Anthropic-Cybersecurity-Skills/skills/building-threat-intelligence-enrichment-in-splunk/references/workflows.md

Workflows - Threat Intelligence Enrichment in Splunk

TI Feed Integration Workflow

1. Identify Relevant TI Sources
   - Commercial feeds (Recorded Future, Mandiant)
   - Open source (OTX, AbuseIPDB, VirusTotal)
   - Industry ISACs
   - Internal threat lists
   |
   v
2. Configure Modular Inputs
   - Set polling intervals
   - Configure authentication
   - Map feed fields to Splunk schema
   |
   v
3. Normalize to KV Store
   - Parse raw feed data
   - Map to standard field names
   - Set confidence scores
   - Add source attribution
   |
   v
4. Create Lookup Definitions
   - Define transforms.conf entries
   - Set field mappings
   - Enable automatic lookups where appropriate
   |
   v
5. Build Correlation Searches
   - Match events against IOC lookups
   - Add asset/identity enrichment
   - Set severity based on confidence
   |
   v
6. Monitor and Maintain
   - Track feed freshness
   - Remove stale indicators
   - Measure hit rates per source

IOC Lifecycle Management

Ingestion --> Validation --> Active Use --> Aging --> Expiration --> Removal
    |              |            |            |           |
    v              v            v            v           v
  Raw feeds    Dedup and    Correlation   Reduce      Archive
  parsed       confidence   matching     confidence   or delete
               scoring                   weighting

Feed Quality Assessment

Metric	Good	Warning	Critical
Feed latency	< 1 hour	1-24 hours	> 24 hours
False positive rate	< 5%	5-15%	> 15%
Hit rate	> 1%	0.1-1%	< 0.1%
Coverage overlap	< 30%	30-60%	> 60%
Indicator freshness	< 7 days	7-30 days	> 30 days