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Merge pull request #178 from Derekt2/master
Adding John the Ripper for Dictionary attacks & Option for Bruteforcing.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,64 +1,116 @@ | ||
| import io | ||
| import os | ||
| import msoffcrypto | ||
| import subprocess | ||
| import tempfile | ||
|
|
||
| from strelka import strelka | ||
|
|
||
| def crack_word(self, data, jtr_path, tmp_dir, password_file, max_length=10, scanner_timeout=150, brute=False): | ||
| try: | ||
| with tempfile.NamedTemporaryFile(dir=tmp_dir, mode='wb') as tmp_data: | ||
| tmp_data.write(data) | ||
| tmp_data.flush() | ||
|
|
||
| (office2john, stderr) = subprocess.Popen( | ||
| [jtr_path+'office2john.py', tmp_data.name], | ||
| stdout=subprocess.PIPE, | ||
| stderr=subprocess.DEVNULL | ||
| ).communicate() | ||
|
|
||
| with tempfile.NamedTemporaryFile(dir=tmp_dir) as tmp_data: | ||
| tmp_data.write(office2john) | ||
| tmp_data.flush() | ||
|
|
||
| class ScanEncryptedDoc(strelka.Scanner): | ||
| (stdout, stderr) = subprocess.Popen( | ||
| [jtr_path+'john', '--show', tmp_data.name], | ||
| stdout=subprocess.PIPE, | ||
| stderr=subprocess.DEVNULL | ||
| ).communicate() | ||
|
|
||
| if b"0 password hashes cracked" in stdout: | ||
|
|
||
| def init(self): | ||
| self.passwords = [] | ||
| with tempfile.NamedTemporaryFile(dir=tmp_dir) as tmp_data: | ||
| tmp_data.write(office2john) | ||
| tmp_data.flush() | ||
|
|
||
| if os.path.isfile(password_file): | ||
| (stdout, stderr) = subprocess.Popen( | ||
| [jtr_path+'john', f'-w={password_file}', tmp_data.name], | ||
| stdout=subprocess.PIPE, | ||
| stderr=subprocess.DEVNULL | ||
| ).communicate(timeout=scanner_timeout) | ||
|
|
||
| if stdout.split(b'\n')[3]: | ||
| self.flags.append('cracked_by_wordlist') | ||
| return stdout.split(b'\n')[3].split()[0] | ||
|
|
||
| def scan(self, data, file, options, expire_at): | ||
| password_file = options.get('password_file', '/etc/strelka/passwords.dat') | ||
| if brute: | ||
| (stdout, stderr) = subprocess.Popen( | ||
| [jtr_path+'john', '--incremental=Alnum', f'--max-length={max_length}', f'--max-run-time={scanner_timeout}', tmp_data.name], | ||
| stdout=subprocess.PIPE, | ||
| stderr=subprocess.DEVNULL | ||
| ).communicate(timeout=scanner_timeout) | ||
| if stdout.split(b'\n')[3]: | ||
| self.flags.append('cracked_by_incremental') | ||
| return stdout.split(b'\n')[3].split()[0] | ||
| return '' | ||
| else: | ||
| return stdout.split(b':')[1].split()[0] | ||
|
|
||
| if not self.passwords: | ||
| if os.path.isfile(password_file): | ||
| with open(password_file, 'rb') as f: | ||
| for line in f: | ||
| self.passwords.append(line.strip()) | ||
| except Exception as e: | ||
| self.flags.append(str(e)) | ||
| return '' | ||
|
|
||
| with io.BytesIO(data) as doc_io: | ||
| class ScanEncryptedDoc(strelka.Scanner): | ||
| """Extracts passwords from encrypted office word documents. | ||
| msoff_doc = msoffcrypto.OfficeFile(doc_io) | ||
| output_doc = io.BytesIO() | ||
| password = '' | ||
| extract_data = b'' | ||
| Attributes: | ||
| passwords: List of passwords to use when bruteforcing encrypted files. | ||
| if msoff_doc.is_encrypted(): | ||
| self.flags.append('password_protected') | ||
|
|
||
| for pw in self.passwords: | ||
| if not password: | ||
| try: | ||
| msoff_doc.load_key(password=pw.decode('utf-8')) | ||
| output_doc.seek(0) | ||
| msoff_doc.decrypt(output_doc) | ||
| output_doc.seek(0) | ||
| Options: | ||
| limit: Maximum number of files to extract. | ||
| Defaults to 1000. | ||
| password_file: Location of passwords file for zip archives. | ||
| Defaults to /etc/strelka/passwords.dat. | ||
| """ | ||
| def scan(self, data, file, options, expire_at): | ||
|
|
||
| jtr_path = options.get('jtr_path', '/jtr/') | ||
| tmp_directory = options.get('tmp_file_directory', '/tmp/') | ||
| password_file = options.get('password_file', '/etc/strelka/passwords.dat') | ||
| log_extracted_pws = options.get('log_pws', False) | ||
| scanner_timeout = options.get('scanner_timeout', 150) | ||
| brute = options.get('brute_force', False) | ||
| max_length = options.get('max_length', 5) | ||
|
|
||
| if output_doc.readable(): | ||
| extract_data = output_doc.read() | ||
| password = pw.decode('utf-8') | ||
| break | ||
| with io.BytesIO(data) as doc_io: | ||
|
|
||
| except Exception: | ||
| pass | ||
| msoff_doc = msoffcrypto.OfficeFile(doc_io) | ||
| output_doc = io.BytesIO() | ||
| if extracted_pw := crack_word(self, data, jtr_path, tmp_directory, brute=brute, scanner_timeout=scanner_timeout, max_length=max_length, password_file=password_file): | ||
| if log_extracted_pws: | ||
| self.event['cracked_password'] = extracted_pw | ||
| try: | ||
| msoff_doc.load_key(password=extracted_pw.decode('utf-8')) | ||
| msoff_doc.decrypt(output_doc) | ||
| output_doc.seek(0) | ||
| extract_data = output_doc.read() | ||
| output_doc.seek(0) | ||
| extract_file = strelka.File( | ||
| source=self.name, | ||
| ) | ||
|
|
||
| if password: | ||
| self.event['password'] = password | ||
| extract_file = strelka.File( | ||
| source=self.name, | ||
| ) | ||
| for c in strelka.chunk_string(extract_data): | ||
| self.upload_to_coordinator( | ||
| extract_file.pointer, | ||
| c, | ||
| expire_at, | ||
| ) | ||
|
|
||
| for c in strelka.chunk_string(extract_data): | ||
| self.upload_to_coordinator( | ||
| extract_file.pointer, | ||
| c, | ||
| expire_at, | ||
| ) | ||
| self.files.append(extract_file) | ||
| except: | ||
| self.flags.append('Could not decrypt document with recovered password') | ||
|
|
||
| self.files.append(extract_file) | ||
| else: | ||
| self.flags.append('no_password_match_found') | ||
| else: | ||
| self.flags.append('Could not extract password') |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| import subprocess | ||
| import tempfile | ||
| import io | ||
| import os | ||
| import zipfile | ||
| import zlib | ||
|
|
||
| from strelka import strelka | ||
|
|
||
| def crack_zip(self, data, jtr_path, tmp_dir, password_file, brute=False, max_length=10, scanner_timeout=150): | ||
| try: | ||
| with tempfile.NamedTemporaryFile(dir=tmp_dir, mode='wb') as tmp_data: | ||
| tmp_data.write(data) | ||
| tmp_data.flush() | ||
|
|
||
| (zip2john, stderr) = subprocess.Popen( | ||
| [jtr_path+'zip2john', tmp_data.name], | ||
| stdout=subprocess.PIPE, | ||
| stderr=subprocess.DEVNULL | ||
| ).communicate() | ||
|
|
||
| with tempfile.NamedTemporaryFile(dir=tmp_dir) as tmp_data: | ||
| tmp_data.write(zip2john) | ||
| tmp_data.flush() | ||
|
|
||
| (stdout, stderr) = subprocess.Popen( | ||
| [jtr_path+'john', '--show', tmp_data.name], | ||
| stdout=subprocess.PIPE, | ||
| stderr=subprocess.DEVNULL | ||
| ).communicate() | ||
|
|
||
| if b"0 password hashes cracked" in stdout: | ||
|
|
||
| with tempfile.NamedTemporaryFile(dir=tmp_dir) as tmp_data: | ||
| tmp_data.write(zip2john) | ||
| tmp_data.flush() | ||
|
|
||
| if os.path.isfile(password_file): | ||
| (stdout, stderr) = subprocess.Popen( | ||
| [jtr_path+'john', f'-w={password_file}', tmp_data.name], | ||
| stdout=subprocess.PIPE, | ||
| stderr=subprocess.DEVNULL | ||
| ).communicate(timeout=scanner_timeout) | ||
|
|
||
| if stdout.split(b'\n')[1]: | ||
| self.flags.append('cracked_by_wordlist') | ||
| return stdout.split(b'\n')[1].split()[0] | ||
| if brute: | ||
| (stdout, stderr) = subprocess.Popen( | ||
| [jtr_path+'john', '--incremental=Alnum', f'--max-length={max_length}', f'--max-run-time={scanner_timeout}', tmp_data.name], | ||
| stdout=subprocess.PIPE, | ||
| stderr=subprocess.DEVNULL | ||
| ).communicate(timeout=scanner_timeout) | ||
| if stdout.split(b'\n')[1]: | ||
| self.flags.append('cracked_by_incremental') | ||
| return stdout.split(b'\n')[1].split()[0] | ||
| return '' | ||
| else: | ||
| return stdout.split(b':')[1] | ||
|
|
||
| except Exception as e: | ||
| self.flags.append(str(e)) | ||
| return '' | ||
|
|
||
|
|
||
| class ScanEncryptedZip(strelka.Scanner): | ||
| """Extracts passwords from encrypted ZIP archives. | ||
| Attributes: | ||
| passwords: List of passwords to use when bruteforcing encrypted files. | ||
| Options: | ||
| limit: Maximum number of files to extract. | ||
| Defaults to 1000. | ||
| password_file: Location of passwords file for zip archives. | ||
| Defaults to /etc/strelka/passwords.dat. | ||
| """ | ||
|
|
||
| def scan(self, data, file, options, expire_at): | ||
|
|
||
| jtr_path = options.get('jtr_path', '/jtr/') | ||
| tmp_directory = options.get('tmp_file_directory', '/tmp/') | ||
| file_limit = options.get('limit', 1000) | ||
| password_file = options.get('password_file', '/etc/strelka/passwords.dat') | ||
| log_extracted_pws = options.get('log_pws', False) | ||
| scanner_timeout = options.get('scanner_timeout', 150) | ||
| brute = options.get('brute_force', False) | ||
| max_length = options.get('max_length', 5) | ||
|
|
||
| self.event['total'] = {'files': 0, 'extracted': 0} | ||
|
|
||
| with io.BytesIO(data) as zip_io: | ||
| try: | ||
| with zipfile.ZipFile(zip_io) as zip_obj: | ||
| name_list = zip_obj.namelist() | ||
| self.event['total']['files'] = len(name_list) | ||
|
|
||
| extracted_pw = crack_zip(self, data, jtr_path, tmp_directory, brute=brute, scanner_timeout=scanner_timeout, max_length=max_length, password_file=password_file) | ||
| if not extracted_pw: | ||
| self.flags.append('Could not extract password') | ||
| return | ||
| if log_extracted_pws: | ||
| self.event['cracked_password'] = extracted_pw | ||
| for i, name in enumerate(name_list): | ||
| if not name.endswith('/'): | ||
| if self.event['total']['extracted'] >= file_limit: | ||
| break | ||
|
|
||
| try: | ||
| extract_data = zip_obj.read(name, extracted_pw) | ||
|
|
||
| if extract_data: | ||
| extract_file = strelka.File( | ||
| name=name, | ||
| source=self.name, | ||
| ) | ||
|
|
||
| for c in strelka.chunk_string(extract_data): | ||
| self.upload_to_coordinator( | ||
| extract_file.pointer, | ||
| c, | ||
| expire_at, | ||
| ) | ||
|
|
||
| self.files.append(extract_file) | ||
| self.event['total']['extracted'] += 1 | ||
|
|
||
| except NotImplementedError: | ||
| self.flags.append('unsupported_compression') | ||
| except RuntimeError: | ||
| self.flags.append('runtime_error') | ||
| except ValueError: | ||
| self.flags.append('value_error') | ||
| except zlib.error: | ||
| self.flags.append('zlib_error') | ||
|
|
||
| except zipfile.BadZipFile: | ||
| self.flags.append('bad_zip') |
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