analyzing-threat-intelligence-feeds

name	analyzing-threat-intelligence-feeds
description	Analyzes structured and unstructured threat intelligence feeds to extract actionable indicators, adversary tactics, and campaign context. Use when ingesting commercial or open-source CTI feeds, evaluating feed quality, normalizing data into STIX 2.1 format, or enriching existing IOCs with campaign attribution. Activates for requests involving ThreatConnect, Recorded Future, Mandiant Advantage, MISP, AlienVault OTX, or automated feed aggregation pipelines.
domain	cybersecurity
tags	["STIX","TAXII","MITRE-ATT&CK","IOC","ThreatConnect","Recorded-Future","MISP","CTI","NIST-CSF"]
subdomain	threat-intelligence
version	1.0.0
author	oyi77
license	Apache-2.0
nist_csf	["ID.RA-01","ID.RA-05","DE.CM-01","DE.AE-02"]

Analyzing Threat Intelligence Feeds

Overview

Cybersecurity skill for analyzing threat intelligence feeds. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "analyzing threat intelligence feeds"
• "Ingesting new commercial or OSINT threat feeds and assessing their signal-to-noi"
• "Normalizing heterogeneous IOC formats (STIX 2"
• "Evaluating feed freshness, fidelity, and relevance to the organization's threat"

Use this skill when:

• Ingesting new commercial or OSINT threat feeds and assessing their signal-to-noise ratio
• Normalizing heterogeneous IOC formats (STIX 2.1, OpenIOC, YARA, Sigma) into a unified schema
• Evaluating feed freshness, fidelity, and relevance to the organization's threat profile
• Building automated enrichment pipelines that correlate IOCs against SIEM events

Do not use this skill for raw packet capture analysis or live incident triage without first establishing a CTI baseline.

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Access to a Threat Intelligence Platform (TIP) such as ThreatConnect, MISP, or OpenCTI
• API keys for at least one commercial feed (Recorded Future, Mandiant Advantage, or VirusTotal Enterprise)
• TAXII 2.1 client library (taxii2-client Python package or equivalent)
• Role with read/write permissions to the TIP's indicator database

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text)  k, v  IOC_PATTERNS.items()}