├── README.md ├── auto_xor_decryptor.py └── LICENSE /README.md: -------------------------------------------------------------------------------- 1 | scripts 2 | ======= 3 | 4 | Scripts created by MRG Effitas 5 | -------------------------------------------------------------------------------- /auto_xor_decryptor.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | 3 | from __future__ import print_function 4 | from __future__ import unicode_literals 5 | from itertools import groupby 6 | from operator import itemgetter 7 | import binascii 8 | import re 9 | import struct 10 | import argparse 11 | import os 12 | import sys 13 | 14 | 15 | req_version = (3,3) 16 | cur_version = sys.version_info 17 | 18 | if cur_version < req_version: 19 | print ("Python 3.3 required. Exiting.") 20 | exit() 21 | 22 | ''' 23 | ## ## ######## ###### ######## ######## ######## #### ######## ### ###### 24 | ### ### ## ## ## ## ## ## ## ## ## ## ## ## ## 25 | #### #### ## ## ## ## ## ## ## ## ## ## ## 26 | ## ### ## ######## ## #### ###### ###### ###### ## ## ## ## ###### 27 | ## ## ## ## ## ## ## ## ## ## ## ######### ## 28 | ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## 29 | ## ## ## ## ###### ######## ## ## #### ## ## ## ###### 30 | ''' 31 | 32 | ''' 33 | This program is free software: you can redistribute it and/or modify 34 | it under the terms of the GNU General Public License as published by 35 | the Free Software Foundation, either version 3 of the License, or 36 | (at your option) any later version. 37 | 38 | This program is distributed in the hope that it will be useful, 39 | but WITHOUT ANY WARRANTY; without even the implied warranty of 40 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 41 | GNU General Public License for more details. 42 | 43 | You should have received a copy of the GNU General Public License 44 | along with this program. If not, see . 45 | ''' 46 | 47 | print ("Auto XOR decryptor by MRG Effitas. Developed and tested on Python 3.3!") 48 | print ("") 49 | print ("This tool can automagically find short XOR keys in a XOR encrypted binary file, and use ") 50 | print ("that to decrypt the XOR encrypted binary. Most parameters are good on default ") 51 | print ("but if it is not working for you, you might try to fine-tune those.") 52 | 53 | parser = argparse.ArgumentParser() 54 | parser.add_argument("--input", action="store", dest="input", required=False, 55 | default="encrypted", help="input file name, default is encrypted") 56 | 57 | parser.add_argument("--output", action="store", dest="output", required=False, 58 | default="decrypted", help="output file name, default is decrypted") 59 | 60 | parser.add_argument("--xorkeyhex", action="store", dest="xor_key_hex", 61 | required=False, help="xor key in hex, e.g. 31323334") 62 | 63 | parser.add_argument("--xorkeyascii", action="store", dest="xor_key_ascii", 64 | required=False, help="xor key in ascii, e.g. ijkl") 65 | 66 | parser.add_argument("--offset", action="store", dest="offset", required=False, 67 | help="offset to rotate the xor key") 68 | 69 | parser.add_argument("--keyminlen", action="store", dest="keyminlen", required=False, 70 | default="2", help="minimum key length (measured in hex string), default 2") 71 | 72 | parser.add_argument("--patternmaxsearch", action="store", dest="patternmaxsearch", required=False, 73 | default="500", help="max length to search for pattern in the result, default 500") 74 | 75 | parser.add_argument("--xorkeymaxsearch", action="store", dest="xorkeymaxsearch", required=False, 76 | default="500", help="max distance to search for XOR key in the encrypted file, default 500") 77 | 78 | 79 | parser.add_argument("--pattern", action="store", dest="pattern", required=False 80 | , default=b"program", help="pattern which is found in valid" 81 | "file. e.g. \"This program cannot be run in DOS mode\"." 82 | " Default is \"program\" . ") 83 | 84 | # Parse the arguments 85 | args = parser.parse_args() 86 | filename = args.input 87 | output = args.output 88 | if args.xor_key_hex: 89 | xor_key = args.xor_key_hex 90 | if args.xor_key_ascii: 91 | xor_key_ascii = args.xor_key_ascii 92 | if args.offset: 93 | offset = int(args.offset) 94 | 95 | # the longest_common_substring and suffix_array methods are from http://stackoverflow.com/a/13693834/2716262 96 | def longest_common_substring(text): 97 | """Get the longest common substrings and their positions. 98 | >>> longest_common_substring('banana') 99 | {'ana': [1, 3]} 100 | >>> text = "not so Agamemnon, who spoke fiercely to " 101 | >>> sorted(longest_common_substring(text).items()) 102 | [(' s', [3, 21]), ('no', [0, 13]), ('o ', [5, 20, 38])] 103 | 104 | This function can be easy modified for any criteria, e.g. for searching ten 105 | longest non overlapping repeated substrings. 106 | """ 107 | sa, rsa, lcp = suffix_array(text) 108 | maxlen = max(lcp) 109 | result = {} 110 | for i in range(1, len(text)): 111 | if lcp[i] == maxlen: 112 | j1, j2, h = sa[i - 1], sa[i], lcp[i] 113 | assert text[j1:j1 + h] == text[j2:j2 + h] 114 | substring = text[j1:j1 + h] 115 | if not substring in result: 116 | result[substring] = [j1] 117 | # result[substring].append(j2) 118 | # return dict((k, sorted(v)) for k, v in result.items()) 119 | return substring 120 | 121 | def suffix_array(text, _step=16): 122 | """Analyze all common strings in the text. 123 | 124 | Short substrings of the length _step a are first pre-sorted. The are the 125 | results repeatedly merged so that the garanteed number of compared 126 | characters bytes is doubled in every iteration until all substrings are 127 | sorted exactly. 128 | 129 | Arguments: 130 | text: The text to be analyzed. 131 | _step: Is only for optimization and testing. It is the optimal length 132 | of substrings used for initial pre-sorting. The bigger value is 133 | faster if there is enough memory. Memory requirements are 134 | approximately (estimate for 32 bit Python 3.3): 135 | len(text) * (29 + (_size + 20 if _size > 2 else 0)) + 1MB 136 | 137 | Return value: (tuple) 138 | (sa, rsa, lcp) 139 | sa: Suffix array for i in range(1, size): 140 | assert text[sa[i-1]:] < text[sa[i]:] 141 | rsa: Reverse suffix array for i in range(size): 142 | assert rsa[sa[i]] == i 143 | lcp: Longest common prefix for i in range(1, size): 144 | assert text[sa[i-1]:sa[i-1]+lcp[i]] == text[sa[i]:sa[i]+lcp[i]] 145 | if sa[i-1] + lcp[i] < len(text): 146 | assert text[sa[i-1] + lcp[i]] < text[sa[i] + lcp[i]] 147 | >>> suffix_array(text='banana') 148 | ([5, 3, 1, 0, 4, 2], [3, 2, 5, 1, 4, 0], [0, 1, 3, 0, 0, 2]) 149 | 150 | Explanation: 'a' < 'ana' < 'anana' < 'banana' < 'na' < 'nana' 151 | The Longest Common String is 'ana': lcp[2] == 3 == len('ana') 152 | It is between tx[sa[1]:] == 'ana' < 'anana' == tx[sa[2]:] 153 | """ 154 | tx = text 155 | size = len(tx) 156 | step = min(max(_step, 1), len(tx)) 157 | sa = list(range(len(tx))) 158 | sa.sort(key=lambda i: tx[i:i + step]) 159 | grpstart = size * [False] + [True] # a boolean map for iteration speedup. 160 | # It helps to skip yet resolved values. The last value True is a sentinel. 161 | rsa = size * [None] 162 | stgrp, igrp = '', 0 163 | for i, pos in enumerate(sa): 164 | st = tx[pos:pos + step] 165 | if st != stgrp: 166 | grpstart[igrp] = (igrp < i - 1) 167 | stgrp = st 168 | igrp = i 169 | rsa[pos] = igrp 170 | sa[i] = pos 171 | grpstart[igrp] = (igrp < size - 1 or size == 0) 172 | while grpstart.index(True) < size: 173 | # assert step <= size 174 | nextgr = grpstart.index(True) 175 | while nextgr < size: 176 | igrp = nextgr 177 | nextgr = grpstart.index(True, igrp + 1) 178 | glist = [] 179 | for ig in range(igrp, nextgr): 180 | pos = sa[ig] 181 | if rsa[pos] != igrp: 182 | break 183 | newgr = rsa[pos + step] if pos + step < size else -1 184 | glist.append((newgr, pos)) 185 | glist.sort() 186 | for ig, g in groupby(glist, key=itemgetter(0)): 187 | g = [x[1] for x in g] 188 | sa[igrp:igrp + len(g)] = g 189 | grpstart[igrp] = (len(g) > 1) 190 | for pos in g: 191 | rsa[pos] = igrp 192 | igrp += len(g) 193 | step *= 2 194 | del grpstart 195 | # create LCP array 196 | lcp = size * [None] 197 | h = 0 198 | for i in range(size): 199 | if rsa[i] > 0: 200 | j = sa[rsa[i] - 1] 201 | while i != size - h and j != size - h and tx[i + h] == tx[j + h]: 202 | h += 1 203 | lcp[rsa[i]] = h 204 | if h > 0: 205 | h -= 1 206 | if size > 0: 207 | lcp[0] = 0 208 | return sa, rsa, lcp 209 | 210 | # XOR stream cipher 211 | def cipher(infile, outfile, padfile): 212 | block_size = len(padfile) 213 | while 1: 214 | # read data in block of the XOR key size 215 | data = infile.read(block_size) 216 | if not data: 217 | break 218 | # Python 2.7 BUG: bytes and strings are a bit messed up here 219 | # when you are working with older Python versions. 220 | # Might be fixed in future versions 221 | encoded = [ a ^ b for a, b in zip(data, padfile) ] 222 | for item in encoded: 223 | # write the result to the output file 224 | outfile.write (struct.pack("B", item)) 225 | 226 | filename = args.input 227 | # only guess the XOR key based on the first 500 (or whatever you defined) bytes 228 | with open(filename, 'rb') as f: 229 | content = f.read(int(args.xorkeymaxsearch)) 230 | #print (args.xorkeymaxsearch) 231 | f.close() 232 | 233 | try: 234 | xor_key 235 | # if we don't have the final xor_key from the user 236 | except NameError: 237 | try: 238 | xor_key_ascii 239 | # but the user defined the ascii xor key 240 | xor_key = binascii.hexlify(xor_key_ascii.encode('ascii')) 241 | formatted_hex = binascii.hexlify(xor_key) 242 | print ("XOR key hex: " + str(xor_key)) 243 | # xor_key = ''.join(long_xor_key[i:i + 2] 244 | # for i in range(0, len(long_xor_key), 2)) 245 | #print (xor_key) 246 | except NameError: 247 | # when the user have not provided any guess about the XOR key 248 | long_xor_key = longest_common_substring(content) 249 | print ("longxorkey: " + str(long_xor_key)) 250 | #formatted_hex = ''.join(long_xor_key[i:i + 2] for i in range(0, 251 | # len(long_xor_key), 2)) 252 | formatted_hex = binascii.hexlify(long_xor_key) 253 | print ("XOR key hex: " + str(formatted_hex)) 254 | r = re.compile("(.{" + args.keyminlen + r",}?)\1+") 255 | xor_key_list = r.findall(str(formatted_hex)) 256 | 257 | try: 258 | xor_key = xor_key_list[0] 259 | except IndexError: 260 | xor_key = formatted_hex 261 | 262 | # binary XOR key to be used in decryption 263 | xor_key_bin = binascii.unhexlify(xor_key) 264 | print ("XOR key ascii: " + str(xor_key_bin)) 265 | data = open (filename, 'rb+') 266 | edit = data.read () 267 | data.close () 268 | 269 | try: 270 | offset 271 | except NameError: 272 | # when the user have not provided any offset, try to guess it 273 | offset = len(xor_key_bin) - (edit.find (xor_key_bin) % len(xor_key_bin)) 274 | print ("Offset: " + str(offset)) 275 | 276 | def rotate(str1, n): 277 | rotated = str1[n:] + str1[:n] 278 | return rotated 279 | 280 | # generate the final XOR key, rotate the xor_key with the offset 281 | final_xor_key = rotate(xor_key_bin, offset) 282 | print("Final XOR key: " + str(final_xor_key)) 283 | with open(output, 'wb') as d: 284 | with open(filename, 'rb') as f: 285 | # call the XOR decryptor with input file, output file and XOR key 286 | cipher (f, d, final_xor_key) 287 | f.close() 288 | d.close() 289 | 290 | # Test whether decryption was successful, only check first 500 bytes. 291 | filehandle = open (output, 'rb+') 292 | data = filehandle.read (int(args.patternmaxsearch)) 293 | filehandle.close () 294 | pattern = args.pattern 295 | rx = re.compile(pattern, re.IGNORECASE | re.MULTILINE | re.DOTALL) 296 | result = rx.findall(data) 297 | if not result: 298 | print ("Decrypt failed, or check your pattern. Output destination file has been deleted.") 299 | os.remove(output) 300 | else: 301 | print ("Great success! input read from : " + str(filename) + 302 | ", output written to : " + str(output)) 303 | 304 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------