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104 lines
5.0 KiB
Markdown
104 lines
5.0 KiB
Markdown
# OpenCTI IOC Enrichment Workflows
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## Workflow 1: Automatic Enrichment Pipeline
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```
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[New Observable Created] --> [RabbitMQ Queue] --> [Enrichment Connectors]
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+-----------+-----------+
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v v v
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[VirusTotal] [Shodan] [AbuseIPDB]
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v v v
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[STIX Bundle] [STIX Bundle] [STIX Bundle]
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+-----------+-----------+
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v
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[Merged into OpenCTI]
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v
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[Confidence Updated]
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```
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### Steps:
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1. **Observable Ingestion**: New IP/domain/hash created via feed import or manual entry
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2. **Queue Distribution**: OpenCTI sends observable to enrichment connector queues
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3. **Parallel Enrichment**: Each connector queries its respective external API
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4. **STIX Bundle Generation**: Connectors produce STIX 2.1 bundles with notes, labels, relationships
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5. **Merge**: Enrichment results merged into the observable's knowledge graph
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6. **Scoring**: Confidence score updated based on aggregated enrichment data
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## Workflow 2: Analyst-Triggered Enrichment
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```
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[Analyst Selects Observable] --> [Manual Enrichment Request] --> [Selected Connectors]
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v v
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[Review Results] <-- [Enrichment Dashboard] <-- [Results Returned]
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v
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[Update Tags/Labels] --> [Add to Investigation]
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```
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### Steps:
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1. **Selection**: Analyst identifies observable requiring additional context
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2. **Connector Choice**: Select specific enrichment connectors to run
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3. **Execution**: Connectors query external services with observable value
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4. **Review**: Analyst reviews enrichment results in observable detail view
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5. **Curation**: Analyst updates labels, confidence, and adds notes
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6. **Investigation**: Link enriched observable to ongoing investigation case
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## Workflow 3: Bulk Enrichment Pipeline
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```
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[STIX Import] --> [Observable Extraction] --> [Batch Queue] --> [Rate-Limited Enrichment]
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[Progress Tracking]
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[Enrichment Report]
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```
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### Steps:
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1. **Bulk Import**: Import STIX bundle with hundreds of observables
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2. **Extraction**: OpenCTI extracts unique observables from imported data
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3. **Queue Management**: Observables queued for enrichment with rate limiting
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4. **Progressive Enrichment**: Connectors process queue respecting API rate limits
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5. **Monitoring**: Track enrichment progress via connector status dashboard
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6. **Reporting**: Generate enrichment summary with coverage statistics
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## Workflow 4: Enrichment-Driven Scoring
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```
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[Raw IOC (Score: 0)] --> [VirusTotal] --> [Score += VT_detections/total * 30]
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v
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[AbuseIPDB] --> [Score += abuse_confidence * 0.3]
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v
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[GreyNoise] --> [Score += classification_weight]
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v
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[Shodan] --> [Score += open_ports_risk]
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[Final Score (0-100)] --> [Priority Classification]
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+---------+---------+
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v v v
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[Critical] [High] [Low]
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(80-100) (50-79) (0-49)
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```
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### Steps:
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1. **Baseline**: Observable starts with confidence score of 0
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2. **VT Score**: VirusTotal detection ratio contributes up to 30 points
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3. **Abuse Score**: AbuseIPDB confidence contributes up to 30 points
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4. **Classification**: GreyNoise malicious/benign classification adds/subtracts points
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5. **Exposure**: Shodan data on open ports and known vulnerabilities adds risk points
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6. **Final Priority**: Aggregated score determines analyst priority queue placement
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