def _make_stix_package_for_attached_file(self, file_, feed):
# package ID作成
package_id = self.generator.create_id(prefix='Package')
# 添付ファイルの中身を読み込み base64 で encode
with open(file_.file_path, 'rb') as fp:
content = base64.b64encode(fp.read())
# content作成
marking_specification_content = self._make_marking_specification_statement(
MARKING_STRUCTURE_STIP_ATTACHEMENT_CONTENT_PREFIX,
content.decode('utf-8'))
# filename作成
marking_specification_file_name = self._make_marking_specification_statement(
MARKING_STRUCTURE_STIP_ATTACHEMENT_FILENAME_PREFIX,
file_.file_name)
# header 作成
stix_header = STIXHeader()
stix_header.handling = self._get_stix_header_marking(feed)
stix_header.handling.add_marking(marking_specification_content)
stix_header.handling.add_marking(marking_specification_file_name)
stix_header.title = file_.file_name
stix_header.description = 'File "%s" encoded in BASE64.' % (
file_.file_name)
# Information Source 格納
stix_header.information_source = self._make_information_source()
# package作成
stix_package = STIXPackage(id_=package_id)
stix_package.timestamp = datetime.datetime.now(
tz=pytz.timezone(feed.user.timezone))
stix_package.stix_header = stix_header
return stix_package
def _make_stix_package(self, origin_feed, post, creator=None):
# package ID作成
package_id = self.generator.create_id(prefix='Package')
# package作成
stix_package = STIXPackage(id_=package_id)
stix_package.timestamp = datetime.datetime.now(tz=pytz.timezone(origin_feed.user.timezone))
# header格納
stix_package.stix_header = self._get_stix_header(origin_feed, post, creator)
# Comment元の Feed の Package ID を Related Package に追加する
stix_package.add_related_package(origin_feed.package_id)
return stix_package
def _make_stix_package(self, feed, indicators=[], ttps=[], tas=[]):
user_timezone = pytz.timezone(feed.user.timezone)
# package ID作成
package_id = self.generator.create_id(prefix='Package')
# package作成
stix_package = STIXPackage(id_=package_id)
stix_package.timestamp = datetime.datetime.now(tz=user_timezone)
# header格納
stix_package.stix_header = self._get_stix_header(feed)
# indicators 格納
# web 画面から取得した indicators (json) から stix indicators 作成する
stix_indicators = Indicators()
for indicator_json in indicators:
indicator = CommonExtractor.get_indicator_from_json(
indicator_json, user_timezone)
if indicator is not None:
stix_indicators.append(indicator)
stix_package.indicators = stix_indicators
# ExploitTargets格納
stix_exploit_targets = ExploitTargets()
for ttp_json in ttps:
et = CommonExtractor.get_exploit_target_from_json(ttp_json)
if et is not None:
stix_exploit_targets.append(et)
stix_package.exploit_targets = stix_exploit_targets
# ThreatActors 格納
for ta_json in tas:
value = ta_json['value']
if SNSConfig.get_cs_custid(
) is not None and SNSConfig.get_cs_custkey() is not None:
ta = self.get_ta_from_crowd_strike(value)
if ta is None:
# ATT&CK から ThreatActor 取得する
ta = self.get_ta_from_attck(value)
else:
ta = self.get_ta_from_attck(value)
stix_package.add_threat_actor(ta)
# 添付ファイル用の STIX 作成する
for file_ in feed.files.all():
attach_file_stix_package = self._make_stix_package_for_attached_file(
file_, feed)
self.attachment_files.append(attach_file_stix_package)
# 添付ファイル用の STIX を Related Pacakge に追加する
stix_package.add_related_package(attach_file_stix_package.id_)
return stix_package
def transform(data, new_only=True):
"""
transform - The transforms are source specific.
Source: http://www.malwaredomainlist.com/hostslist/mdl.xml
data - must be source xml converted to a dictionary
:param data:
:param new_only:
:return:
"""
# Input validation
if not isinstance(data, dict):
return False
work = []
history = db('local_file', 'history', ADPTR_SRC_ID)
value2key = db('local_file', 'value_to_key', 'values')
items = data.get('rss', {}).get('channel', {}).get('item')
if items:
for item in items:
guid = item.get('guid', {}).get('#text')
if guid:
# Check to see if this item has been process before
# if not, add to work
if guid in history:
if not new_only:
work.append(item)
else:
work.append(item)
db('local_file', 'history', ADPTR_SRC_ID,
{guid: {
'date': str(datetime.now())
}})
if work:
### Generate STIXPackage and STIXHeader
set_ns_stix(ADPTR_NS_STIX)
set_ns_cybox(ADPTR_NS_CYBOX)
STIXPackage._version = ADPTR_VER_STIX
pkg = STIXPackage()
src_info, value2key = gen_info_src({}, 'www.malwaredomainlist.com',
value2key)
hdr = STIXHeader()
hdr.title = data.get('rss', {}).get('channel', {}).get('title')
hdr.description = data.get('rss', {}).get('channel',
{}).get('description')
hdr.information_source = src_info
pkg.stix_header = hdr
for item in work:
key = item.get('guid', {}).get('#text')
# Decompose data description
tmp = [x.strip() for x in item.get('description').split(',')]
decomp = {}
for x in tmp:
k, v = x.split(':')
decomp.update({k.strip(): v.strip()})
# Generate STIX Indicator
ind, history = gen_indicator(item, key, history)
ind.producer = src_info
ind.short_description = 'MDL RefID: %s | %s' % (
key, decomp.get('Description'))
# Decompose host
host = decomp.get('Host')
uri = None
file_ = None
if '/' in host:
host, uri = host.split('/', 1)
# TODO: parse out file Name
if host: # Generate Cybox HostName
obj = Hostname()
obj.is_domain_name = True
obj.naming_system = 'DNS'
obj.hostname_value = host
ob, value2key = gen_CyboxOb(obj, host, value2key)
ob.title = 'HostName: %s' % obj.hostname_value
ind.add_observable(CyboxOb(idref=ob.id_))
pkg.add_observable(ob)
if uri: # Generate Cybox URI
obj = URI()
obj.type_ = URI.TYPE_URL
url = AnyURI('%s/%s' % (host, uri))
obj.value = url
ob, value2key = gen_CyboxOb(obj, url, value2key)
ob.title = 'URL: %s' % url
ind.add_observable(CyboxOb(idref=ob.id_))
pkg.add_observable(ob)
if file_:
obj = File()
ip = decomp.get('IP address')
if ip:
obj_ip = Address()
if isIPv4(ip):
obj_ip.category = Address.CAT_IPV4
elif isIPv6(ip):
obj_ip.category = Address.CAT_IPV6
else:
break
obj_ip.is_source = True
obj_ip.address_value = ip
# if obj_host:
# obj_ip.add_related(obj_host,
# ObjectRelationship.TERM_RESOLVED_TO,
# inline=False)
ob = CyboxOb(obj_ip)
ob.title = 'IP: %s' % ip
ind.add_observable(CyboxOb(idref=ob.id_))
pkg.add_observable(ob)
asn = decomp.get('ASN')
if asn:
obj_asn = Address()
obj_asn.category = Address.CAT_ASN
obj_asn.address_value = asn
# if obj_host:
# obj_asn.add_related(obj_host,
# ObjectRelationship.TERM_CONNECTED_TO,
# inline=False)
# if obj_ip:
# obj_asn.add_related(obj_ip,
# ObjectRelationship.TERM_CONNECTED_TO,
# inline=False)
ob = CyboxOb(obj_asn)
ob.title = 'ASN: %s' % ip
ind.add_observable(CyboxOb(idref=ob.id_))
pkg.add_observable(ob)
pkg.add_indicator(ind)
db('local_file', 'value_to_key', 'values', value2key)
db('local_file', 'history', ADPTR_SRC_ID, history)
return pkg