conducting-post-incident-lessons-learned

name	conducting-post-incident-lessons-learned
description	Facilitate structured post-incident reviews to identify root causes, document what worked and failed, and produce actionable recommendations to improve future incident response. Use when working with conducting post incident lessons learned.
domain	cybersecurity
tags	["incident-response","lessons-learned","post-incident","after-action-review","process-improvement"]
subdomain	incident-response
mitre_attack	["T1190","T1566","T1078"]
version	1.0
author	oyi77
license	Apache-2.0
nist_csf	["RS.MA-01","RS.MA-02","RS.AN-03","RC.RP-01"]

Conducting Post Incident Lessons Learned

Overview

Cybersecurity skill for conducting post incident lessons learned. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "conducting post incident lessons learned"

• "Facilitate structured post-incident reviews to identify root causes, document wh"

• After any security incident has been fully resolved and recovery completed

• Following tabletop exercises or IR simulations

• After significant near-miss events

• Quarterly review of accumulated incident trends

• When IR playbooks need updating based on real-world experience

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

• Incident fully resolved (containment, eradication, recovery complete)
• Incident timeline and documentation gathered
• All incident responders available for review session
• Meeting space for collaborative discussion
• Incident ticketing system data for metrics analysis

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) for k, v in IOC_PATTERNS.items()}

1. Scope the Analysis — Define what post incident lessons learned artifacts or data sources to examine and the investigation timeline.