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cs-decrypt-metadata.py
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cs-decrypt-metadata.py
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#!/usr/bin/env python
from __future__ import print_function
__description__ = 'Cobalt Strike: RSA decrypt metadata'
__author__ = 'Didier Stevens'
__version__ = '0.0.3'
__date__ = '2021/11/15'
"""
Source code put in the public domain by Didier Stevens, no Copyright
https://DidierStevens.com
Use at your own risk
History:
2021/10/10: start
2021/10/20: refactoring
2021/10/26: 0.0.2 parsing binary IPv4 address
2021/11/10: error handling decrypting; added option -t
2021/11/11: 0.0.3 refactoring: cCSInstructions, cOutput
2021/11/15: bugfix decoding
Todo:
"""
import binascii
import struct
import hashlib
import re
import optparse
import os
import sys
import json
import textwrap
import base64
import time
try:
import Crypto.PublicKey.RSA
import Crypto.Cipher.PKCS1_v1_5
except ImportError:
print('pycrypto module is required: pip install pycryptodome')
exit(-1)
try:
import javaobj
except ImportError:
javaobj = None
def PrintManual():
manual = r'''
Manual:
This tool decrypts metadata sent by a Cobalt Strike beacon to its team server.
Provide the metadata in base64 format as argument. More than one argument can be provided.
Decrypting metadata requires a private key.
A private key can be provided with option -p in hexadecimal format or with option -f as a file (.cobaltstrike.beacon_keys).
If no private key is provided, all private keys in file 1768.json are tried.
Example:
cs-decrypt-metadata.py KN9zfIq31DBBdLtF4JUjmrhm0lRKkC/I/zAiJ+Xxjz787h9yh35cRjEnXJAwQcWP4chXobXT/E5YrZjgreeGTrORnj//A5iZw2TClEnt++gLMyMHwgjsnvg9czGx6Ekpz0L1uEfkVoo4MpQ0/kJk9myZagRrPrFWdE9U7BwCzlE=
Input: KN9zfIq31DBBdLtF4JUjmrhm0lRKkC/I/zAiJ+Xxjz787h9yh35cRjEnXJAwQcWP4chXobXT/E5YrZjgreeGTrORnj//A5iZw2TClEnt++gLMyMHwgjsnvg9czGx6Ekpz0L1uEfkVoo4MpQ0/kJk9myZagRrPrFWdE9U7BwCzlE=
Encrypted metadata: 28df737c8ab7d4304174bb45e095239ab866d2544a902fc8ff302227e5f18f3efcee1f72877e5c4631275c903041c58fe1c857a1b5d3fc4e58ad98e0ade7864eb3919e3fff039899c364c29449edfbe80b332307c208ec9ef83d7331b1e84929cf42f5b847e4568a38329434fe4264f66c996a046b3eb156744f54ec1c02ce51
Decrypted:
Header: 0000beef
Datasize: 0000005d
Raw key: caeab4f452fe41182d504aa24966fbd0
aeskey: 3342f45e6e2f71f5975c998600b11471
hmackey: 7142dd70f4ec320badac8ca246a9488f
charset: 04e4 ANSI Latin 1; Western European (Windows)
charset_oem: 01b5 OEM United States
bid: 644d8e4 105175268
pid: 1c7c 7292
port: 0
flags: 04
var1: 10
var2: 0
var3: 19042
var4: 0
var5: 1988364896
var6: 1988359504
Internal IPv4: 10.6.9.111
Field: b'DESKTOP-Q21RU7A'
Field: b'maxwell.carter'
Field: b'svchost.exe'
By default, metadata is BASE64 encoded. If another transformation is used by the beacon to encode the metadata, option -t can be used to transform the metadata prior to decrypting.
Example:
cs-decrypt-metadata.py -t 7:Metadata,13,2:__cfduid=,6:Cookie __cfduid=GQ-rUvFDD0WewXldmHhCkZybJ5OB4ZrwbRbN6K4St2Jr7W1L0FR0eSZSdHtt0i9JHBBUzRnQj1U4a0a4meC9YMvgvdSIQ4QlqNEw5GMDKkTYjAcNRRCe3QYZ2FeW4dn5SALu70Eb7F5VzDoFcG_Hq3akmQpHH-RBWPYNxTX2fsE
'''
for line in manual.split('\n'):
print(textwrap.fill(line, 79))
DEFAULT_SEPARATOR = ','
QUOTE = '"'
def IfWIN32SetBinary(io):
if sys.platform == 'win32':
import msvcrt
msvcrt.setmode(io.fileno(), os.O_BINARY)
#Fix for http://bugs.python.org/issue11395
def StdoutWriteChunked(data):
if sys.version_info[0] > 2:
if isinstance(data, str):
sys.stdout.write(data)
else:
sys.stdout.buffer.write(data)
else:
while data != '':
sys.stdout.write(data[0:10000])
try:
sys.stdout.flush()
except IOError:
return
data = data[10000:]
class cVariables():
def __init__(self, variablesstring='', separator=DEFAULT_SEPARATOR):
self.dVariables = {}
if variablesstring == '':
return
for variable in variablesstring.split(separator):
name, value = VariableNameValue(variable)
self.dVariables[name] = value
def SetVariable(self, name, value):
self.dVariables[name] = value
def Instantiate(self, astring):
for key, value in self.dVariables.items():
astring = astring.replace('%' + key + '%', value)
return astring
class cOutput():
def __init__(self, filenameOption=None, binary=False):
self.starttime = time.time()
self.filenameOption = filenameOption
self.separateFiles = False
self.progress = False
self.console = False
self.head = False
self.headCounter = 0
self.tail = False
self.tailQueue = []
self.STDOUT = 'STDOUT'
self.fOut = None
self.oCsvWriter = None
self.rootFilenames = {}
self.binary = binary
if self.binary:
self.fileoptions = 'wb'
else:
self.fileoptions = 'w'
self.dReplacements = {}
def Replace(self, line):
for key, value in self.dReplacements.items():
line = line.replace(key, value)
return line
def Open(self, binary=False):
if self.fOut != None:
return
if binary:
self.fileoptions = 'wb'
else:
self.fileoptions = 'w'
if self.filenameOption:
if self.ParseHash(self.filenameOption):
if not self.separateFiles and self.filename != '':
self.fOut = open(self.filename, self.fileoptions)
elif self.filenameOption != '':
self.fOut = open(self.filenameOption, self.fileoptions)
else:
self.fOut = self.STDOUT
def ParseHash(self, option):
if option.startswith('#'):
position = self.filenameOption.find('#', 1)
if position > 1:
switches = self.filenameOption[1:position]
self.filename = self.filenameOption[position + 1:]
for switch in switches:
if switch == 's':
self.separateFiles = True
elif switch == 'p':
self.progress = True
elif switch == 'c':
self.console = True
elif switch == 'l':
pass
elif switch == 'g':
if self.filename != '':
extra = self.filename + '-'
else:
extra = ''
self.filename = '%s-%s%s.txt' % (os.path.splitext(os.path.basename(sys.argv[0]))[0], extra, self.FormatTime())
elif switch == 'h':
self.head = True
elif switch == 't':
self.tail = True
else:
return False
return True
return False
@staticmethod
def FormatTime(epoch=None):
if epoch == None:
epoch = time.time()
return '%04d%02d%02d-%02d%02d%02d' % time.localtime(epoch)[0:6]
def RootUnique(self, root):
if not root in self.rootFilenames:
self.rootFilenames[root] = None
return root
iter = 1
while True:
newroot = '%s_%04d' % (root, iter)
if not newroot in self.rootFilenames:
self.rootFilenames[newroot] = None
return newroot
iter += 1
def LineSub(self, line, eol):
line = self.Replace(line)
self.Open()
if self.fOut == self.STDOUT or self.console:
try:
print(line, end=eol)
except UnicodeEncodeError:
encoding = sys.stdout.encoding
print(line.encode(encoding, errors='backslashreplace').decode(encoding), end=eol)
# sys.stdout.flush()
if self.fOut != self.STDOUT:
self.fOut.write(line + '\n')
self.fOut.flush()
def Line(self, line, eol='\n'):
if self.head:
if self.headCounter < 10:
self.LineSub(line, eol)
elif self.tail:
self.tailQueue = self.tailQueue[-9:] + [[line, eol]]
self.headCounter += 1
elif self.tail:
self.tailQueue = self.tailQueue[-9:] + [[line, eol]]
else:
self.LineSub(line, eol)
def LineTimestamped(self, line):
self.Line('%s: %s' % (self.FormatTime(), line))
def WriteBinary(self, data):
self.Open(True)
if self.fOut != self.STDOUT:
self.fOut.write(data)
self.fOut.flush()
else:
IfWIN32SetBinary(sys.stdout)
StdoutWriteChunked(data)
def CSVWriteRow(self, row):
if self.oCsvWriter == None:
self.StringIOCSV = StringIO()
# self.oCsvWriter = csv.writer(self.fOut)
self.oCsvWriter = csv.writer(self.StringIOCSV)
self.oCsvWriter.writerow(row)
self.Line(self.StringIOCSV.getvalue(), '')
self.StringIOCSV.truncate(0)
self.StringIOCSV.seek(0)
def Filename(self, filename, index, total):
self.separateFilename = filename
if self.progress:
if index == 0:
eta = ''
else:
seconds = int(float((time.time() - self.starttime) / float(index)) * float(total - index))
eta = 'estimation %d seconds left, finished %s ' % (seconds, self.FormatTime(time.time() + seconds))
PrintError('%d/%d %s%s' % (index + 1, total, eta, self.separateFilename))
if self.separateFiles and self.filename != '':
oFilenameVariables = cVariables()
oFilenameVariables.SetVariable('f', self.separateFilename)
basename = os.path.basename(self.separateFilename)
oFilenameVariables.SetVariable('b', basename)
oFilenameVariables.SetVariable('d', os.path.dirname(self.separateFilename))
root, extension = os.path.splitext(basename)
oFilenameVariables.SetVariable('r', root)
oFilenameVariables.SetVariable('ru', self.RootUnique(root))
oFilenameVariables.SetVariable('e', extension)
self.Close()
self.fOut = open(oFilenameVariables.Instantiate(self.filename), self.fileoptions)
def Close(self):
if self.head and self.tail and len(self.tailQueue) > 0:
self.LineSub('...', '\n')
for line, eol in self.tailQueue:
self.LineSub(line, eol)
self.headCounter = 0
self.tailQueue = []
if self.fOut != self.STDOUT:
self.fOut.close()
self.fOut = None
def InstantiateCOutput(options):
filenameOption = None
if options.output != '':
filenameOption = options.output
return cOutput(filenameOption)
def RSAEncrypt(key, data):
oPublicKey = Crypto.PublicKey.RSA.importKey(binascii.a2b_hex(key).rstrip(b'\x00'))
oRSAPublicKey = Crypto.Cipher.PKCS1_v1_5.new(oPublicKey)
ciphertext = oRSAPublicKey.encrypt(data)
ciphertextBASE64 = binascii.b2a_base64(ciphertext).rstrip(b'\n')
return ciphertextBASE64
def RSADecrypt(key, data):
oPrivateKey = Crypto.PublicKey.RSA.importKey(binascii.a2b_hex(key))
oRSAPrivateKey = Crypto.Cipher.PKCS1_v1_5.new(oPrivateKey)
ciphertext = data
try:
cleartext = oRSAPrivateKey.decrypt(ciphertext, None)
except ValueError:
return None
return cleartext
class cStruct(object):
def __init__(self, data):
self.data = data
self.originaldata = data
def Unpack(self, format):
formatsize = struct.calcsize(format)
if len(self.data) < formatsize:
raise Exception('Not enough data')
tounpack = self.data[:formatsize]
self.data = self.data[formatsize:]
return struct.unpack(format, tounpack)
def Truncate(self, length):
self.data = self.data[:length]
def GetBytes(self, length=None, peek=False):
if length == None:
length = len(self.data)
result = self.data[:length]
if not peek:
self.data = self.data[length:]
return result
#https://msdn.microsoft.com/en-us/library/windows/desktop/dd317756%28v=vs.85%29.aspx
dCodepages = {
37: 'IBM EBCDIC US-Canada',
437: 'OEM United States',
500: 'IBM EBCDIC International',
708: 'Arabic (ASMO 708)',
709: 'Arabic (ASMO-449+, BCON V4)',
710: 'Arabic - Transparent Arabic',
720: 'Arabic (Transparent ASMO); Arabic (DOS)',
737: 'OEM Greek (formerly 437G); Greek (DOS)',
775: 'OEM Baltic; Baltic (DOS)',
850: 'OEM Multilingual Latin 1; Western European (DOS)',
852: 'OEM Latin 2; Central European (DOS)',
855: 'OEM Cyrillic (primarily Russian)',
857: 'OEM Turkish; Turkish (DOS)',
858: 'OEM Multilingual Latin 1 + Euro symbol',
860: 'OEM Portuguese; Portuguese (DOS)',
861: 'OEM Icelandic; Icelandic (DOS)',
862: 'OEM Hebrew; Hebrew (DOS)',
863: 'OEM French Canadian; French Canadian (DOS)',
864: 'OEM Arabic; Arabic (864)',
865: 'OEM Nordic; Nordic (DOS)',
866: 'OEM Russian; Cyrillic (DOS)',
869: 'OEM Modern Greek; Greek, Modern (DOS)',
870: 'IBM EBCDIC Multilingual/ROECE (Latin 2); IBM EBCDIC Multilingual Latin 2',
874: 'ANSI/OEM Thai (ISO 8859-11); Thai (Windows)',
875: 'IBM EBCDIC Greek Modern',
932: 'ANSI/OEM Japanese; Japanese (Shift-JIS)',
936: 'ANSI/OEM Simplified Chinese (PRC, Singapore); Chinese Simplified (GB2312)',
949: 'ANSI/OEM Korean (Unified Hangul Code)',
950: 'ANSI/OEM Traditional Chinese (Taiwan; Hong Kong SAR, PRC); Chinese Traditional (Big5)',
1026: 'IBM EBCDIC Turkish (Latin 5)',
1047: 'IBM EBCDIC Latin 1/Open System',
1140: 'IBM EBCDIC US-Canada (037 + Euro symbol); IBM EBCDIC (US-Canada-Euro)',
1141: 'IBM EBCDIC Germany (20273 + Euro symbol); IBM EBCDIC (Germany-Euro)',
1142: 'IBM EBCDIC Denmark-Norway (20277 + Euro symbol); IBM EBCDIC (Denmark-Norway-Euro)',
1143: 'IBM EBCDIC Finland-Sweden (20278 + Euro symbol); IBM EBCDIC (Finland-Sweden-Euro)',
1144: 'IBM EBCDIC Italy (20280 + Euro symbol); IBM EBCDIC (Italy-Euro)',
1145: 'IBM EBCDIC Latin America-Spain (20284 + Euro symbol); IBM EBCDIC (Spain-Euro)',
1146: 'IBM EBCDIC United Kingdom (20285 + Euro symbol); IBM EBCDIC (UK-Euro)',
1147: 'IBM EBCDIC France (20297 + Euro symbol); IBM EBCDIC (France-Euro)',
1148: 'IBM EBCDIC International (500 + Euro symbol); IBM EBCDIC (International-Euro)',
1149: 'IBM EBCDIC Icelandic (20871 + Euro symbol); IBM EBCDIC (Icelandic-Euro)',
1200: 'Unicode UTF-16, little endian byte order (BMP of ISO 10646); available only to managed applications',
1201: 'Unicode UTF-16, big endian byte order; available only to managed applications',
1250: 'ANSI Central European; Central European (Windows)',
1251: 'ANSI Cyrillic; Cyrillic (Windows)',
1252: 'ANSI Latin 1; Western European (Windows)',
1253: 'ANSI Greek; Greek (Windows)',
1254: 'ANSI Turkish; Turkish (Windows)',
1255: 'ANSI Hebrew; Hebrew (Windows)',
1256: 'ANSI Arabic; Arabic (Windows)',
1257: 'ANSI Baltic; Baltic (Windows)',
1258: 'ANSI/OEM Vietnamese; Vietnamese (Windows)',
1361: 'Korean (Johab)',
10000: 'MAC Roman; Western European (Mac)',
10001: 'Japanese (Mac)',
10002: 'MAC Traditional Chinese (Big5); Chinese Traditional (Mac)',
10003: 'Korean (Mac)',
10004: 'Arabic (Mac)',
10005: 'Hebrew (Mac)',
10006: 'Greek (Mac)',
10007: 'Cyrillic (Mac)',
10008: 'MAC Simplified Chinese (GB 2312); Chinese Simplified (Mac)',
10010: 'Romanian (Mac)',
10017: 'Ukrainian (Mac)',
10021: 'Thai (Mac)',
10029: 'MAC Latin 2; Central European (Mac)',
10079: 'Icelandic (Mac)',
10081: 'Turkish (Mac)',
10082: 'Croatian (Mac)',
12000: 'Unicode UTF-32, little endian byte order; available only to managed applications',
12001: 'Unicode UTF-32, big endian byte order; available only to managed applications',
20000: 'CNS Taiwan; Chinese Traditional (CNS)',
20001: 'TCA Taiwan',
20002: 'Eten Taiwan; Chinese Traditional (Eten)',
20003: 'IBM5550 Taiwan',
20004: 'TeleText Taiwan',
20005: 'Wang Taiwan',
20105: 'IA5 (IRV International Alphabet No. 5, 7-bit); Western European (IA5)',
20106: 'IA5 German (7-bit)',
20107: 'IA5 Swedish (7-bit)',
20108: 'IA5 Norwegian (7-bit)',
20127: 'US-ASCII (7-bit)',
20261: 'T.61',
20269: 'ISO 6937 Non-Spacing Accent',
20273: 'IBM EBCDIC Germany',
20277: 'IBM EBCDIC Denmark-Norway',
20278: 'IBM EBCDIC Finland-Sweden',
20280: 'IBM EBCDIC Italy',
20284: 'IBM EBCDIC Latin America-Spain',
20285: 'IBM EBCDIC United Kingdom',
20290: 'IBM EBCDIC Japanese Katakana Extended',
20297: 'IBM EBCDIC France',
20420: 'IBM EBCDIC Arabic',
20423: 'IBM EBCDIC Greek',
20424: 'IBM EBCDIC Hebrew',
20833: 'IBM EBCDIC Korean Extended',
20838: 'IBM EBCDIC Thai',
20866: 'Russian (KOI8-R); Cyrillic (KOI8-R)',
20871: 'IBM EBCDIC Icelandic',
20880: 'IBM EBCDIC Cyrillic Russian',
20905: 'IBM EBCDIC Turkish',
20924: 'IBM EBCDIC Latin 1/Open System (1047 + Euro symbol)',
20932: 'Japanese (JIS 0208-1990 and 0212-1990)',
20936: 'Simplified Chinese (GB2312); Chinese Simplified (GB2312-80)',
20949: 'Korean Wansung',
21025: 'IBM EBCDIC Cyrillic Serbian-Bulgarian',
21027: '(deprecated)',
21866: 'Ukrainian (KOI8-U); Cyrillic (KOI8-U)',
28591: 'ISO 8859-1 Latin 1; Western European (ISO)',
28592: 'ISO 8859-2 Central European; Central European (ISO)',
28593: 'ISO 8859-3 Latin 3',
28594: 'ISO 8859-4 Baltic',
28595: 'ISO 8859-5 Cyrillic',
28596: 'ISO 8859-6 Arabic',
28597: 'ISO 8859-7 Greek',
28598: 'ISO 8859-8 Hebrew; Hebrew (ISO-Visual)',
28599: 'ISO 8859-9 Turkish',
28603: 'ISO 8859-13 Estonian',
28605: 'ISO 8859-15 Latin 9',
29001: 'Europa 3',
38598: 'ISO 8859-8 Hebrew; Hebrew (ISO-Logical)',
50220: 'ISO 2022 Japanese with no halfwidth Katakana; Japanese (JIS)',
50221: 'ISO 2022 Japanese with halfwidth Katakana; Japanese (JIS-Allow 1 byte Kana)',
50222: 'ISO 2022 Japanese JIS X 0201-1989; Japanese (JIS-Allow 1 byte Kana - SO/SI)',
50225: 'ISO 2022 Korean',
50227: 'ISO 2022 Simplified Chinese; Chinese Simplified (ISO 2022)',
50229: 'ISO 2022 Traditional Chinese',
50930: 'EBCDIC Japanese (Katakana) Extended',
50931: 'EBCDIC US-Canada and Japanese',
50933: 'EBCDIC Korean Extended and Korean',
50935: 'EBCDIC Simplified Chinese Extended and Simplified Chinese',
50936: 'EBCDIC Simplified Chinese',
50937: 'EBCDIC US-Canada and Traditional Chinese',
50939: 'EBCDIC Japanese (Latin) Extended and Japanese',
51932: 'EUC Japanese',
51936: 'EUC Simplified Chinese; Chinese Simplified (EUC)',
51949: 'EUC Korean',
51950: 'EUC Traditional Chinese',
52936: 'HZ-GB2312 Simplified Chinese; Chinese Simplified (HZ)',
54936: 'Windows XP and later: GB18030 Simplified Chinese (4 byte); Chinese Simplified (GB18030)',
57002: 'ISCII Devanagari',
57003: 'ISCII Bengali',
57004: 'ISCII Tamil',
57005: 'ISCII Telugu',
57006: 'ISCII Assamese',
57007: 'ISCII Oriya',
57008: 'ISCII Kannada',
57009: 'ISCII Malayalam',
57010: 'ISCII Gujarati',
57011: 'ISCII Punjabi',
65000: 'Unicode (UTF-7)',
65001: 'Unicode (UTF-8)'
}
def DecodeMetadata(decrypted, oOutput):
oStruct = cStruct(decrypted)
beef = oStruct.Unpack('>I')[0]
oOutput.Line('Decrypted:')
oOutput.Line('Header: %08x' % beef)
datasize = oStruct.Unpack('>I')[0]
oOutput.Line('Datasize: %08x' % datasize)
oStruct.Truncate(datasize)
rawkey = oStruct.GetBytes(16)
oOutput.Line('Raw key: %s' % binascii.b2a_hex(rawkey).decode())
sha256hex = hashlib.sha256(rawkey).hexdigest()
aeskey = sha256hex[:32]
hmackey = sha256hex[32:]
oOutput.Line(' aeskey: %s' % aeskey)
oOutput.Line(' hmackey: %s' % hmackey)
charset, charset_oem = oStruct.Unpack('<HH')
oOutput.Line('charset: %04x %s' % (charset, dCodepages.get(charset, '')))
oOutput.Line('charset_oem: %04x %s' % (charset_oem, dCodepages.get(charset_oem, '')))
peek = oStruct.GetBytes(peek=True)
if not re.match(b'[0-9]+\t[0-9]+\t[0-9]', peek):
bid, pid, port, flags = oStruct.Unpack('>IIHB')
oOutput.Line('bid: %04x %d' % (bid, bid))
oOutput.Line('pid: %04x %d' % (pid, pid))
oOutput.Line('port: %d' % port)
oOutput.Line('flags: %02x' % flags)
peek = oStruct.GetBytes(peek=True)
if not re.match(b'[0-9]+\.[0-9]+\t[0-9]+', peek):
var1, var2, var3, var4, var5, var6 = oStruct.Unpack('>BBHIII')
oOutput.Line('var1: %d' % var1)
oOutput.Line('var2: %d' % var2)
oOutput.Line('var3: %d' % var3)
oOutput.Line('var4: %d' % var4)
oOutput.Line('var5: %d' % var5)
oOutput.Line('var6: %d' % var6)
ipv4 = oStruct.GetBytes(4)
oOutput.Line('Internal IPv4: %s' % '.'.join([str(byte) for byte in ipv4[::-1]]))
remainder = oStruct.GetBytes()
for field in remainder.split(b'\t'):
oOutput.Line('Field: %s' % field)
oOutput.Line('')
def GetScriptPath():
if getattr(sys, 'frozen', False):
return os.path.dirname(sys.executable)
else:
return os.path.dirname(sys.argv[0])
def GetJSONData():
filename = os.path.join(GetScriptPath(), '1768.json')
if not os.path.isfile(filename):
return {}
return json.load(open(filename, 'r'))
class cCSInstructions(object):
CS_INSTRUCTION_TYPE_INPUT = 'Input'
CS_INSTRUCTION_TYPE_OUTPUT = 'Output'
CS_INSTRUCTION_TYPE_METADATA = 'Metadata'
CS_INSTRUCTION_TYPE_SESSIONID = 'SessionId'
CS_INSTRUCTION_NONE = 0
CS_INSTRUCTION_APPEND = 1
CS_INSTRUCTION_PREPEND = 2
CS_INSTRUCTION_BASE64 = 3
CS_INSTRUCTION_PRINT = 4
CS_INSTRUCTION_PARAMETER = 5
CS_INSTRUCTION_HEADER = 6
CS_INSTRUCTION_BUILD = 7
CS_INSTRUCTION_NETBIOS = 8
CS_INSTRUCTION_CONST_PARAMETER = 9
CS_INSTRUCTION_CONST_HEADER = 10
CS_INSTRUCTION_NETBIOSU = 11
CS_INSTRUCTION_URI_APPEND = 12
CS_INSTRUCTION_BASE64URL = 13
CS_INSTRUCTION_STRREP = 14
CS_INSTRUCTION_MASK = 15
CS_INSTRUCTION_CONST_HOST_HEADER = 16
def __init__(self, instructionType, instructions):
self.instructionType = instructionType
self.instructions = instructions
@staticmethod
def StartsWithGetRemainder(strIn, strStart):
if strIn.startswith(strStart):
return True, strIn[len(strStart):]
else:
return False, None
@staticmethod
def BASE64URLDecode(data):
paddingLength = 4 - len(data) % 4
if paddingLength <= 2:
data += b'=' * paddingLength
return base64.b64decode(data, b'-_')
@staticmethod
def NETBIOSDecode(netbios):
dTranslate = {
ord(b'A'): ord(b'0'),
ord(b'B'): ord(b'1'),
ord(b'C'): ord(b'2'),
ord(b'D'): ord(b'3'),
ord(b'E'): ord(b'4'),
ord(b'F'): ord(b'5'),
ord(b'G'): ord(b'6'),
ord(b'H'): ord(b'7'),
ord(b'I'): ord(b'8'),
ord(b'J'): ord(b'9'),
ord(b'K'): ord(b'A'),
ord(b'L'): ord(b'B'),
ord(b'M'): ord(b'C'),
ord(b'N'): ord(b'D'),
ord(b'O'): ord(b'E'),
ord(b'P'): ord(b'F'),
}
return binascii.a2b_hex(bytes([dTranslate[char] for char in netbios]))
def GetInstructions(self):
for result in self.instructions.split(';'):
match, remainder = __class__.StartsWithGetRemainder(result, '7:%s,' % self.instructionType)
if match:
if self.instructionType in [__class__.CS_INSTRUCTION_TYPE_OUTPUT, __class__.CS_INSTRUCTION_TYPE_METADATA]:
return ','.join(remainder.split(',')[::-1])
else:
return remainder
return ''
def ProcessInstructions(self, rawdata):
instructions = self.GetInstructions()
if instructions == '':
instructions = []
else:
instructions = [instruction for instruction in instructions.split(',')]
data = rawdata
for instruction in instructions:
instruction = instruction.split(':')
opcode = int(instruction[0])
operands = instruction[1:]
if opcode == __class__.CS_INSTRUCTION_NONE:
pass
elif opcode == __class__.CS_INSTRUCTION_APPEND:
if self.instructionType == __class__.CS_INSTRUCTION_TYPE_METADATA:
data = data[:-len(operands[0])]
else:
data = data[:-int(operands[0])]
elif opcode == __class__.CS_INSTRUCTION_PREPEND:
if self.instructionType == __class__.CS_INSTRUCTION_TYPE_METADATA:
data = data[len(operands[0]):]
else:
data = data[int(operands[0]):]
elif opcode == __class__.CS_INSTRUCTION_BASE64:
data = binascii.a2b_base64(data)
elif opcode == __class__.CS_INSTRUCTION_PRINT:
pass
elif opcode == __class__.CS_INSTRUCTION_PARAMETER:
pass
elif opcode == __class__.CS_INSTRUCTION_HEADER:
pass
elif opcode == __class__.CS_INSTRUCTION_BUILD:
pass
elif opcode == __class__.CS_INSTRUCTION_NETBIOS:
data = __class__.NETBIOSDecode(data.upper())
elif opcode == __class__.CS_INSTRUCTION_CONST_PARAMETER:
pass
elif opcode == __class__.CS_INSTRUCTION_CONST_HEADER:
pass
elif opcode == __class__.CS_INSTRUCTION_NETBIOSU:
data = __class__.NETBIOSDecode(data)
elif opcode == __class__.CS_INSTRUCTION_URI_APPEND:
pass
elif opcode == __class__.CS_INSTRUCTION_BASE64URL:
data = __class__.BASE64URLDecode(data)
elif opcode == __class__.CS_INSTRUCTION_STRREP:
data = data.replace(operands[0], operands[1])
elif opcode == __class__.CS_INSTRUCTION_MASK:
xorkey = data[0:4]
ciphertext = data[4:]
data = []
for iter, value in enumerate(ciphertext):
data.append(value ^ xorkey[iter % 4])
data = bytes(data)
elif opcode == __class__.CS_INSTRUCTION_CONST_HOST_HEADER:
pass
else:
raise Exception('Unknown instruction opcode: %d' % opcode)
return data
def DecryptMetadata(arg, options):
oOutput = InstantiateCOutput(options)
oOutput.Line('Input: %s' % arg)
arg = cCSInstructions(cCSInstructions.CS_INSTRUCTION_TYPE_METADATA, options.transform).ProcessInstructions(arg.encode())
oOutput.Line('Encrypted metadata: %s' % binascii.b2a_hex(arg).decode())
if options.private != '':
decrypted = RSADecrypt(options.private, arg)
if decrypted != None:
DecodeMetadata(decrypted, oOutput)
elif options.file != '':
if javaobj == None:
print('javaobj module required: pip install javaobj-py3')
exit(-1)
pobj = javaobj.load(open(options.file, 'rb'))
privateKey = binascii.b2a_hex(bytes([number & 0xFF for number in pobj.array.value.privateKey.encoded._data])).decode()
decrypted = RSADecrypt(privateKey, arg)
if decrypted != None:
DecodeMetadata(decrypted, oOutput)
else:
jsonData = GetJSONData()
for publicKey, dPrivatekey in jsonData['dLookupValues']['7'].items():
privateKey = dPrivatekey['verbose']
decrypted = RSADecrypt(privateKey, arg)
if decrypted != None:
DecodeMetadata(decrypted, oOutput)
break
def Main():
moredesc = '''
Source code put in the public domain by Didier Stevens, no Copyright
Use at your own risk
https://DidierStevens.com'''
oParser = optparse.OptionParser(usage='usage: %prog [options] encrypted_metadata\n' + __description__ + moredesc, version='%prog ' + __version__)
oParser.add_option('-m', '--man', action='store_true', default=False, help='Print manual')
oParser.add_option('-o', '--output', type=str, default='', help='Output to file (# supported)')
oParser.add_option('-p', '--private', default='', help='Private key (hexadecimal)')
oParser.add_option('-f', '--file', default='', help='File with private key')
oParser.add_option('-t', '--transform', type=str, default='7:Metadata,3', help='Transformation instructions')
(options, args) = oParser.parse_args()
if options.man:
oParser.print_help()
PrintManual()
return
if len(args) == 0:
oParser.print_help()
return
for arg in args:
DecryptMetadata(arg, options)
if __name__ == '__main__':
Main()