def search_file(self, filepath):
fp = open(filepath, 'rb')
sha256 = hashlib.sha256(fp.read()).hexdigest()
fp.close()
triage_client = Client(self.apikey, root_url=self.api_endpoint)
response = triage_client.search(sha256, max=1)
try:
for item in response:
self.task_id = item['id']
self.log("debug", "Found existing report.")
except:
self.log("debug", "No reports found. Submitting file.")
self.submit_file(filepath)
class HatchingTriageSandboxConnector:
def __init__(self):
# Instantiate the connector helper from config
config_file_path = os.path.dirname(os.path.abspath(__file__)) + "/config.yml"
config = (
yaml.load(open(config_file_path), Loader=yaml.FullLoader)
if os.path.isfile(config_file_path)
else {}
)
self.helper = OpenCTIConnectorHelper(config)
self.identity = self.helper.api.identity.create(
type="Organization",
name="Hatching Triage",
description="Hatching Triage",
)["standard_id"]
self.octi_api_url = get_config_variable(
"OPENCTI_URL", ["opencti", "url"], config
)
# Get URL and token from config, use to instantiate the Triage Client
base_url = get_config_variable(
"HATCHING_TRIAGE_SANDBOX_BASE_URL",
["hatching_triage_sandbox", "base_url"],
config,
)
token = get_config_variable(
"HATCHING_TRIAGE_SANDBOX_TOKEN",
["hatching_triage_sandbox", "token"],
config,
)
self.triage_client = Client(token, root_url=base_url)
# Get other config values
self.use_existing_analysis = get_config_variable(
"HATCHING_TRIAGE_SANDBOX_USE_EXISTING_ANALYSIS",
["hatching_triage_sandbox", "use_existing_analysis"],
config,
)
self.family_color = get_config_variable(
"HATCHING_TRIAGE_SANDBOX_FAMILY_COLOR",
["hatching_triage_sandbox", "family_color"],
config,
)
self.botnet_color = get_config_variable(
"HATCHING_TRIAGE_SANDBOX_BOTNET_COLOR",
["hatching_triage_sandbox", "botnet_color"],
config,
)
self.campaign_color = get_config_variable(
"HATCHING_TRIAGE_SANDBOX_CAMPAIGN_COLOR",
["hatching_triage_sandbox", "campaign_color"],
config,
)
self.default_tag_color = get_config_variable(
"HATCHING_TRIAGE_SANDBOX_TAG_COLOR",
["hatching_triage_sandbox", "tag_color"],
config,
)
self.max_tlp = get_config_variable(
"HATCHING_TRIAGE_SANDBOX_MAX_TLP",
["hatching_triage_sandbox", "max_tlp"],
config,
)
def _process_overview_report(self, observable, overview_dict, sample_id):
bundle_objects = []
# Create external reference
# Analysis URL
external_reference = self.helper.api.external_reference.create(
source_name="Hatching Triage Sandbox Analysis",
url=f"https://tria.ge/{sample_id}/",
description="Hatching Triage Sandbox Analysis",
)
self.helper.api.stix_cyber_observable.add_external_reference(
id=observable["id"],
external_reference_id=external_reference["id"],
)
# Create labels from the tags
if "tags" in overview_dict["analysis"]:
for tag in overview_dict["analysis"]["tags"]:
# Set the label color depending on tag type
# Note: Only certain tags are separated by a colon
# Those are the tags we are colorizing
tag_split = tag.split(":")
tag_value = tag
label_color = self.default_tag_color
if len(tag_split) == 2:
if "family" == tag_split[0]:
label_color = self.family_color
elif "botnet" == tag_split[0]:
label_color = self.botnet_color
elif "campaign" == tag_split[0]:
label_color = self.campaign_color
tag_value = tag_split[1]
# Create and add the label
label = self.helper.api.label.create(value=tag_value, color=label_color)
self.helper.api.stix_cyber_observable.add_label(
id=observable["id"], label_id=label["id"]
)
# Create default labels
self.helper.api.label.create(value="c2 server", color=self.default_tag_color)
self.helper.api.label.create(value="credentials", color=self.default_tag_color)
self.helper.api.label.create(value="dynamic", color=self.default_tag_color)
extracted_label = self.helper.api.label.create(
value="extracted", color=self.default_tag_color
)
self.helper.api.label.create(value="dropper", color=self.default_tag_color)
# Process extracted key
extracted_list = overview_dict.get("extracted", [])
for extracted_dict in extracted_list:
# Handle config
if "config" in extracted_dict:
if "rule" not in extracted_dict["config"]:
self.helper.api.log_info("rule key not found, skipping...")
continue
# Create a Note
config_json = json.dumps(extracted_dict, indent=2)
config_rule = extracted_dict["config"]["rule"]
note = Note(
abstract=f"{config_rule} Config",
content=f"```\n{config_json}\n```",
created_by_ref=self.identity,
object_refs=[observable["standard_id"]],
)
bundle_objects.append(note)
# Create Observables and Relationships for C2s
c2_list = extracted_dict.get("config").get("c2", [])
for c2 in c2_list:
# Differentiate between C2 IP and URL
parsed = c2.split(":")[0]
key = "Url"
relationship_type = "communicates-with"
if self._is_ipv4_address(parsed):
key = "IPv4-Addr"
else:
parsed = c2
relationship_type = "related-to"
host_stix = SimpleObservable(
id=OpenCTIStix2Utils.generate_random_stix_id(
"x-opencti-simple-observable"
),
labels=[config_rule, "c2 server"],
key=f"{key}.value",
value=parsed,
created_by_ref=self.identity,
)
relationship = Relationship(
id=OpenCTIStix2Utils.generate_random_stix_id("relationship"),
relationship_type=relationship_type,
created_by_ref=self.identity,
source_ref=observable["standard_id"],
target_ref=host_stix.id,
allow_custom=True,
)
bundle_objects.append(host_stix)
bundle_objects.append(relationship)
# Create Observables and Relationships for credentials
creds_list = extracted_dict.get("config").get("credentials", [])
for cred_dict in creds_list:
host = cred_dict.get("host", None)
username = cred_dict.get("username")
protocol = cred_dict.get("protocol")
if host:
# Add Host Observable
host_stix = SimpleObservable(
id=OpenCTIStix2Utils.generate_random_stix_id(
"x-opencti-simple-observable"
),
labels=[config_rule, "credentials"],
key="X-OpenCTI-Hostname.value",
value=host,
created_by_ref=self.identity,
)
relationship = Relationship(
id=OpenCTIStix2Utils.generate_random_stix_id(
"relationship"
),
relationship_type="related-to",
created_by_ref=self.identity,
source_ref=observable["standard_id"],
target_ref=host_stix.id,
allow_custom=True,
)
bundle_objects.append(host_stix)
bundle_objects.append(relationship)
if protocol == "smtp" and username:
# Add Email Address Observable
email_stix = SimpleObservable(
id=OpenCTIStix2Utils.generate_random_stix_id(
"x-opencti-simple-observable"
),
labels=[config_rule, "credentials"],
key="Email-Addr.value",
value=username,
created_by_ref=self.identity,
)
relationship = Relationship(
id=OpenCTIStix2Utils.generate_random_stix_id(
"relationship"
),
relationship_type="related-to",
created_by_ref=self.identity,
source_ref=observable["standard_id"],
target_ref=email_stix.id,
allow_custom=True,
)
bundle_objects.append(email_stix)
bundle_objects.append(relationship)
# Download task file, wait for it to become available
# Give up after 5 tries
task_id = extracted_dict["tasks"][0]
filename = extracted_dict["dumped_file"]
file_contents = self.triage_client.sample_task_file(
sample_id, task_id, filename
)
for x in range(5):
# Sample not yet available, sleep
if b"NOT_AVAILABLE" in file_contents[:30]:
time.sleep(10)
continue
file_contents = self.triage_client.sample_task_file(
sample_id, task_id, filename
)
if b"NOT_AVAILABLE" in file_contents[:30]:
self.helper.api.log_info(
"Maximum attempts tried to obtain extracted file, skipping..."
)
continue
# Upload task file to OpenCTI
mime_type = magic.from_buffer(file_contents, mime=True)
kwargs = {
"file_name": f"{sample_id}_{filename}",
"data": file_contents,
"mime_type": mime_type,
"x_opencti_description": f"Extracted file from sample ID {sample_id} and task ID {task_id}.",
}
response = self.helper.api.stix_cyber_observable.upload_artifact(
**kwargs
)
# Create Relationship between original Observable and the extracted
relationship = Relationship(
id=OpenCTIStix2Utils.generate_random_stix_id("relationship"),
relationship_type="related-to",
created_by_ref=self.identity,
source_ref=response["standard_id"],
target_ref=observable["standard_id"],
allow_custom=True,
)
bundle_objects.append(relationship)
# Create and apply labels to extracted file
label = self.helper.api.label.create(
value=config_rule, color=self.family_color
)
self.helper.api.stix_cyber_observable.add_label(
id=response["id"], label_id=label["id"]
)
self.helper.api.stix_cyber_observable.add_label(
id=response["id"], label_id=extracted_label["id"]
)
# Handle dropper
if "dropper" in extracted_dict:
dropper_dict = extracted_dict["dropper"]
# Create Url Observables and Relationships
dropper_urls = dropper_dict["urls"]
for url_dict in dropper_urls:
dropper_type = url_dict["type"]
url = url_dict["url"]
url_stix = SimpleObservable(
id=OpenCTIStix2Utils.generate_random_stix_id(
"x-opencti-simple-observable"
),
labels=[dropper_type],
key="Url.value",
value=url.rstrip(),
created_by_ref=self.identity,
object_marking_refs=[TLP_WHITE],
)
relationship = Relationship(
id=OpenCTIStix2Utils.generate_random_stix_id("relationship"),
relationship_type="related-to",
created_by_ref=self.identity,
source_ref=observable["standard_id"],
target_ref=url_stix.id,
allow_custom=True,
)
bundle_objects.append(url_stix)
bundle_objects.append(relationship)
# Create dropper type label
self.helper.api.label.create(
value=dropper_type, color=self.default_tag_color
)
# Attach domains
domains = [
task_dict.get("iocs", {}).get("domains", [])
for task_dict in overview_dict["targets"]
]
for domain in domains[0]:
domain_stix = SimpleObservable(
id=OpenCTIStix2Utils.generate_random_stix_id(
"x-opencti-simple-observable"
),
labels=["dynamic"],
key="Domain-Name.value",
value=domain,
created_by_ref=self.identity,
object_marking_refs=[TLP_WHITE],
)
relationship = Relationship(
id=OpenCTIStix2Utils.generate_random_stix_id("relationship"),
relationship_type="communicates-with",
created_by_ref=self.identity,
source_ref=observable["standard_id"],
target_ref=domain_stix.id,
allow_custom=True,
)
bundle_objects.append(domain_stix)
bundle_objects.append(relationship)
# Attach IP addresses
ips = [
task_dict.get("iocs", {}).get("ips", [])
for task_dict in overview_dict["targets"]
]
for ip in ips[0]:
# Filter out non-global and known DNS IPs
if not ipaddress.ip_address(ip).is_global:
continue
if ip in ["8.8.8.8", "8.8.4.4"]:
continue
host_stix = SimpleObservable(
id=OpenCTIStix2Utils.generate_random_stix_id(
"x-opencti-simple-observable"
),
labels=["dynamic"],
key="IPv4-Addr.value",
value=ip,
created_by_ref=self.identity,
)
relationship = Relationship(
id=OpenCTIStix2Utils.generate_random_stix_id("relationship"),
relationship_type="communicates-with",
created_by_ref=self.identity,
source_ref=observable["standard_id"],
target_ref=host_stix.id,
allow_custom=True,
)
bundle_objects.append(host_stix)
bundle_objects.append(relationship)
# Attach the TTPs
if "signatures" in overview_dict:
for signature_dict in overview_dict["signatures"]:
# Skip any dicts without a ttps key
if "ttp" not in signature_dict:
continue
name = signature_dict["name"]
ttps = signature_dict["ttp"]
for ttp in ttps:
attack_pattern = AttackPattern(
id=OpenCTIStix2Utils.generate_random_stix_id("attack-pattern"),
created_by_ref=self.identity,
name=name,
custom_properties={
"x_mitre_id": ttp,
},
object_marking_refs=[TLP_WHITE],
)
relationship = Relationship(
id=OpenCTIStix2Utils.generate_random_stix_id("relationship"),
relationship_type="uses",
created_by_ref=self.identity,
source_ref=observable["standard_id"],
target_ref=attack_pattern.id,
object_marking_refs=[TLP_WHITE],
allow_custom=True,
)
bundle_objects.append(attack_pattern)
bundle_objects.append(relationship)
# Serialize and send all bundles
if bundle_objects:
bundle = Bundle(objects=bundle_objects, allow_custom=True).serialize()
bundles_sent = self.helper.send_stix2_bundle(bundle)
return f"Sent {len(bundles_sent)} stix bundle(s) for worker import"
else:
return "Nothing to attach"
def _process_file(self, observable):
self.helper.log_info("Triggering the sandbox...")
if not observable["importFiles"]:
raise ValueError(f"No files found for {observable['observable_value']}")
# Build the URI to download the file
file_name = observable["importFiles"][0]["name"]
file_id = observable["importFiles"][0]["id"]
file_uri = f"{self.octi_api_url}/storage/get/{file_id}"
file_content = self.helper.api.fetch_opencti_file(file_uri, True)
sha256 = self._get_sha256(file_content)
sample_id = None
if self.use_existing_analysis:
# Perform a search of the sha256 to see if there's any existing analyses
search_paginator = self.triage_client.search(f"sha256:{sha256}", max=1)
for search in search_paginator:
existing_status = search["status"]
if existing_status == "reported":
sample_id = search["id"]
self.helper.log_info(
f"Found existing analysis with id {sample_id} and status {existing_status}."
)
elif existing_status == "pending":
sample_id = search["id"]
self.helper.log_info(
f"Found existing analysis with id {sample_id} and status {existing_status}."
)
self._wait_for_analysis(sample_id)
# Don't paginate, just get the first result
break
if sample_id is None:
file_obj = io.BytesIO(file_content)
sample_json = self.triage_client.submit_sample_file(file_name, file_obj)
sample_id = sample_json["id"]
sample_status = sample_json["status"]
self.helper.log_info(
f'Started new analysis {sample_id}, has status "{sample_status}".'
)
self._wait_for_analysis(sample_id)
# Get the Overview report
overview_dict = self.triage_client.overview_report(sample_id)
return self._process_overview_report(observable, overview_dict, sample_id)
def _process_observable(self, observable):
self.helper.log_info(
"Processing the observable " + observable["observable_value"]
)
# If File, Artifact
if observable["entity_type"] == "Artifact":
return self._process_file(observable)
else:
raise ValueError(
f"Failed to process observable, {observable['entity_type']} is not a supported entity type."
)
def _process_message(self, data):
entity_id = data["entity_id"]
observable = self.helper.api.stix_cyber_observable.read(id=entity_id)
if observable is None:
raise ValueError(
"Observable not found "
"(may be linked to data seggregation, check your group and permissions)"
)
# Extract TLP
tlp = "TLP:WHITE"
for marking_definition in observable["objectMarking"]:
if marking_definition["definition_type"] == "TLP":
tlp = marking_definition["definition"]
if not OpenCTIConnectorHelper.check_max_tlp(tlp, self.max_tlp):
raise ValueError(
"Do not send any data, TLP of the observable is greater than MAX TLP"
)
return self._process_observable(observable)
def _wait_for_analysis(self, sample_id):
"""
Wait for an analysis to finish.
sample_id: a str representing the sample id
returns: none
"""
for events in self.triage_client.sample_events(sample_id):
if events["status"] == "pending":
self.helper.log_info(
f"Analysis {sample_id} has status \"{events['status']}\"."
)
elif events["status"] == "reported":
self.helper.log_info(f"Analysis {sample_id} has finished.")
break
elif events["status"] == "failed":
raise ValueError(f"Analysis {sample_id} failed.")
def _get_sha256(self, contents):
"""
Return sha256 of bytes.
contents: a bytes object to get the sha256 for
returns: a str of the sha256
"""
sha256obj = sha256()
sha256obj.update(contents)
return sha256obj.hexdigest()
def _is_ipv4_address(self, ip):
m = re.match(r"^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$", ip)
return bool(m) and all(map(lambda n: 0 <= int(n) <= 255, m.groups()))
# Start the main loop
def start(self):
self.helper.listen(self._process_message)