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support multiple PEKs in Windows 2016 #618

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Apr 28, 2019
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support multiple PEKs in Windows 2016 #618

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17 changes: 15 additions & 2 deletions impacket/examples/secretsdump.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1888,8 +1888,21 @@ def __getPek(self):
decryptedPekList = self.PEKLIST_PLAIN(
self.__cryptoCommon.decryptAES(self.__bootKey, encryptedPekList['EncryptedPek'],
encryptedPekList['KeyMaterial']))
self.__PEK.append(decryptedPekList['DecryptedPek'][4:][:16])
LOG.info("PEK # 0 found and decrypted: %s", hexlify(decryptedPekList['DecryptedPek'][4:][:16]).decode('utf-8'))

# PEK list entries take the form:
# index (4 byte LE int), PEK (16 byte key)
# the entries are in ascending order, and the list is terminated
# by an entry with a non-sequential index (08080808 observed)
pos, cur_index = 0, 0
while True:
pek_entry = decryptedPekList['DecryptedPek'][pos:pos+20]
if len(pek_entry) < 20: break # if list truncated, should not happen
index, pek = unpack('<L16s', pek_entry)
if index != cur_index: break # break on non-sequential index
self.__PEK.append(pek)
LOG.info("PEK # %d found and decrypted: %s", index, hexlify(pek).decode('utf-8'))
cur_index += 1
pos += 20

def __removeRC4Layer(self, cryptedHash):
md5 = hashlib.new('md5')
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