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NetExec/cme/modules/scan-network.py

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# Credit to https://twitter.com/snovvcrash/status/1550518555438891009
# Credit to https://github.com/dirkjanm/adidnsdump @_dirkjan
# module by @mpgn_x64
from struct import unpack, pack
from impacket.structure import Structure
from ldap3 import NTLM, Server, Connection, ALL, LEVEL, BASE, MODIFY_DELETE, MODIFY_ADD, MODIFY_REPLACE, Tls
from datetime import datetime
from builtins import str
import socket
import codecs
import dns.resolver
import dns.name
def get_dns_zones(connection, root, debug=False):
connection.search(root, '(objectClass=dnsZone)', search_scope=LEVEL, attributes=['dc'])
zones = []
for entry in connection.response:
if entry['type'] != 'searchResEntry':
continue
zones.append(entry['attributes']['dc'])
return zones
def get_dns_resolver(server, context):
# Create a resolver object
dnsresolver = dns.resolver.Resolver()
# Is our host an IP? In that case make sure the server IP is used
# if not assume lookups are working already
try:
if server.startswith('ldap://'):
server = server[7:]
if server.startswith('ldaps://'):
server = server[8:]
socket.inet_aton(server)
dnsresolver.nameservers = [server]
except socket.error:
context.info('Using System DNS to resolve unknown entries. Make sure resolving your target domain works here or specify an IP'\
' as target host to use that server for queries')
return dnsresolver
def ldap2domain(ldap):
return re.sub(',DC=', '.', ldap[ldap.lower().find('dc='):], flags=re.I)[3:]
def new_record(rtype, serial):
nr = DNS_RECORD()
nr['Type'] = rtype
nr['Serial'] = serial
nr['TtlSeconds'] = 180
# From authoritive zone
nr['Rank'] = 240
return nr
# From: https://docs.microsoft.com/en-us/windows/win32/dns/dns-constants
RECORD_TYPE_MAPPING = {
0: 'ZERO',
1: 'A',
2: 'NS',
5: 'CNAME',
6: 'SOA',
12: 'PTR',
#15: 'MX',
#16: 'TXT',
28: 'AAAA',
33: 'SRV'
}
def searchResEntry_to_dict(results):
data = {}
for attr in results['attributes']:
key = str(attr['type'])
value = str(attr['vals'][0])
data[key] = value
return data
class CMEModule:
name = 'get-network'
description = ""
supported_protocols = ['ldap']
opsec_safe = True
multiple_hosts = True
def options(self, context, module_options):
"""
ALL Get DNS and IP (default: false)
ONLY_HOSTS Get DNS only (no ip) (default: false)
"""
self.showall = False
self.showhosts = False
self.showip = True
if module_options and 'ALL' in module_options:
if module_options['ALL'].lower() == "true" or module_options['ALL'] == "1":
self.showall = True
else:
print("Could not parse ALL option.")
if module_options and 'IP' in module_options:
if module_options['IP'].lower() == "true" or module_options['IP'] == "1":
self.showip = True
else:
print("Could not parse ONLY_HOSTS option.")
if module_options and 'ONLY_HOSTS' in module_options:
if module_options['ONLY_HOSTS'].lower() == "true" or module_options['ONLY_HOSTS'] == "1":
self.showhosts = True
else:
print("Could not parse ONLY_HOSTS option.")
def on_login(self, context, connection):
zone = ldap2domain(connection.baseDN)
dnsroot = 'CN=MicrosoftDNS,DC=DomainDnsZones,%s' % connection.baseDN
searchtarget = 'DC=%s,%s' % (zone, dnsroot)
context.log.info('Querying zone for records')
sfilter = '(DC=*)'
try:
list_sites = connection.ldapConnection.search(
searchBase=searchtarget,
searchFilter=sfilter,
attributes=['dnsRecord','dNSTombstoned','name'],
sizeLimit=100000
)
except ldap.LDAPSearchError as e:
if e.getErrorString().find('sizeLimitExceeded') >= 0:
logging.debug('sizeLimitExceeded exception caught, giving up and processing the data received')
# We reached the sizeLimit, process the answers we have already and that's it. Until we implement
# paged queries
list_sites = e.getAnswers()
pass
else:
raise
targetentry = None
dnsresolver = get_dns_resolver(connection.host, context.log)
outdata = []
for item in list_sites:
if isinstance(item, ldapasn1_impacket.SearchResultEntry) is not True:
continue
site = searchResEntry_to_dict(item)
recordname = site['name']
if "dnsRecord" in site:
record = bytes(site['dnsRecord'].encode('latin1'))
dr = DNS_RECORD(record)
if RECORD_TYPE_MAPPING[dr['Type']] == "A":
if dr['Type'] == 1:
address = DNS_RPC_RECORD_A(dr['Data'])
if str(recordname) != 'DomainDnsZones' and str(recordname) != 'ForestDnsZones':
outdata.append({'name':recordname, 'type': RECORD_TYPE_MAPPING[dr['Type']], 'value': address.formatCanonical()})
if dr['Type'] in [a for a in RECORD_TYPE_MAPPING if RECORD_TYPE_MAPPING[a] in ['CNAME', 'NS', 'PTR']]:
address = DNS_RPC_RECORD_NODE_NAME(dr['Data'])
if str(recordname) != 'DomainDnsZones' and str(recordname) != 'ForestDnsZones':
outdata.append({'name':recordname, 'type':RECORD_TYPE_MAPPING[dr['Type']], 'value': address[list(address.fields)[0]].toFqdn()})
elif dr['Type'] == 28:
address = DNS_RPC_RECORD_AAAA(dr['Data'])
if str(recordname) != 'DomainDnsZones' and str(recordname) != 'ForestDnsZones':
outdata.append({'name':recordname, 'type':RECORD_TYPE_MAPPING[dr['Type']], 'value': address.formatCanonical()})
context.log.highlight('Found %d records' % len(outdata))
path = os.path.expanduser('~/.cme/logs/{}_network_{}.log'.format(connection.domain, datetime.now().strftime("%Y-%m-%d_%H%M%S")))
with codecs.open(path, 'w', 'utf-8') as outfile:
for row in outdata:
if self.showhosts:
outfile.write('{}\n'.format(row['name'] + '.' + connection.domain))
elif self.showall:
outfile.write('{} \t {}\n'.format(row['name'] + '.' + connection.domain, row['value']))
else:
outfile.write('{}\n'.format(row['value']))
context.log.success('Dumped {} records to {}'.format(len(outdata), path))
if not self.showall and not self.showhosts:
context.log.info("To extract CIDR from the {} ip, run the following command: cat your_file | mapcidr -aa -silent | mapcidr -a -silent".format(len(outdata)))
class DNS_RECORD(Structure):
"""
dnsRecord - used in LDAP
[MS-DNSP] section 2.3.2.2
"""
structure = (
('DataLength', '<H-Data'),
('Type', '<H'),
('Version', 'B=5'),
('Rank', 'B'),
('Flags', '<H=0'),
('Serial', '<L'),
('TtlSeconds', '>L'),
('Reserved', '<L=0'),
('TimeStamp', '<L=0'),
('Data', ':')
)
# Note that depending on whether we use RPC or LDAP all the DNS_RPC_XXXX
# structures use DNS_RPC_NAME when communication is over RPC,
# but DNS_COUNT_NAME is the way they are stored in LDAP.
#
# Since LDAP is the primary goal of this script we use that, but for use
# over RPC the DNS_COUNT_NAME in the structures must be replaced with DNS_RPC_NAME,
# which is also consistent with how MS-DNSP describes it.
class DNS_RPC_NAME(Structure):
"""
DNS_RPC_NAME
Used for FQDNs in RPC communication.
MUST be converted to DNS_COUNT_NAME for LDAP
[MS-DNSP] section 2.2.2.2.1
"""
structure = (
('cchNameLength', 'B-dnsName'),
('dnsName', ':')
)
class DNS_COUNT_NAME(Structure):
"""
DNS_COUNT_NAME
Used for FQDNs in LDAP communication
MUST be converted to DNS_RPC_NAME for RPC communication
[MS-DNSP] section 2.2.2.2.2
"""
structure = (
('Length', 'B-RawName'),
('LabelCount', 'B'),
('RawName', ':')
)
def toFqdn(self):
ind = 0
labels = []
for i in range(self['LabelCount']):
nextlen = unpack('B', self['RawName'][ind:ind+1])[0]
labels.append(self['RawName'][ind+1:ind+1+nextlen].decode('utf-8'))
ind += nextlen + 1
# For the final dot
labels.append('')
return '.'.join(labels)
class DNS_RPC_NODE(Structure):
"""
DNS_RPC_NODE
[MS-DNSP] section 2.2.2.2.3
"""
structure = (
('wLength', '>H'),
('wRecordCount', '>H'),
('dwFlags', '>L'),
('dwChildCount', '>L'),
('dnsNodeName', ':')
)
class DNS_RPC_RECORD_A(Structure):
"""
DNS_RPC_RECORD_A
[MS-DNSP] section 2.2.2.2.4.1
"""
structure = (
('address', ':'),
)
def formatCanonical(self):
return socket.inet_ntoa(self['address'])
def fromCanonical(self, canonical):
self['address'] = socket.inet_aton(canonical)
class DNS_RPC_RECORD_NODE_NAME(Structure):
"""
DNS_RPC_RECORD_NODE_NAME
[MS-DNSP] section 2.2.2.2.4.2
"""
structure = (
('nameNode', ':', DNS_COUNT_NAME),
)
class DNS_RPC_RECORD_SOA(Structure):
"""
DNS_RPC_RECORD_SOA
[MS-DNSP] section 2.2.2.2.4.3
"""
structure = (
('dwSerialNo', '>L'),
('dwRefresh', '>L'),
('dwRetry', '>L'),
('dwExpire', '>L'),
('dwMinimumTtl', '>L'),
('namePrimaryServer', ':', DNS_COUNT_NAME),
('zoneAdminEmail', ':', DNS_COUNT_NAME)
)
class DNS_RPC_RECORD_NULL(Structure):
"""
DNS_RPC_RECORD_NULL
[MS-DNSP] section 2.2.2.2.4.4
"""
structure = (
('bData', ':'),
)
# Some missing structures here that I skipped
class DNS_RPC_RECORD_NAME_PREFERENCE(Structure):
"""
DNS_RPC_RECORD_NAME_PREFERENCE
[MS-DNSP] section 2.2.2.2.4.8
"""
structure = (
('wPreference', '>H'),
('nameExchange', ':', DNS_COUNT_NAME)
)
# Some missing structures here that I skipped
class DNS_RPC_RECORD_AAAA(Structure):
"""
DNS_RPC_RECORD_AAAA
[MS-DNSP] section 2.2.2.2.4.17
"""
structure = (
('ipv6Address', '16s'),
)
def formatCanonical(self):
return socket.inet_ntop(socket.AF_INET6, self['ipv6Address'])
class DNS_RPC_RECORD_SRV(Structure):
"""
DNS_RPC_RECORD_SRV
[MS-DNSP] section 2.2.2.2.4.18
"""
structure = (
('wPriority', '>H'),
('wWeight', '>H'),
('wPort', '>H'),
('nameTarget', ':', DNS_COUNT_NAME)
)
class DNS_RPC_RECORD_TS(Structure):
"""
DNS_RPC_RECORD_TS
[MS-DNSP] section 2.2.2.2.4.23
"""
structure = (
('entombedTime', '<Q'),
)
def toDatetime(self):
microseconds = int(self['entombedTime'] / 10)
try:
return datetime.datetime(1601,1,1) + datetime.timedelta(microseconds=microseconds)
except OverflowError:
return None
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