How to Deduplicate IOCs Before Importing Them into a SIEM

CyberKit field guide

Raw indicator lists almost always contain duplicates, mixed formats and casing differences. Importing them as-is pollutes the SIEM and slows correlation.

Cleaning workflow

1. Extract indicators from the source (logs, CSV, tickets).
2. Normalize casing and strip defanged artifacts.
3. Remove duplicates while preserving the first occurrence.
4. Separate by type (IP, domain, hash, URL).
5. Apply allowlists and warninglists before import.

Fast path

Paste the raw list into the IOC Deduplicator or use the IOC Extractor to pull indicators straight from log text.