def __init__(self, data):
session = Session()
context = Mail()
context.parsing_date = datetime.now()
mail = message_from_string(data)
for name, adapter in component.getAdapters((context,), interfaces.IFieldMapper):
adapter.parse(mail)
for part in mail.mailparts:
type = part.type
adapter = component.queryAdapter(context, interface=interfaces.IContentMapper, name=type)
if adapter is None:
adapter = component.getAdapter(context, interface=interfaces.IContentMapper, name='default')
adapter.parse(part)
backuppath = local_configuration['backup'].get('backup', '')
if os.path.isdir(backuppath):
name = time.strftime('%Y%m%d%H%M')
path = os.path.join(backuppath, '%s.mail' % name)
counter = 0
while os.path.isfile(path):
path = os.path.join(backuppath, '%s_%s.mail' % (name, counter,))
counter += 1
context.original_path = os.path.abspath(path)
with open(path, 'w') as f:
f.write(data)
f.close()
context.hash = hashlib.md5(data).hexdigest()
session.add(context)
transaction.commit()
session.close()
def scan(self, payload: Payload, request_meta: RequestMeta) -> WorkerResponse:
message_json = {}
attachments = []
errors = []
ioc_content = ''
email_session = UnicodeDammit(payload.content).unicode_markup
message = pyzmail.message_from_string(email_session)
# Create a dict of the SMTP headers
for header in message.keys():
curr_header = header.lower()
if curr_header in message_json:
# If the header key already exists, let's join them
message_json[curr_header] += f'\n{message.get_decoded_header(header)}'
else:
message_json[curr_header] = message.get_decoded_header(header)
if not self.omit_body:
# Extract the e-mail body, to include HTML if available
message_json['body'] = (
''
if message.text_part is None
else UnicodeDammit(message.text_part.get_payload()).unicode_markup
)
message_json['body_html'] = (
''
if message.html_part is None
else UnicodeDammit(message.html_part.get_payload()).unicode_markup
)
if self.extract_iocs:
for k in self.ioc_keys:
if k in message_json:
ioc_content += f'{message_json[k]}\n'
# Handle attachments
for mailpart in message.mailparts:
# Skip if the attachment is a body part
if mailpart.is_body:
if self.extract_iocs:
ioc_content += UnicodeDammit(mailpart.get_payload()).unicode_markup
elif mailpart.type.startswith('message/'):
for part in mailpart.part.get_payload():
try:
attachment_meta = PayloadMeta(
should_archive=self.archive_attachments,
extra_data={'attached_msg': True},
dispatch_to=['smtp'],
)
attachment = ExtractedPayload(part.as_bytes(), attachment_meta)
attachments.append(attachment)
except Exception as err:
errors.append(f'Failed extracting attachment: {err}')
else:
try:
att_filename = mailpart.filename
if not att_filename:
att_filename = mailpart.sanitized_filename
attachment_meta = PayloadMeta(
should_archive=self.archive_attachments,
extra_data={
'charset': mailpart.charset,
'content-description': mailpart.part.get(
'Content-Description'
),
'content-id': mailpart.content_id,
'disposition': mailpart.disposition,
'filename': att_filename,
'type': mailpart.type,
},
dispatch_to=self.always_dispatch,
)
attachment = ExtractedPayload(
mailpart.get_payload(), attachment_meta
)
attachments.append(attachment)
except Exception as err:
errors.append(f'Failed extracting attachment: {err}')
if self.extract_iocs:
ioc_meta = PayloadMeta(should_archive=False, dispatch_to=['iocextract'])
attachments.append(ExtractedPayload(ioc_content.encode(), ioc_meta))
return WorkerResponse(message_json, errors=errors, extracted=attachments)
def scan(self, payload, **kwargs):
extracted_urls = None
extracted_ips = None
# Grab the uuid of so we can pass it off to the attachment
uuid = kwargs.get('uuid', [self.stoq.get_uuid])
payload = self.stoq.force_unicode(payload)
email_sessions = self.carve_email(payload)
# Get the appropriate metadata from the vortex filename
vortex_meta = self.vortex_metadata(kwargs['filename'])
# Iterate over each e-mail session
for email_session in email_sessions:
message_json = {}
message = pyzmail.message_from_string(email_session)
if vortex_meta:
# Setup our primary message json blob
message_json = vortex_meta
message_json['vortex_filename'] = kwargs['filename']
# Create a dict of the headers in the session
for k, v in list(message.items()):
curr_header = k.lower()
if curr_header in message_json:
# If the header key already exists, let's join them
message_json[curr_header] += "\n{}".format(message.get_decoded_header(k))
else:
message_json[curr_header] = message.get_decoded_header(k)
# Extract the e-mail body, to include HTML if available
if message.text_part is not None:
message_json['body'] = self.stoq.force_unicode(
message.text_part.get_payload())
else:
message_json['body'] = ""
if message.html_part is not None:
message_json['body_html'] = self.stoq.force_unicode(
message.html_part.get_payload())
else:
message_json['body_html'] = ""
# Make this easy, merge both text and html body within e-mail
# for the purpose of extracting any URIs
email_body = "{}{}".format(message_json['body'],
message_json['body_html'])
# Extract and normalize any IP addresses in headers
if self.extract_iocs:
# str of concatenated ip_headers
concat_ips = ""
# Define which headers we want to extract IP addresses from
ip_headers = ['src_ip',
'dest_ip',
'received',
'x-orig-ip',
'x-originating-ip',
'x-remote-ip',
'x-sender-ip']
# concat all of our headers into one string for easy searching
for ip_header in ip_headers:
if ip_header in message_json:
concat_ips += message_json[ip_header]
extracted_ips = self.readers['iocregex'].read(concat_ips,
datatype_flag='ipv4')
# Let's get a unique list of IP addresses from extracted data
if 'ipv4' in extracted_ips:
message_json['ips'] = extracted_ips['ipv4']
# extract and normalize any URLs found
extracted_urls = self.readers['iocregex'].read(email_body,
datatype_flag='url')
# Extract any URLs that may be in the merged body
if 'url' in extracted_urls:
message_json['urls'] = extracted_urls['url']
# Handle attachments
message_json['att'] = []
for mailpart in message.mailparts:
try:
filename = mailpart.filename
except TypeError:
filename = "None"
# This is a check for winmail.dat files. If successful,
# skip_attachment will be True and we will use the
# results from that instead of winmail.dat file itself.
skip_attachment = False
if mailpart.type == "text/plain":
try:
message_json['body'] += self.stoq.force_unicode(mailpart.get_payload())
except:
pass
skip_attachment = True
else:
if filename == "winmail.dat":
tnef_results = TNEF(mailpart.get_payload())
# we have data, let's handle it.
if tnef_results.attachments:
# We have a valid file within winmail.dat,
# let's make sure we only handle it here.
skip_attachment = True
for tnef_attachment in tnef_results.attachments:
try:
filename = self.stoq.force_unicode(tnef_attachment.name)
except:
filename = "None"
try:
attachment_json = self.handle_attachments(payload=tnef_attachment.data,
filename=filename,
uuid=message_json['uuid'])
if attachment_json:
message_json['att'].append(attachment_json)
except:
pass
# Let's handle the attachment normally
if not skip_attachment:
attachment_json = self.handle_attachments(payload=mailpart.get_payload(),
filename=filename,
uuid=uuid)
if attachment_json:
attachment_json['desc'] = mailpart.part.get('Content-Description')
attachment_json['type'] = mailpart.type
message_json['att'].append(attachment_json)
if self.use_bloom:
# Check bloom filters
for field_name, field_bloom in self.bloomfilters.items():
# If the configured field name exists in parsed data...
if field_name in message_json:
# extract the field value and check if it has been seen
# before...
field_value = message_json[field_name]
seen_before = field_bloom.query_filter(
field_value, add_missing=True)
# Generate JSON entry key for flagging new field values
field_flag = "{}_isnew".format(field_name)
# if the value has not been seen before...
if not seen_before:
# flag it as new within JSON
message_json[field_flag] = True
else:
message_json[field_flag] = False
return message_json
def scan(self, payload, **kwargs):
if not payload:
self.log.warn(
"SMTP session is empty. Do you have permission to the source?")
return False
extracted_urls = None
extracted_ips = None
# Grab the uuid of so we can pass it off to the attachment
uuid = kwargs.get('uuid', [self.stoq.get_uuid])
# Get the appropriate metadata from the vortex filename
vortex_meta = self.vortex_metadata(kwargs['filename'])
# If vortex_meta returns False, it means the payload being analyzed is
# the client session, which contains useless information. Let's just
# skip it.
if vortex_meta is False:
self.log.debug("Vortex client sessions provided, skipping...")
return True
# Iterate over each e-mail session
for email_session in self.carve_email(payload):
email_session = self.stoq.force_unicode(email_session)
message_json = {}
message = pyzmail.message_from_string(email_session)
if vortex_meta:
# Setup our primary message json blob
message_json = vortex_meta.copy()
message_json['vortex_filename'] = kwargs['filename']
# Create a dict of the headers in the session
for k, v in list(message.items()):
curr_header = k.lower()
if curr_header in message_json:
# If the header key already exists, let's join them
message_json[curr_header] += "\n{}".format(
message.get_decoded_header(k))
else:
message_json[curr_header] = message.get_decoded_header(k)
# Extract the e-mail body, to include HTML if available
if message.text_part is not None:
message_json['body'] = self.stoq.force_unicode(
message.text_part.get_payload())
else:
message_json['body'] = ""
if message.html_part is not None:
message_json['body_html'] = self.stoq.force_unicode(
message.html_part.get_payload())
else:
message_json['body_html'] = ""
# Make this easy, merge both text and html body within e-mail
# for the purpose of extracting any URIs
email_body = "{}{}".format(message_json['body'],
message_json['body_html'])
# Extract and normalize any IP addresses in headers
if self.extract_iocs:
# str of concatenated ip_headers
concat_ips = ""
# Define which headers we want to extract IP addresses from
ip_headers = [
'src_ip', 'dest_ip', 'received', 'x-orig-ip',
'x-originating-ip', 'x-remote-ip', 'x-sender-ip'
]
# concat all of our headers into one string for easy searching
for ip_header in ip_headers:
if ip_header in message_json:
concat_ips += message_json[ip_header]
extracted_ips = self.readers['iocregex'].read(
concat_ips, datatype_flag='ipv4')
# Let's get a unique list of IP addresses from extracted data
if 'ipv4' in extracted_ips:
message_json['ips'] = extracted_ips['ipv4']
# extract and normalize any URLs found
extracted_urls = self.readers['iocregex'].read(
email_body, datatype_flag='url')
# Extract any URLs that may be in the merged body
if 'url' in extracted_urls:
message_json['urls'] = extracted_urls['url']
# Handle attachments
message_json['att'] = []
for mailpart in message.mailparts:
try:
filename = mailpart.filename
except TypeError:
filename = "None"
# This is a check for winmail.dat files. If successful,
# skip_attachment will be True and we will use the
# results from that instead of winmail.dat file itself.
skip_attachment = False
if mailpart.type == "text/plain":
try:
message_json['body'] += self.stoq.force_unicode(
mailpart.get_payload())
except:
pass
skip_attachment = True
else:
if filename == "winmail.dat":
tnef_results = TNEF(mailpart.get_payload())
# we have data, let's handle it.
if tnef_results.attachments:
# We have a valid file within winmail.dat,
# let's make sure we only handle it here.
skip_attachment = True
for tnef_attachment in tnef_results.attachments:
try:
filename = self.stoq.force_unicode(
tnef_attachment.name)
except:
filename = "None"
try:
attachment_json = self.handle_attachments(
payload=tnef_attachment.data,
filename=filename,
uuid=message_json['uuid'])
if attachment_json:
message_json['att'].append(
attachment_json)
except:
pass
# Let's handle the attachment normally
if not skip_attachment:
attachment_json = self.handle_attachments(
payload=mailpart.get_payload(),
filename=filename,
uuid=uuid)
if attachment_json:
attachment_json['desc'] = mailpart.part.get(
'Content-Description')
attachment_json['type'] = mailpart.type
message_json['att'].append(attachment_json)
if self.use_bloom:
# Check bloom filters
for field_name, field_bloom in self.bloomfilters.items():
# If the configured field name exists in parsed data...
if field_name in message_json:
# extract the field value and check if it has been seen
# before...
field_value = message_json[field_name]
seen_before = field_bloom.query_filter(
field_value, add_missing=True)
# Generate JSON entry key for flagging new field values
field_flag = "{}_isnew".format(field_name)
# if the value has not been seen before...
if not seen_before:
# flag it as new within JSON
message_json[field_flag] = True
else:
message_json[field_flag] = False
# Make sure we delete the body and body_html keys if they are to
# be omitted
if self.omit_body:
message_json.pop('body', None)
message_json.pop('body_html', None)
yield message_json
