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Merge pull request #1301 from malinkinsa/dfir-iris
Add alerter for IRIS IRP system
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,187 @@ | ||
| import requests | ||
| import uuid | ||
|
|
||
| from datetime import datetime | ||
| from requests import RequestException | ||
|
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| from elastalert.alerts import Alerter | ||
| from elastalert.util import EAException, elastalert_logger, lookup_es_key | ||
|
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| class IrisAlerter(Alerter): | ||
| required_options = set(['iris_host', 'iris_api_token', 'iris_customer_id']) | ||
|
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| def __init__(self, rule): | ||
| super(IrisAlerter, self).__init__(rule) | ||
| self.url = f"https://{self.rule.get('iris_host')}" | ||
| self.api_token = self.rule.get('iris_api_token') | ||
| self.customer_id = self.rule.get('iris_customer_id') | ||
| self.ca_cert = self.rule.get('iris_ca_cert', False) | ||
| self.ignore_ssl_errors = self.rule.get('iris_ignore_ssl_errors', False) | ||
| self.description = self.rule.get('iris_description', None) | ||
| self.overwrite_timestamp = self.rule.get('iris_overwrite_timestamp', False) | ||
| self.type = self.rule.get('iris_type', 'alert') | ||
| self.case_template_id = self.rule.get('iris_case_template_id', None) | ||
| self.headers = { | ||
| 'Content-Type': 'application/json', | ||
| 'Authorization': f'Bearer {self.rule.get("iris_api_token")}' | ||
| } | ||
| self.alert_note = self.rule.get('iris_alert_note', None) | ||
| self.alert_tags = self.rule.get('iris_alert_tags', None) | ||
| self.alert_status_id = self.rule.get('iris_alert_status_id', 2) | ||
| self.alert_source_link = self.rule.get('iris_alert_source_link', None) | ||
| self.alert_severity_id = self.rule.get('iris_alert_severity_id', 1) | ||
| self.alert_context = self.rule.get('iris_alert_context', None) | ||
| self.iocs = self.rule.get('iris_iocs', None) | ||
|
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| def make_alert_context_records(self, matches): | ||
| alert_context = {} | ||
|
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| for key, value in self.alert_context.items(): | ||
| alert_context.update( | ||
| { | ||
| key: matches[0].get(value) | ||
| } | ||
| ) | ||
|
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| return alert_context | ||
|
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| def make_iocs_records(self, matches): | ||
| iocs = [] | ||
| for record in self.iocs: | ||
| record['ioc_value'] = lookup_es_key(matches[0], record['ioc_value']) | ||
| iocs.append(record) | ||
| return iocs | ||
|
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| def make_alert(self, matches): | ||
| if self.overwrite_timestamp: | ||
| event_timestamp = matches[0].get('@timestamp') | ||
| else: | ||
| event_timestamp = datetime.now().strftime("%Y-%m-%dT%H:%M:%S") | ||
|
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| alert_data = { | ||
| "alert_title": self.rule.get('name'), | ||
| "alert_description": self.description, | ||
| "alert_source": "ElastAlert2", | ||
| "alert_severity_id": self.alert_severity_id, | ||
| "alert_status_id": self.alert_status_id, | ||
| "alert_source_event_time": event_timestamp, | ||
| "alert_note": self.alert_note, | ||
| "alert_tags": self.alert_tags, | ||
| "alert_customer_id": self.customer_id, | ||
| } | ||
|
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||
| if self.alert_source_link: | ||
| alert_data.update( | ||
| {"alert_source_link": self.alert_source_link} | ||
| ) | ||
|
|
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| if self.iocs: | ||
| iocs = self.make_iocs_records(matches) | ||
| alert_data.update( | ||
| {"alert_iocs": iocs} | ||
| ) | ||
|
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| if self.alert_context: | ||
| alert_context = self.make_alert_context_records(matches) | ||
| alert_data.update( | ||
| {"alert_context": alert_context} | ||
| ) | ||
|
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| return alert_data | ||
|
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| def make_case(self, matches): | ||
| iocs = [] | ||
| case_data = { | ||
| "case_soc_id": f"SOC_{str(uuid.uuid4())[0:6]}", | ||
| "case_customer": self.customer_id, | ||
| "case_name": self.rule.get('name'), | ||
| "case_description": self.description | ||
| } | ||
|
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| if self.iocs: | ||
| iocs = self.make_iocs_records(matches) | ||
|
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| if self.case_template_id: | ||
| case_data.update( | ||
| {"case_template_id": self.case_template_id} | ||
| ) | ||
|
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| return case_data, iocs | ||
|
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| def alert(self, matches): | ||
| if self.ca_cert: | ||
| verify = self.ca_cert | ||
| else: | ||
| verify = False | ||
|
|
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| if self.ignore_ssl_errors: | ||
| requests.packages.urllib3.disable_warnings() | ||
|
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| if 'alert' in self.type: | ||
| alert_data = self.make_alert(matches) | ||
|
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| try: | ||
| alert_response = requests.post( | ||
| url=f'{self.url}/alerts/add', | ||
| headers=self.headers, | ||
| json=alert_data, | ||
| verify=verify, | ||
| ) | ||
|
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| if alert_response.status_code != 200: | ||
| raise EAException(f"Cannot create a new alert: {alert_response.status_code}") | ||
|
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| except RequestException as e: | ||
| raise EAException(f"Error posting alert to Iris: {e}") | ||
| elastalert_logger.info('Alert sent to Iris') | ||
|
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| elif 'case' in self.type: | ||
| case_data, iocs = self.make_case(matches) | ||
|
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| try: | ||
| case_response = requests.post( | ||
| url=f'{self.url}/manage/cases/add', | ||
| headers=self.headers, | ||
| json=case_data, | ||
| verify=verify, | ||
| ) | ||
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| if case_response.status_code == 200: | ||
| case_response_data = case_response.json() | ||
| case_id = case_response_data.get('data', '').get('case_id') | ||
| for ioc in iocs: | ||
| ioc.update( | ||
| { | ||
| "cid": case_id | ||
| } | ||
| ) | ||
|
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||
| try: | ||
| response_ioc = requests.post( | ||
| url=f'{self.url}/case/ioc/add', | ||
| headers=self.headers, | ||
| json=ioc, | ||
| verify=verify, | ||
| ) | ||
|
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| if response_ioc.status_code != 200: | ||
| raise EAException(f"Unable to add a new IOC to the case {case_id}") | ||
|
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| except RequestException as e: | ||
| raise EAException(f"Error when adding IOC to the case {case_id}: {e}") | ||
| elastalert_logger.info('IOCs successfully added to the case') | ||
|
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| else: | ||
| raise EAException(f'Cannot create a new case: {case_response.status_code}') | ||
|
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| except RequestException as e: | ||
| raise EAException(f"Error posting the case to Iris: {e}") | ||
| elastalert_logger.info('Case successfully created in Iris') | ||
|
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||
| def get_info(self): | ||
| return { | ||
| 'type': 'IrisAlerter', | ||
| 'iris_api_endpoint': self.url | ||
| } |
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