def parse_memory_urls(self):
self.logger.debug('Parsing memory URLs')
memory_urls = set()
memory_urls_json = self.parse(self.report, 'analysis',
'hybridanalysis', 'ipdomainstreams',
'stream')
if memory_urls_json:
if isinstance(memory_urls_json, dict):
memory_urls_json = [memory_urls_json]
for url in memory_urls_json:
if isinstance(url, str):
if is_valid(url):
memory_urls.add(url)
if isinstance(url, dict):
if 'db' in url:
if is_valid(url['db']):
memory_urls.add(url['db'])
return sorted(list(memory_urls))
def is_email_address_whitelisted(self,
address,
value_in_indicator=True,
indicator_in_value=False):
""" Returns True if the email address is whitelisted. """
# First check if the address was already cached.
if self._is_cached_whitelisted(address):
return True
if self._is_cached_nonwhitelisted(address):
return False
# Check if the address is valid.
email_pattern = re.compile(
r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,63}')
try:
if not email_pattern.match(address):
self._add_whitelisted_cache(address)
self.logger.debug('Invalid e-mail address: {}'.format(address))
return True
except:
self._add_whitelisted_cache(address)
return True
# Check if the domain is valid.
try:
domain = address.split('@')[1]
if not is_valid(domain):
self._add_whitelisted_cache(address)
self.logger.debug(
'Invalid e-mail address domain: {}'.format(address))
return True
except:
self._add_whitelisted_cache(address)
return True
return self._is_whitelisted(address, [
'Email - Address', 'WHOIS Registrant Email Address',
'Email Address From', 'Email Address Sender'
],
value_in_indicator=value_in_indicator,
indicator_in_value=indicator_in_value)
def is_domain_whitelisted(self,
domain,
value_in_indicator=False,
indicator_in_value=True):
""" Returns True if the domain has an invalid TLD or is whitelisted. """
# First check if the domain was already cached.
if self._is_cached_whitelisted(domain):
return True
if self._is_cached_nonwhitelisted(domain):
return False
# Check if the domain has a valid TLD.
if not is_valid(domain):
self._add_whitelisted_cache(domain)
self.logger.debug('Invalid domain: {}'.format(domain))
return True
return self._is_whitelisted(domain, ['URI - Domain Name'],
value_in_indicator=value_in_indicator,
indicator_in_value=indicator_in_value)
def dedup_reports(report_list, whitelist):
""" Merge a list of BaseSandboxParser subclass objects to make a single generic report. """
logger = logging.getLogger()
logger.debug('Deduping sandbox report list')
# Create the new generic report.
dedup_report = BaseSandboxParser()
for report in report_list:
dedup_report.sandbox_urls += report.sandbox_urls
if report.filename and not report.filename == 'sample':
dedup_report.filename = report.filename
if report.md5:
dedup_report.md5 = report.md5
dedup_report.indicators.append(
Indicator('Hash - MD5',
dedup_report.md5,
tags=['sandboxed_sample']))
if report.sha1:
dedup_report.sha1 = report.sha1
dedup_report.indicators.append(
Indicator('Hash - SHA1',
dedup_report.sha1,
tags=['sandboxed_sample']))
if report.sha256:
dedup_report.sha256 = report.sha256
dedup_report.indicators.append(
Indicator('Hash - SHA256',
dedup_report.sha256,
tags=['sandboxed_sample']))
if report.sha512:
dedup_report.sha512 = report.sha512
if report.ssdeep:
dedup_report.ssdeep = report.ssdeep
dedup_report.indicators.append(
Indicator('Hash - SSDEEP',
dedup_report.ssdeep,
tags=['sandboxed_sample']))
dedup_report.malware_family += report.malware_family
# Dedup the contacted hosts.
for host in report.contacted_hosts:
if not host in dedup_report.contacted_hosts:
dedup_report.contacted_hosts.append(host)
tags = ['contacted_host']
if host['protocol'] and host['port']:
tags.append('{} {}'.format(host['protocol'], host['port']))
elif host['protocol']:
tags.append(host['protocol'])
# For now we consider ALL contacted hosts to be benign, so no need to check the whitelist.
dedup_report.indicators.append(
Indicator('Address - ipv4-addr',
host['ipv4'],
status='Informational',
tags=tags))
# Dedup the dropped files.
for file in report.dropped_files:
# Dropped files are harder than the other items to properly whitelist, so we will
# initially restrict them to certain file names or file types that we care about.
if any(name in file['filename']
for name in dedup_report.good_dropped_file_names) or any(
t in file['type']
for t in dedup_report.good_dropped_file_types):
if not file in dedup_report.dropped_files:
dedup_report.dropped_files.append(file)
# If any part of the dropped file is whitelisted, make sure we mark all parts as whitelisted.
if whitelist.is_dropped_file_whitelisted(file):
status = 'Whitelisted'
file['status'] = 'Whitelisted'
else:
status = 'New'
dedup_report.indicators.append(
Indicator('Windows - FileName',
file['filename'],
status=status,
tags=['dropped_file']))
dedup_report.indicators.append(
Indicator('Hash - MD5',
file['md5'],
status=status,
tags=['dropped_file'],
relationships=[file['sha1'],
file['sha256']]))
dedup_report.indicators.append(
Indicator('Hash - SHA1',
file['sha1'],
status=status,
tags=['dropped_file'],
relationships=[file['md5'], file['sha256']]))
dedup_report.indicators.append(
Indicator('Hash - SHA256',
file['sha256'],
status=status,
tags=['dropped_file'],
relationships=[file['md5'], file['sha1']]))
# Dedup the HTTP requests.
for request in report.http_requests:
if not request in dedup_report.http_requests:
dedup_report.http_requests.append(request)
dedup_report.indicators += make_url_indicators(
[request['url']], tags=['http_request', request['method']])
# Dedup the DNS requests.
for request in report.dns_requests:
if not request in dedup_report.dns_requests:
dedup_report.dns_requests.append(request)
# If any part of the DNS request is whitelisted, make sure we mark all parts as whitelisted.
if whitelist.is_dns_request_whitelisted(request):
status = 'Whitelisted'
else:
status = 'New'
# For now we consider ALL request IP addresses to be benign, so no need to check the whitelist.
dedup_report.indicators.append(
Indicator('URI - Domain Name',
request['request'],
tags=['dns_request']))
try:
ipaddress.ip_address(request['answer'])
dedup_report.indicators.append(
Indicator('Address - ipv4-addr',
request['answer'],
tags=['dns_response'],
status='Informational',
relationships=[request['request']]))
except:
pass
# Dedup the memory strings.
dedup_report.memory_strings += report.memory_strings
dedup_report.memory_strings = sorted(
list(set(dedup_report.memory_strings)))
# Dedup the memory URLs.
dedup_report.memory_urls += report.memory_urls
dedup_report.memory_urls = list(set(dedup_report.memory_urls))
dedup_report.memory_urls = [
u for u in dedup_report.memory_urls if is_valid(u)
]
dedup_report.indicators += make_url_indicators(
dedup_report.memory_urls, tags=['url_in_memory'])
# Dedup the strings URLs.
dedup_report.strings_urls += report.strings_urls
dedup_report.strings_urls = list(set(dedup_report.strings_urls))
dedup_report.strings_urls = [
u for u in dedup_report.strings_urls if is_valid(u)
]
dedup_report.indicators += make_url_indicators(
dedup_report.strings_urls, tags=['url_in_strings'])
# Dedup the mutexes.
dedup_report.mutexes += report.mutexes
dedup_report.mutexes = list(set(dedup_report.mutexes))
# Dedup the resolved APIs.
dedup_report.resolved_apis += report.resolved_apis
dedup_report.resolved_apis = list(set(dedup_report.resolved_apis))
# Dedup the created services.
dedup_report.created_services += report.created_services
dedup_report.created_services = list(set(
dedup_report.created_services))
# Dedup the started services.
dedup_report.started_services += report.started_services
dedup_report.started_services = list(set(
dedup_report.started_services))
# Add the process tree as-is.
dedup_report.process_trees.append(report.process_tree)
# Try to decode base64 chunks in the process tree.
process_tree_decoded = report.process_tree
for chunk in report.process_tree.split():
try:
decoded_chunk = base64.b64decode(chunk).decode('utf-8')
if '\x00' in decoded_chunk:
decoded_chunk = base64.b64decode(chunk).decode('utf-16')
process_tree_decoded = process_tree_decoded.replace(
chunk, decoded_chunk)
except:
pass
dedup_report.process_trees_decoded.append(process_tree_decoded)
# Remove ` backtick and other basic Powershell obfuscation.
new_trees = []
for decoded_process_tree in dedup_report.process_trees_decoded:
if 'powershell' in decoded_process_tree.lower():
new_trees.append(decoded_process_tree.replace('`', ''))
dedup_report.process_trees_decoded += new_trees
# Remove Powershell string formatter obfuscation.
new_trees = []
for decoded_process_tree in dedup_report.process_trees_decoded:
formatter_pattern = re.compile(
r'(\([\'\"](({(\d+)})+)[\'\"]\s*\-f\s*(([\'\"][^\'\"]+[\'\"],*)+)\))',
re.IGNORECASE)
results = formatter_pattern.findall(decoded_process_tree)
if results:
for result in results:
""" ('("{0}{1}"-f\'JDxA\',\'QDc\')', '{0}{1}', '{1}', '1', "'JDxA','QDc'", "'QDc'") """
full_match = result[0]
order = result[1][1:-1] # 0}{1
items = result[4] # "'JDxA','QDc'"
order_list = order.split('}{')
order_ints = [int(x) for x in order_list]
items_list = [
i.replace('\'', '').replace('"', '')
for i in items.split(',')
]
if len(order_ints) == len(items_list):
deobfuscated_string = ''
for i in order_ints:
deobfuscated_string += items_list[i]
decoded_process_tree = decoded_process_tree.replace(
full_match, deobfuscated_string)
new_trees.append(decoded_process_tree)
dedup_report.process_trees_decoded += new_trees
# Try to decode string .split() obfuscation (used by Emotet and others)
new_trees = []
for decoded_process_tree in dedup_report.process_trees_decoded:
if 'split' in decoded_process_tree.lower():
try:
split_char_pattern = re.compile(
r'\.[\'\"]*split[\'\"]*\([\'\"\s]*(.*?)[\'\"\s]*\)',
re.IGNORECASE)
try:
split_char = str(
split_char_pattern.search(
decoded_process_tree).group(1))
except AttributeError:
split_char = None
if split_char:
new_process_tree_decoded = ' '.join(
decoded_process_tree.split(split_char))
new_process_tree_decoded = new_process_tree_decoded.replace(
"'+'", '')
new_process_tree_decoded = new_process_tree_decoded.replace(
'"+"', '')
new_process_tree_decoded = new_process_tree_decoded.replace(
'\'', ' ')
new_process_tree_decoded = new_process_tree_decoded.replace(
'\"', ' ')
new_process_tree_decoded = new_process_tree_decoded.replace(
'. ', ' ')
new_trees.append(new_process_tree_decoded)
except:
logger.exception(
'Could not find process tree split() character.')
dedup_report.process_trees_decoded += new_trees
# Try to decode string .invoke() obfuscation (used by Emotet and others)
new_trees = []
for decoded_process_tree in dedup_report.process_trees_decoded:
if 'invoke' in decoded_process_tree.lower():
try:
split_char_pattern = re.compile(
r'\.[\'\"]*invoke[\'\"]*\([\'\"\s]*(.*?)[\'\"\s]*\)',
re.IGNORECASE)
try:
split_char = str(
split_char_pattern.search(
decoded_process_tree).group(1))
except AttributeError:
split_char = None
if split_char:
new_process_tree_decoded = ' '.join(
decoded_process_tree.split(split_char))
new_process_tree_decoded = new_process_tree_decoded.replace(
"'+'", '')
new_process_tree_decoded = new_process_tree_decoded.replace(
'"+"', '')
new_process_tree_decoded = new_process_tree_decoded.replace(
'\'', ' ')
new_process_tree_decoded = new_process_tree_decoded.replace(
'\"', ' ')
new_process_tree_decoded = new_process_tree_decoded.replace(
'. ', ' ')
new_trees.append(new_process_tree_decoded)
except:
logger.exception(
'Could not find process tree invoke() character.')
dedup_report.process_trees_decoded += new_trees
# Dedup the process tree URLs. Start by just adding the URLs from each report.
dedup_report.process_tree_urls += report.process_tree_urls
# Find the URLs in each decoded process tree.
for decoded_tree in dedup_report.process_trees_decoded:
urls = find_urls(decoded_tree)
# Remove any URL that has these URLs as substrings, since it's probably a bogus
# URL from the original, non-decoded process tree.
for u in report.process_tree_urls:
if any(decoded_url in u for decoded_url in urls):
try:
dedup_report.process_tree_urls.remove(u)
logger.debug(
'Removing bad process tree URL: {}'.format(u))
except:
pass
dedup_report.process_tree_urls += urls
dedup_report.process_tree_urls = list(
set(dedup_report.process_tree_urls))
dedup_report.process_tree_urls = [
u for u in dedup_report.process_tree_urls if is_valid(u)
]
dedup_report.indicators += make_url_indicators(
dedup_report.process_tree_urls, tags=['url_in_process_tree'])
# Add the screenshot URLs as-is.
if report.screenshot_path:
dedup_report.screenshot_paths.append(report.screenshot_path)
return dedup_report
def is_url_whitelisted(self,
u,
value_in_indicator=False,
indicator_in_value=False):
""" Returns True if the URL is invalid or is whitelisted. """
# First check if the URL was already cached.
if self._is_cached_whitelisted(u):
return True
if self._is_cached_nonwhitelisted(u):
return False
# Check if the URL is valid.
if not is_valid(u):
self._add_whitelisted_cache(u)
self.logger.debug('Invalid URL: {}'.format(u))
return True
# Split the URL and check each part against the whitelist.
split_url = urlsplit(u)
# First check if the netloc has a ':' in it, which indicates that
# there is a port number specified. We need to remove that in order
# to properly check it against the whitelists.
if ':' in split_url.netloc:
netloc = split_url.netloc.split(':')[0]
else:
netloc = split_url.netloc
# Look for the edge case of the URL having a username:password notation.
if ':' in split_url.netloc and '@' in split_url.netloc:
user_pass = re.compile(r'(.*?:.*?@)').findall(split_url.netloc)[0]
user_pass_url = u.replace(user_pass, '')
split_url = urlsplit(user_pass_url)
netloc = split_url.netloc
# Check the netloc. Check if it is an IP address.
try:
ipaddress.ip_address(netloc)
if self.is_ip_whitelisted(netloc):
self._add_whitelisted_cache(u)
self.logger.debug(
'URL whitelisted because of IP: {}'.format(u))
return True
# If we got an exception, it must be a domain name.
except:
if self.is_domain_whitelisted(netloc):
self._add_whitelisted_cache(u)
self.logger.debug(
'URL whitelisted because of domain: {}'.format(u))
return True
# Check the URI path if it exists.
if split_url.path and split_url.path != '/':
if self.is_uri_path_whitelisted(split_url.path):
self._add_whitelisted_cache(u)
self.logger.debug(
'URL whitelisted because of path: {}'.format(u))
return True
# Check the URI query if it exists.
if split_url.query:
if self.is_uri_path_whitelisted(split_url.query):
self._add_whitelisted_cache(u)
self.logger.debug(
'URL whitelisted because of query: {}'.format(u))
return True
# Finally check the entire URL.
return self._is_whitelisted(u, ['URI - URL'],
value_in_indicator=value_in_indicator,
indicator_in_value=indicator_in_value)
def __init__(self, smtp_path, whitelist):
# Initiate logging.
self.logger = logging.getLogger()
# Save the whitelist.
self.whitelist = whitelist
# Items we parse out of the email.
self.ace_url = ''
self.attachments = []
self.body = ''
self.cc_addresses = []
self.envelope_from = ''
self.envelope_to = ''
self.from_address = ''
self.headers = ''
self.html = ''
self.indicators = []
self.message_id = ''
self.original_recipient = ''
self.path = smtp_path
self.received = ''
self.received_time = ''
self.remediated = False
self.reply_to = ''
self.return_path = ''
self.screenshots = []
self.subject = ''
self.subject_decoded = ''
self.to_addresses = []
self.urls = []
self.x_auth_id = ''
self.x_mailer = ''
self.x_original_sender = ''
self.x_originating_ip = ''
self.x_sender = ''
self.x_sender_id = ''
self.x_sender_ip = ''
# Build the URL to the ACE alert.
ace_uuid_pattern = re.compile(r'([a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12})')
match = ace_uuid_pattern.search(self.path)
if match:
self.ace_url = '{}{}'.format(config['ace']['ace_alert_url'], match.group(1))
with open(self.path, encoding='utf-8', errors='ignore') as s:
smtp_stream = s.read().splitlines()
# Locate any screenshots for this email.
email_dir = os.path.dirname(self.path)
files = os.listdir(email_dir)
for f in files:
if 'text_html' in f and f.endswith('.png') and not f.startswith('email_screenshot'):
self.logger.debug('Found email screenshot: {}'.format(os.path.join(email_dir, f)))
self.screenshots.append(os.path.join(email_dir, f))
# Find the envelope from/to addresses. This will only work if given an
# "smtp.stream" file, since otherwise the SMTP commands will not exist.
envelope_address_pattern = re.compile(r'.*<(.*)>.*')
for line in smtp_stream:
if line.startswith('MAIL FROM:'):
try:
self.envelope_from = envelope_address_pattern.match(line).group(1)
except:
self.logger.exception('Unable to parse envelope from.')
if line.startswith('RCPT TO:'):
try:
self.envelope_to = envelope_address_pattern.match(line).group(1)
except:
self.logger.exception('Unable to parse envelope to.')
# Just in case we are dealing with an "smtp.stream" file that still has
# the SMTP commands above the actual e-mail, we need to strip those out.
# This will remove all lines prior to the Received: headers so that the
# email.parser can properly parse out the e-mail. If we were given an
# "smtp.email" type of file with the SMTP commands already removed, this
# should not affect anything. This is legacy code at this point.
try:
while not smtp_stream[0].startswith('Received:'):
smtp_stream.pop(0)
except IndexError:
smtp_stream = []
# Join the header lines into a single string.
self.email_text = '\n'.join(smtp_stream)
# Create the e-mail object.
email_obj = email.message_from_string(self.email_text)
# We want to try and parse an embedded/attached e-mail if there is one.
# Walk the full e-mail's parts.
for part in email_obj.walk():
# Continue if the part looks like a valid e-mail.
if part.get_content_type() == 'message/rfc822':
# Split the part lines into a list.
part_text = str(part).splitlines()
if any('Received:' in line for line in part_text):
# Make sure our part starts with the Received: headers.
while not part_text[0].startswith('Received:'):
part_text.pop(0)
part_text = '\n'.join(part_text)
# Make the new e-mail object.
email_obj = email.message_from_string(part_text)
# Parse the e-mail object for its content.
parsed_email = self._parse_content(email_obj)
# Now that we have the e-mail object, parse out some of the interesting parts.
self.headers = self._get_all_headers_string(email_obj)
self.received = self.get_header(email_obj, 'received')
# Get the e-mail's plaintext body, HTML body, and the visible text from the HTML.
self.body = parsed_email['body']
self.html = parsed_email['html']
# Get any e-mail attachments.
self.attachments = parsed_email['attachments']
# From address
try:
self.from_address = self._get_address_list(email_obj, 'from')[0][1]
self.indicators.append(Indicator('Email - Address', self.from_address, tags=['from_address']))
except:
pass
# From domain
try:
self.indicators.append(Indicator('URI - Domain Name', self.from_address.split('@')[1], tags=['from_domain']))
except:
pass
# Reply-To address
try:
self.reply_to = self._get_address_list(email_obj, 'reply-to')[0][1]
self.indicators.append(Indicator('Email - Address', self.reply_to, tags=['reply_to']))
except:
pass
# X-Sender address
try:
self.x_sender = self._get_address_list(email_obj, 'X-Sender')[0][1]
self.indicators.append(Indicator('Email - Address', self.x_sender, tags=['x_sender']))
except:
pass
# X-Sender-Id address
try:
self.x_sender_id = self._get_address_list(email_obj, 'X-Sender-Id')[0][1]
self.indicators.append(Indicator('Email - Address', self.x_sender_id, tags=['x_sender_id']))
except:
pass
# X-Auth-Id address
try:
self.x_auth_id = self._get_address_list(email_obj, 'X-Auth-ID')[0][1]
self.indicators.append(Indicator('Email - Address', self.x_auth_id, tags=['x_auth_id']))
except:
pass
# Return-Path address
try:
self.return_path = self._get_address_list(email_obj, 'return_path')[0][1]
self.indicators.append(Indicator('Email - Address', self.return_path, tags=['return_path']))
except:
pass
# X-MS-Exchange-Organization-OriginalEnvelopeRecipients address
try:
self.original_recipient = self._get_address_list(email_obj, 'X-MS-Exchange-Organization-OriginalEnvelopeRecipients')[0][1].lower()
self.indicators.append(Indicator('Email - Address', self.original_recipient, status='Informational', tags=['original_recipient']))
except:
pass
# If the original_recipient was not found, check if this is a POTENTIAL PHISH e-mail and use the from address.
if not self.original_recipient and 'Subject: [POTENTIAL PHISH]' in self.email_text:
try:
temp_email_obj = email.message_from_string(self.email_text)
self.original_recipient = self._get_address_list(temp_email_obj, 'from')[0][1]
self.indicators.append(Indicator('Email - Address', self.original_recipient, status='Informational', tags=['original_recipient']))
except:
self.logger.exception('Error parsing original recipient from POTENTIAL PHISH e-mail.')
# Subject
try:
self.subject = ''.join(self.get_header(email_obj, 'subject')[0].splitlines())
self.indicators.append(Indicator('Email - Subject', self.subject))
except:
pass
# Decoded subject
try:
self.subject_decoded = ''.join(str(make_header(decode_header(self.get_header(email_obj, 'subject')[0]))).splitlines())
self.indicators.append(Indicator('Email - Subject', self.subject_decoded))
except:
pass
# To addresses
self.to_addresses = [x[1].lower() for x in self._get_address_list(email_obj, 'to')]
# CC addresses
self.cc_addresses = [x[1].lower() for x in self._get_address_list(email_obj, 'cc')]
# Message-Id
try:
self.message_id = self.get_header(email_obj, 'message-id')[0]
self.indicators.append(Indicator('Email Message ID', self.message_id, status='Informational'))
except:
pass
# X-Mailer
try:
self.x_mailer = self.get_header(email_obj, 'x-mailer')[0]
self.indicators.append(Indicator('Email - Xmailer', self.x_mailer, status='Informational'))
except:
pass
# X-Original-Sender address
try:
self.x_original_sender = self.get_header(email_obj, 'x-original-sender')[0]
self.indicators.append(Indicator('Email - Address', self.x_original_sender, tags=['x_original_sender']))
except:
pass
# X-Originating-Ip
try:
x_originating_ip = self.get_header(email_obj, 'x-originating-ip')[0]
# Sometimes this field is in the form: [1.1.1.1]
# Make sure we remove any non-IP characters.
ip = RegexHelpers.find_ip_addresses(x_originating_ip)
if ip:
self.x_originating_ip = ip[0]
self.indicators.append(Indicator('Address - ipv4-addr', self.x_originating_ip, tags=['x_originating_ip']))
except:
pass
# X-Sender-Ip
try:
x_sender_ip = self.get_header(email_obj, 'x-sender-ip')[0]
# Make sure like the X-Originating-IP that we only
# get the IP address and no other characters.
ip = RegexHelpers.find_ip_addresses(x_sender_ip)
if ip:
self.x_sender_ip = ip[0]
self.indicators.append(Indicator('Address - ipv4-addr', self.x_sender_ip, tags=['x_sender_ip']))
except:
pass
self.received_time = self._get_received_time(email_obj)
if not self.received_time:
self.received_time = self._get_date_time()
# Find any URLs in the plaintext body.
text_urls = find_urls(self.body)
# Find any URLs in the HTML body.
html_urls = find_urls(self.html)
# Get any strings URLs.
strings_urls = []
"""
for file in self.attachments:
try:
strings_urls += file['strings_urls']
except:
pass
"""
# Try and remove any URLs that look like partial versions of other URLs.
all_urls = text_urls + html_urls + strings_urls
unique_urls = set()
for u in all_urls:
if not any(other_url.startswith(u) and other_url != u for other_url in all_urls):
unique_urls.add(u)
# Get rid of any invalid URLs.
self.urls = [u for u in unique_urls if is_valid(u)]
# Make indicators for the URLs.
self.indicators += make_url_indicators(self.urls)
# Get rid of any invalid indicators.
self.indicators = [i for i in self.indicators if i.value]
# Add any extra tags to each indicator.
for i in self.indicators:
i.tags.append('phish')
def make_url_indicators(urls, tags=[]):
""" Make indicators from a list of URLs. """
logger = logging.getLogger(__name__)
if isinstance(urls, str):
urls = [urls]
indicators = []
for u in set(urls):
if is_valid(u):
parsed_url = urlsplit(u)
url_without_query = parsed_url.scheme + '://' + parsed_url.netloc + parsed_url.path
url_variations = set()
url_variations.add(u)
url_variations.add(url_without_query)
for u in url_variations:
"""
# If the URL is whitelisted, we want to make sure that we mark its component parts
# (the netloc and the path/query) as Informational. We don't want to mark them as
# Whitelisted since, for example, there can be cases where some URI paths from a
# given domain are good and others are not. (See: dropbox.com)
if whitelist.is_url_whitelisted(u):
status = 'Informational'
else:
status = 'New'
"""
status = 'New'
# Hacky way to deal with URLs that have a username:password notation.
user_pass_url = ''
parsed_url = urlsplit(u)
# First check if the netloc has a ':' in it, which indicates that
# there is a port number specified. We need to remove that in order
# to properly create indicators for it.
if ':' in parsed_url.netloc:
netloc = parsed_url.netloc.split(':')[0]
else:
netloc = parsed_url.netloc
# Look for the edge case of the URL having a username:password notation.
try:
if ':' in parsed_url.netloc and '@' in parsed_url.netloc:
user_pass = re.compile(r'(.*?:.*?@)').findall(
parsed_url.netloc)[0]
user_pass_url = u.replace(user_pass, '')
parsed_url = urlsplit(user_pass_url)
netloc = parsed_url.netloc
except:
pass
# Domain/IP
try:
ipaddress.ip_address(netloc)
indicators.append(
Indicator('Address - ipv4-addr',
netloc,
status=status,
tags=tags + ['ip_in_url'],
relationships=[u]))
except ValueError:
indicators.append(
Indicator('URI - Domain Name',
netloc,
status=status,
tags=tags + ['domain_in_url'],
relationships=[u]))
# TLD
tld = get_fld('http://{}'.format(netloc), fail_silently=True)
if tld:
indicators.append(
Indicator('URI - Domain Name',
tld,
status=status,
tags=tags,
relationships=[u]))
# Full URL
indicators.append(Indicator('URI - URL', u, tags=tags))
# Path
indicators.append(
Indicator('URI - Path',
parsed_url.path,
status=status,
tags=tags,
relationships=[u, parsed_url.netloc]))
try:
decoded_path = urllib.parse.unquote(parsed_url.path)
if not decoded_path == parsed_url.path:
indicators.append(
Indicator('URI - Path',
decoded_path,
status=status,
tags=tags,
relationships=[u, parsed_url.netloc]))
except:
pass
# Query
indicators.append(
Indicator('URI - Path',
parsed_url.query,
status=status,
tags=tags,
relationships=[u, parsed_url.netloc]))
good_indicators = [i for i in set(indicators) if i.value]
return good_indicators