feat(Google Threat Intelligence): Add more attributes to the GTI enrichment

misp_modules/modules/expansion/google_threat_intelligence.py

@@ -34,7 +34,7 @@
 }
 
 MODULE_INFO = {
-    'version': '1',
+    'version': '2',
     'author': 'Google Threat Intelligence team',
     'description': ('An expansion module to have the observable\'s threat'
                     ' score assessed by Google Threat Intelligence.'),
@@ -68,10 +68,23 @@ def __init__(self, client: vt.Client, limit: int) -> None:
             'md5': self.parse_hash,
             'sha1': self.parse_hash,
             'sha256': self.parse_hash,
-            'url': self.parse_url
+            'url': self.parse_url,
+            'ip-src|port': self.parse_ip_port,
+            'ip-dst|port': self.parse_ip_port,
         }
         self.proxies = None
 
+    @staticmethod
+    def get_total_analysis(analysis: dict,
+                           known_distributors: dict = None) -> int:
+        """Get total """
+        if not analysis:
+            return 0
+        count = sum([analysis['undetected'],
+                     analysis['suspicious'],
+                     analysis['harmless']])
+        return count if known_distributors else count + analysis['malicious']
+
     def query_api(self, attribute: dict) -> None:
         """Get data from the API and parse it."""
         self.attribute.from_dict(**attribute)
@@ -86,86 +99,205 @@ def get_results(self) -> dict:
         }
         return {'results': results}
 
-    def create_gti_report_object(self, report):
-        """Create GTI report object."""
-        report = report.to_dict()
-        permalink = ('https://www.virustotal.com/gui/'
-                     f"{report['type']}/{report['id']}")
-        report_object = pymisp.MISPObject('Google-Threat-Intel-report')
-        report_object.add_attribute('permalink', type='link', value=permalink)
-        report_object.add_attribute(
-            'Threat Score', type='text',
-            value=get_key(
-                report, 'attributes.gti_assessment.threat_score.value'))
-        report_object.add_attribute(
-            'Verdict', type='text',
-            value=get_key(
-                report, 'attributes.gti_assessment.verdict.value').replace(
+
+    def add_gti_report(self, report: vt.Object) -> str:
+        analysis = report.get('last_analysis_stats')
+        total = self.get_total_analysis(analysis,
+                                        report.get('known_distributors'))
+        if report.type == 'ip_address':
+            rtype = 'ip-address'
+        else:
+            rtype = report.type
+        permalink = f'https://www.virustotal.com/gui/{rtype}/{report.id}'
+
+        gti_object = pymisp.MISPObject('google-threat-intelligence-report')
+        gti_object.add_attribute('permalink', type='link', value=permalink)
+        ratio = f"{analysis['malicious']}/{total}" if analysis else '-/-'
+        gti_object.add_attribute('detection-ratio',
+                                type='text',
+                                value=ratio,
+                                disable_correlation=True)
+        report_dict = report.to_dict()
+        gti_object.add_attribute(
+            'threat-score', type='text',
+            value=get_key(report_dict,
+                          'attributes.gti_assessment.threat_score.value'))
+        gti_object.add_attribute(
+            'verdict', type='text',
+            value=get_key(report_dict,
+                          'attributes.gti_assessment.verdict.value').replace(
                     'VERDICT_', ''))
-        report_object.add_attribute(
-            'Severity', type='text',
-            value=get_key(
-                report, 'attributes.gti_assessment.severity.value').replace(
+        gti_object.add_attribute(
+            'severity', type='text',
+            value=get_key(report_dict,
+                          'attributes.gti_assessment.severity.value').replace(
                     'SEVERITY_', ''))
-        report_object.add_attribute(
-            'Threat Label', type='text',
-            value=get_key(
-                report, ('attributes.popular_threat_classification'
-                         '.suggested_threat_label')))
-        self.misp_event.add_object(**report_object)
-        return report_object.uuid
+        self.misp_event.add_object(**gti_object)
+        return gti_object.uuid
+
+    def create_misp_object(self, report: vt.Object) -> pymisp.MISPObject:
+        misp_object = None
+        gti_uuid = self.add_gti_report(report)
+
+        if report.type == 'file':
+            misp_object = pymisp.MISPObject('file')
+            for hash_type in ('md5', 'sha1', 'sha256', 'tlsh',
+                              'vhash', 'ssdeep', 'imphash'):
+                misp_object.add_attribute(hash_type,
+                                          **{'type': hash_type,
+                                             'value': report.get(hash_type)})
+        elif report.type == 'domain':
+            misp_object = pymisp.MISPObject('domain-ip')
+            misp_object.add_attribute('domain', type='domain', value=report.id)
+        elif report.type == 'ip_address':
+            misp_object = pymisp.MISPObject('domain-ip')
+            misp_object.add_attribute('ip', type='ip-dst', value=report.id)
+        elif report.type == 'url':
+            misp_object = pymisp.MISPObject('url')
+            misp_object.add_attribute('url', type='url', value=report.id)
+        misp_object.add_reference(gti_uuid, 'analyzed-with')
+        return misp_object
 
     def parse_domain(self, domain: str) -> str:
-        """Create domain MISP object."""
         domain_report = self.client.get_object(f'/domains/{domain}')
 
         # DOMAIN
-        domain_object = pymisp.MISPObject('domain-ip')
-        domain_object.add_attribute(
-            'domain', type='domain', value=domain_report.id)
+        domain_object = self.create_misp_object(domain_report)
+
+        # WHOIS
+        if domain_report.whois:
+            whois_object = pymisp.MISPObject('whois')
+            whois_object.add_attribute('text', type='text',
+                                       value=domain_report.whois)
+            self.misp_event.add_object(**whois_object)
+
+        # SIBLINGS AND SUBDOMAINS
+        for relationship_name, misp_name in [
+            ('siblings', 'sibling-of'), ('subdomains', 'subdomain')]:
+            rel_iterator = self.client.iterator(
+                f'/domains/{domain_report.id}/{relationship_name}',
+                limit=self.limit)
+            for item in rel_iterator:
+                attr = pymisp.MISPAttribute()
+                attr.from_dict(**dict(type='domain', value=item.id))
+                self.misp_event.add_attribute(**attr)
+                domain_object.add_reference(attr.uuid, misp_name)
+
+        # RESOLUTIONS
+        resolutions_iterator = self.client.iterator(
+            f'/domains/{domain_report.id}/resolutions', limit=self.limit)
+        for resolution in resolutions_iterator:
+            domain_object.add_attribute('ip', type='ip-dst',
+                                        value=resolution.ip_address)
+
+        # COMMUNICATING, DOWNLOADED AND REFERRER FILES
+        for relationship_name, misp_name in [
+            ('communicating_files', 'communicates-with'),
+            ('downloaded_files', 'downloaded-from'),
+            ('referrer_files', 'referring')
+        ]:
+            files_iterator = self.client.iterator(
+                f'/domains/{domain_report.id}/{relationship_name}',
+                limit=self.limit)
+            for file in files_iterator:
+                file_object = self.create_misp_object(file)
+                file_object.add_reference(domain_object.uuid, misp_name)
+                self.misp_event.add_object(**file_object)
+
+        # URLS
+        urls_iterator = self.client.iterator(
+            f'/domains/{domain_report.id}/urls', limit=self.limit)
+        for url in urls_iterator:
+            url_object = self.create_misp_object(url)
+            url_object.add_reference(domain_object.uuid, 'hosted-in')
+            self.misp_event.add_object(**url_object)
 
-        report_uuid = self.create_gti_report_object(domain_report)
-        domain_object.add_reference(report_uuid, 'analyzed-with')
         self.misp_event.add_object(**domain_object)
         return domain_object.uuid
 
     def parse_hash(self, file_hash: str) -> str:
-        """Create hash MISP object."""
         file_report = self.client.get_object(f'/files/{file_hash}')
-        file_object = pymisp.MISPObject('file')
-        for hash_type in ('md5', 'sha1', 'sha256'):
-            file_object.add_attribute(
-                hash_type,
-                **{'type': hash_type, 'value': file_report.get(hash_type)})
-
-        report_uuid = self.create_gti_report_object(file_report)
-        file_object.add_reference(report_uuid, 'analyzed-with')
+        file_object = self.create_misp_object(file_report)
+
+        # ITW URLS
+        urls_iterator = self.client.iterator(
+            f'/files/{file_report.id}/itw_urls', limit=self.limit)
+        for url in urls_iterator:
+            url_object = self.create_misp_object(url)
+            url_object.add_reference(file_object.uuid, 'downloaded')
+            self.misp_event.add_object(**url_object)
+
+        # COMMUNICATING, DOWNLOADED AND REFERRER FILES
+        for relationship_name, misp_name in [
+            ('contacted_urls', 'communicates-with'),
+            ('contacted_domains', 'communicates-with'),
+            ('contacted_ips', 'communicates-with')
+        ]:
+            related_files_iterator = self.client.iterator(
+                f'/files/{file_report.id}/{relationship_name}', limit=self.limit)
+            for related_file in related_files_iterator:
+                related_file_object = self.create_misp_object(related_file)
+                related_file_object.add_reference(file_object.uuid, misp_name)
+                self.misp_event.add_object(**related_file_object)
+
         self.misp_event.add_object(**file_object)
         return file_object.uuid
 
+    def parse_ip_port(self, ipport: str) -> str:
+        ip = ipport.split('|')[0]
+        self.parse_ip(ip)
+
     def parse_ip(self, ip: str) -> str:
-        """Create ip MISP object."""
         ip_report = self.client.get_object(f'/ip_addresses/{ip}')
 
         # IP
-        ip_object = pymisp.MISPObject('domain-ip')
-        ip_object.add_attribute('ip', type='ip-dst', value=ip_report.id)
+        ip_object = self.create_misp_object(ip_report)
+
+        # ASN
+        asn_object = pymisp.MISPObject('asn')
+        asn_object.add_attribute('asn', type='AS', value=ip_report.asn)
+        asn_object.add_attribute('subnet-announced', type='ip-src',
+                                 value=ip_report.network)
+        asn_object.add_attribute('country', type='text',
+                                 value=ip_report.country)
+        self.misp_event.add_object(**asn_object)
+
+        # RESOLUTIONS
+        resolutions_iterator = self.client.iterator(
+            f'/ip_addresses/{ip_report.id}/resolutions', limit=self.limit)
+        for resolution in resolutions_iterator:
+            ip_object.add_attribute('domain', type='domain',
+                                    value=resolution.host_name)
+
+        # URLS
+        urls_iterator = self.client.iterator(
+            f'/ip_addresses/{ip_report.id}/urls', limit=self.limit)
+        for url in urls_iterator:
+            url_object = self.create_misp_object(url)
+            url_object.add_reference(ip_object.uuid, 'hosted-in')
+            self.misp_event.add_object(**url_object)
 
-        report_uuid = self.create_gti_report_object(ip_report)
-        ip_object.add_reference(report_uuid, 'analyzed-with')
         self.misp_event.add_object(**ip_object)
         return ip_object.uuid
 
     def parse_url(self, url: str) -> str:
-        """Create URL MISP object."""
         url_id = vt.url_id(url)
         url_report = self.client.get_object(f'/urls/{url_id}')
+        url_object = self.create_misp_object(url_report)
+
+        # COMMUNICATING, DOWNLOADED AND REFERRER FILES
+        for relationship_name, misp_name in [
+            ('communicating_files', 'communicates-with'),
+            ('downloaded_files', 'downloaded-from'),
+            ('referrer_files', 'referring')
+        ]:
+            files_iterator = self.client.iterator(
+                f'/urls/{url_report.id}/{relationship_name}', limit=self.limit)
+            for file in files_iterator:
+                file_object = self.create_misp_object(file)
+                file_object.add_reference(url_object.uuid, misp_name)
+                self.misp_event.add_object(**file_object)
 
-        url_object = pymisp.MISPObject('url')
-        url_object.add_attribute('url', type='url', value=url_report.url)
-
-        report_uuid = self.create_gti_report_object(url_report)
-        url_object.add_reference(report_uuid, 'analyzed-with')
         self.misp_event.add_object(**url_object)
         return url_object.uuid