Merge pull request #12876 from Security-Onion-Solutions/2.4/sigmafix

Sigma pivot fix and cleanup

Author: defensivedepth

salt/elastalert/files/modules/so/playbook-es.py

@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+
+# Copyright Security Onion Solutions LLC and/or licensed to Security Onion Solutions LLC under one
+# or more contributor license agreements. Licensed under the Elastic License 2.0 as shown at 
+# https://securityonion.net/license; you may not use this file except in compliance with the
+# Elastic License 2.0.
+
+
+from time import gmtime, strftime
+import requests,json
+from elastalert.alerts import Alerter
+
+import urllib3
+urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
+
+class SecurityOnionESAlerter(Alerter):
+    """
+    Use matched data to create alerts in Elasticsearch.
+    """
+
+    required_options = set(['detection_title', 'sigma_level'])
+    optional_fields = ['sigma_category', 'sigma_product', 'sigma_service']
+
+    def alert(self, matches):
+        for match in matches:
+            timestamp = strftime("%Y-%m-%d"'T'"%H:%M:%S"'.000Z', gmtime())
+            headers = {"Content-Type": "application/json"}
+
+            creds = None
+            if 'es_username' in self.rule and 'es_password' in self.rule:
+                creds = (self.rule['es_username'], self.rule['es_password'])
+
+            # Start building the rule dict
+            rule_info = {
+                "name": self.rule['detection_title'],
+                "uuid": self.rule['detection_public_id']
+            }
+
+            # Add optional fields if they are present in the rule
+            for field in self.optional_fields:
+                rule_key = field.split('_')[-1]  # Assumes field format "sigma_<key>"
+                if field in self.rule:
+                    rule_info[rule_key] = self.rule[field]
+
+            # Construct the payload with the conditional rule_info
+            payload = {
+                "tags": "alert",
+                "rule": rule_info,
+                "event": {
+                    "severity": self.rule['event.severity'],
+                    "module": self.rule['event.module'],
+                    "dataset": self.rule['event.dataset'],
+                    "severity_label": self.rule['sigma_level']
+                },
+                "sigma_level": self.rule['sigma_level'],
+                "event_data": match,
+                "@timestamp": timestamp
+            }
+            url = f"https://{self.rule['es_host']}:{self.rule['es_port']}/logs-playbook.alerts-so/_doc/"
+            requests.post(url, data=json.dumps(payload), headers=headers, verify=False, auth=creds)
+
+    def get_info(self):
+        return {'type': 'SecurityOnionESAlerter'}

salt/elastalert/files/modules/so/securityonion-es.py

@@ -1961,6 +1961,7 @@ soc:
               - rule.name
               - event.severity_label
               - event_data.event.dataset
+              - rule.category
               - event_data.source.ip
               - event_data.source.port
               - event_data.destination.host