLength)
bootkey += bootkey_data.v().decode('hex')
bootkey_scrambled = ""
for i in range(len(bootkey)):
bootkey_scrambled += bootkey[p[i]]
return bootkey_scrambled
def get_hbootkey(sam_registry, bootkey):
sam_account_path = ["SAM", "Domains", "Account"]
sam_account_key = sam_registry.open_key(sam_account_path)
# Get the F value
F = sam_account_key.open_value("F").DecodedData
if not F:
return F
md5 = MD5.new()
md5.update(F[0x70:0x80] + aqwerty + bootkey + anum)
rc4_key = md5.digest()
rc4 = ARC4.new(rc4_key)
hbootkey = rc4.encrypt(F[0x80:0xA0])
return hbootkey
def get_user_keys(sam_registry):
user_key_path = ["SAM", "Domains", "Account", "Users"]
user_key = sam_registry.open_key(user_key_path)
for k in user_key.subkeys():
if k.Name != "Names":
yield k
def decrypt_single_hash(rid, hbootkey, enc_hash, lmntstr):
(des_k1, des_k2) = sid_to_key(rid)
d1 = DES.new(des_k1, DES.MODE_ECB)
d2 = DES.new(des_k2, DES.MODE_ECB)
md5 = MD5.new()
md5.update(hbootkey[:0x10] + struct.pack("<L", rid) + lmntstr)
rc4_key = md5.digest()
rc4 = ARC4.new(rc4_key)
obfkey = rc4.encrypt(enc_hash)
hash = d1.decrypt(obfkey[:8]) + d2.decrypt(obfkey[8:])
return hash
def decrypt_hashes(rid, enc_lm_hash, enc_nt_hash, hbootkey):
# LM Hash
if enc_lm_hash:
lmhash = decrypt_single_hash(rid, hbootkey, enc_lm_hash, almpassword)
else:
lmhash = ""
# NT Hash
if enc_nt_hash:
nthash = decrypt_single_hash(rid, hbootkey, enc_nt_hash, antpassword)
else:
nthash = ""
return lmhash, nthash
def encrypt_single_hash(rid, hbootkey, hash, lmntstr):
(des_k1, des_k2) = sid_to_key(rid)
d1 = DES.new(des_k1, DES.MODE_ECB)
d2 = DES.new(des_k2, DES.MODE_ECB)
enc_hash = d1.encrypt(hash[:8]) + d2.encrypt(hash[8:])
md5 = MD5.new()
md5.update(hbootkey[:0x10] + struct.pack("<L", rid) + lmntstr)
rc4_key = md5.digest()
rc4 = ARC4.new(rc4_key)
obfkey = rc4.encrypt(enc_hash)
return obfkey
def encrypt_hashes(rid, lm_hash, nt_hash, hbootkey):
# LM Hash
if lm_hash:
enc_lmhash = encrypt_single_hash(rid, hbootkey, lm_hash, almpassword)
else:
enc_lmhash = ""
# NT Hash
if nt_hash:
enc_nthash = encrypt_single_hash(rid, hbootkey, nt_hash, antpassword)
else:
enc_nthash = ""
return enc_lmhash, enc_nthash
def get_user_hashes(user_key, hbootkey):
rid = int(str(user_key.Name), 16)
V = user_key.open_value("V").DecodedData
lm_offset = struct.unpack("<L", V[0x9c:0xa0])[0] + 0xCC + 4
lm_len = struct.unpack("<L", V[0xa0:0xa4])[0] - 4
nt_offset = struct.unpack("<L", V[0xa8:0xac])[0] + 0xCC + 4
nt_len = struct.unpack("<L", V[0xac:0xb0])[0] - 4
if lm_len:
enc_lm_hash = V[lm_offset:lm_offset + 0x10]
else:
enc_lm_hash = ""
if nt_len:
enc_nt_hash = V[nt_offset:nt_offset + 0x10]
else:
enc_nt_hash = ""
return decrypt_hashes(rid, enc_lm_hash, enc_nt_hash, hbootkey)
def get_user_name(user_key):
V = user_key.open_value("V").DecodedData
name_offset = struct.unpack("<L", V[0x0c:0x10])[0] + 0xCC
name_length = struct.unpack("<L", V[0x10:0x14])[0]
username = V[name_offset:name_offset + name_length].decode('utf-16-le')
return username
def get_user_desc(user_key):
V = user_key.open_value("V").DecodedData
desc_offset = struct.unpack("<L", V[0x24:0x28])[0] + 0xCC
desc_length = struct.unpack("<L", V[0x28:0x2c])[0]
desc = V[desc_offset:desc_offset + desc_length].decode('utf-16-le')
return desc
def dump_hashes(sys_registry, sam_registry):
bootkey = get_bootkey(sys_registry)
hbootkey = get_hbootkey(sam_registry, bootkey)
if hbootkey:
for user in get_user_keys(sam_registry):
lmhash, nthash = get_user_hashes(user, hbootkey)
if not lmhash:
lmhash = empty_lm
if not nthash:
nthash = empty_nt
yield "{0}:{1}:{2}:{3}:::".format(get_user_name(user), int(str(user.Name), 16),
lmhash.encode('hex'), nthash.encode('hex'))
else:
yield obj.NoneObject("Hbootkey is not valid")
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