New analyzer: NERD

analyzers/NERD/nerd.json

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+{
+  "name": "NERD",
+  "version": "1.0",
+  "author": "Vaclav Bartos, CESNET",
+  "url": "https://github.com/TheHive-Project/Cortex-Analyzers",
+  "license": "AGPL-V3",
+  "description": "Get Reputation score and other basic information from Network Entity Reputation Database (NERD)",
+  "dataTypeList": ["ip"],
+  "baseConfig": "NERD",
+  "command": "NERD/nerd_analyzer.py",
+  "configurationItems": [
+    {
+      "name": "key",
+      "description": "API key",
+      "type": "string",
+      "multi": false,
+      "required": true
+    },
+    {
+      "name": "url",
+      "description": "Base URL of the NERD instance",
+      "type": "string",
+      "multi": false,
+      "required": false,
+      "defaultValue": "https://nerd.cesnet.cz/nerd/"
+    }
+  ],
+  "registration_required": true,
+  "subscription_required": false,
+  "service_homepage": "https://nerd.cesnet.cz/",
+  "service_logo": {
+    "path": "assets/NERD_logo.png",
+    "caption": "logo"
+  },
+  "screenshots": [
+    {
+      "path": "assets/NERD_long.png",
+      "caption": "NERD long report sample"
+    },
+    {
+      "path": "assets/NERD_short.png",
+      "caption:": "NERD mini report sample"
+    }
+  ]
+}

analyzers/NERD/nerd_analyzer.py

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+#!/usr/bin/env python3
+# encoding: utf-8
+
+import requests
+from cortexutils.analyzer import Analyzer
+
+# Map of tag IDs to (name,level)-tuple used in summary (tags not listed here are not shown)
+tag_map = {
+    'reconscanning': ('Scanner', 'suspicious'),
+    'attemptexploit': ('Exploit', 'malicious'),
+    'attemptlogin': ('Login', 'malicious'),
+    'malware': ('Malware', 'malicious'),
+    'availabilitydos': ('DDoS', 'malicious'),
+    'researchscanners': ('Research scanner', 'safe'),
+    'vpn': ('VPN', 'info'),
+    'nat': ('NAT', 'info'),
+    'dsl': ('DSL', 'info'),
+    'dynamicIP': ('Dynamic IP', 'info'),
+    'tor': ('Tor exit node', 'info'),
+    'spam': ('Spam', 'malicious'),
+    'reserved_ip': ('Reserved IP', 'info'),
+}
+
+
+class NERDAnalyzer(Analyzer):
+    def __init__(self):
+        Analyzer.__init__(self)
+        self.base_url = self.get_param('config.url', None, 'Config error: Missing URL of NERD.')
+        if not self.base_url.endswith('/'):
+            self.base_url += '/'
+        self.api_key = self.get_param('config.key', None, 'Config error: Missing API key for NERD.')
+
+    def summary(self, raw):
+        """Returns a summary, needed for 'short.html' template, based on the full report"""
+
+        taxonomies = []
+        if 'message' in raw:
+            # IP wasn't found
+            taxonomies.append(self.build_taxonomy('safe', 'NERD', 'Rep', 'no-data'))
+        else:
+            # Reputation score (set level/color according to the score)
+            rep = round(raw['rep'], 3)
+            rep_level = 'safe' if rep < 0.02 else ('suspicious' if rep <= 0.5 else 'malicious')
+            taxonomies.append(self.build_taxonomy(rep_level, 'NERD', 'Rep', rep))
+
+            # Number of blacklists
+            if raw['blacklists']:
+                taxonomies.append(self.build_taxonomy('malicious', 'NERD', 'Blacklists', len(raw['blacklists'])))
+
+            # Tags
+            for tag_name,level in raw['translated_tags']:
+                taxonomies.append(self.build_taxonomy(level, 'NERD', 'Tag', tag_name))
+
+        return {'taxonomies': taxonomies}
+
+    def artifacts(self, raw):
+        """Returns a list of indicators extracted from reply (only "hostname" in this case)"""
+        if raw.get('hostname'):
+            return [{'dataType': 'fqdn', 'data': raw['hostname']}]
+        return []
+
+    def run(self):
+        """Main function run by Cortex to analyze an observable."""
+        if self.data_type != 'ip':
+            self.error("Invalid data type, only IP addresses are supported")
+            return
+        ip = self.get_data()
+
+        # Get data from server
+        url = '{}api/v1/ip/{}'.format(self.base_url, ip)
+        headers = {'Authorization': self.api_key}
+        try:
+            resp = requests.get(url, headers=headers)
+        except Exception as e:
+            self.error("Error when trying to contact server: {}".format(e))
+            return
+
+        # Parse received data
+        try:
+            data = resp.json()
+        except ValueError:
+            self.error("Unexpected or invalid response received from server (can't parse as JSON). A possible reason can be wrong URL.")
+            return
+
+        if resp.status_code == 404:
+            # IP not found in NERD's DB (i.e. it wasn't reported as malicious)
+            self.report({
+                'rep': 0.0,
+                'message': '{} not found in NERD, i.e. there are no recent reports of malicious activity.'.format(ip),
+                'nerd_url': '{}ip/{}'.format(self.base_url, ip), # Link to IP's page at NERD web
+            })
+            return
+        elif resp.status_code == 200:
+            # Success, IP data received - format as output for Cortex
+            try:
+                # Translate tags
+                translated_tags = []
+                tag_ids = [t['n'] for t in data['tags'] if t.get('c', 1.0) >= 0.5] # List of tags with confidence >= 50%
+                for tag in tag_ids:
+                    try:
+                        tag_name, level = tag_map[tag]
+                    except KeyError:
+                        continue
+                    translated_tags.append([tag_name, level])
+                # Create report
+                self.report({
+                    'rep': data['rep'], # reputation score (number between 0.0 to 1.0)
+                    'hostname': data['hostname'], # result of DNS PTR qeury
+                    'asn': data['asn'], # list of ASNs announcing the IP (usually just one)
+                    'country': data['geo'].get('ctry', ''), # Geolocation - two-letter country code
+                    'blacklists': data['bl'], # List of blacklists the IP is listed on
+                    'tags': tag_ids, # Original Tags as in NERD
+                    'translated_tags': translated_tags, # Tags filtered and translated to nicer names
+                    'nerd_url': '{}ip/{}'.format(self.base_url, ip), # Link to IP's page at NERD web
+                })
+            except KeyError as e:
+                self.error("Invalid response received from server, missing field: {}".format(e))
+        else:
+            # Unexpected status code, there should be an 'error' field with error message
+            self.error("Error: {} {}".format(resp.status_code, data.get('error', '(no error message)')))
+            return
+
+
+if __name__ == '__main__':
+    NERDAnalyzer().run()

analyzers/NERD/requirements.txt

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+requests
+cortexutils

thehive-templates/NERD_1_0/long.html

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+<div class="panel panel-info" ng-if="success">
+    <div class="panel-heading">
+        NERD information for <strong>{{artifact.data}}</strong>
+    </div>
+    <div class="panel-body" ng-if="content.message">
+        <p>{{content.message}}</p>
+        <p>Current info at: <a href="{{content.nerd_url}}" target="_blank">{{content.nerd_url}}</a></p>
+    </div>
+    <div class="panel-body" ng-if="!content.message">
+        <dl class="dl-horizontal">
+            <dt class="text-bold">
+                Reputation score
+                <sup style="color: #999" title="A score computed from the number of recent alerts, their age, and the number of distinct sources (0.0 = no alerts, 1.0 = lots of alerts from multiple sources)">(?)</sup>
+            </dt>
+            <dd><span style="color: hsl({{ (100 - 100*content.rep | number: 2) }}, 85%, 50%); margin-right: 5px">&#x2B24;</span>{{content.rep | number: 3}}</dd>
+        </dl>
+        <dl class="dl-horizontal">
+            <dt class="text-bold">Hostname</dt>
+            <dd>{{content.hostname || "&mdash;"}}</dd>
+        </dl>
+        <dl class="dl-horizontal">
+            <dt class="text-bold">Blacklists</dt>
+            <dd>{{content.blacklists.join(", ") || "&mdash;"}}</dd>
+        </dl>
+        <dl class="dl-horizontal">
+            <dt class="text-bold">Tags</dt>
+            <dd>
+                <span ng-repeat="t in content.translated_tags" class="label" style="margin-right: 5px" ng-class="{'info': 'label-info', 'safe': 'label-success', 'suspicious': 'label-warning', 'malicious':'label-danger'}[t[1]]">{{t[0]}}</span>
+                <span ng-if="!content.translated_tags.length">&mdash;</span>
+            </dd>
+        </dl>
+        <dl class="dl-horizontal">
+            <dt class="text-bold">ASN</dt>
+            <dd>{{content.asn.join(", ") || "unknown"}}</dd>
+        </dl>
+        <dl class="dl-horizontal">
+            <dt class="text-bold">Country</dt>
+            <dd>{{content.country || "unknown"}}</dd>
+        </dl>
+        <p>Full info at: <a href="{{content.nerd_url}}" target="_blank">{{content.nerd_url}}</a></p>
+    </div>
+</div>
+
+<!-- General error -->
+<div class="panel panel-danger" ng-if="!success">
+    <div class="panel-heading">
+        <strong>{{artifact.data}}</strong>
+    </div>
+    <div class="panel-body">
+        {{content.errorMessage}}
+    </div>
+</div>

thehive-templates/NERD_1_0/short.html

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+<span class="label" ng-repeat="t in content.taxonomies" ng-class="{'info': 'label-info', 'safe': 'label-success', 'suspicious': 'label-warning', 'malicious':'label-danger'}[t.level]">
+    {{t.namespace}}:{{t.predicate}}="{{t.value}}"
+</span>