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add: ability to state the field mappings per Sigma rules #26

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merged 1 commit into from
Nov 11, 2024
Merged

add: ability to state the field mappings per Sigma rules #26

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10 changes: 10 additions & 0 deletions src/droid/platforms/sentinel.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
from azure.mgmt.securityinsight.models import EventGroupingSettings
from azure.mgmt.securityinsight.models import IncidentConfiguration
from azure.mgmt.securityinsight.models import GroupingConfiguration
from azure.mgmt.securityinsight.models import EntityMapping, FieldMapping
from azure.monitor.query import LogsQueryClient, LogsQueryStatus
from datetime import datetime, timedelta, timezone
from azure.core.exceptions import HttpResponseError, ResourceNotFoundError
Expand Down Expand Up @@ -420,6 +421,14 @@ def create_rule(self, rule_content, rule_converted, rule_file):
else:
enabled = True

# Handling the entities
entity_mappings = []
if rule_content.get('custom', {}).get('entity_mappings'):
for mapping in rule_content['custom']['entity_mappings']:
field_mappings = [FieldMapping(identifier=field['identifier'], column_name=field['column_name'])
for field in mapping['field_mappings']]
entity_mappings.append(EntityMapping(entity_type=mapping['entity_type'], field_mappings=field_mappings))

# Handling the severity
if rule_content['level'] == 'critical':
severity = 'high'
Expand Down Expand Up @@ -471,6 +480,7 @@ def create_rule(self, rule_content, rule_converted, rule_file):
event_grouping_settings=EventGroupingSettings(aggregation_kind="SingleAlert"),
incident_configuration=IncidentConfiguration(create_incident=create_incident, grouping_configuration=grouping_config),
tactics=self.mitre_tactics(rule_content),
entity_mappings=entity_mappings,
techniques=self.mitre_techniques(rule_content)
)

Expand Down