ECC‑2:2024 Control 2‑13‑4 requires organizations to perform periodic incident and threat reviews and retain audit-ready evidence that those reviews occurred, the findings were acted on, and residual risk was acknowledged—this post explains exactly what artifacts auditors expect, how to collect them, and practical, small‑business-friendly ways to produce verifiable evidence for a Compliance Framework assessment.
Implementation overview: scope, cadence, roles
Start by defining scope (systems, business units, and threat sources) and cadence (monthly for high-risk assets, quarterly for general IT, annually for executive-level risk sign-off). Assign three roles for each review cycle: Review Owner (prepares materials), Reviewers (SOC/IT/Business reps), and Approver (CISO or designated approver). For Compliance Framework evidence, each review must include a documented agenda, the dataset reviewed, attendees, discussion minutes, action items with owners and due dates, and an approval record (signed or attested).
Evidence types and concrete technical details
Auditors want reproducible evidence. Produce and preserve: 1) SIEM/Log queries and raw exports (CSV/NDJSON) with timestamps, 2) incident summaries (ID, timeline, severity, root cause analysis), 3) threat intelligence snapshots (feeds or TXT/JSON snapshots), 4) meeting minutes and slide decks, and 5) change-control or remediation tickets. For SIEM exports include the query string and a screenshot or saved search ID plus the export file. Example Splunk query to show failed logins: index=main sourcetype=wineventlog EventCode=4625 | stats count by Account_Name, src_ip, host | sort -count. For Elastic: GET /_search?q=event.action:("authentication_failure")&size=1000. Save these exports with a cryptographic hash (sha256) and timestamp—e.g., sha256sum incidents-2026Q1.csv > incidents-2026Q1.csv.sha256—to prove immutability of the artifact presented to auditors.
Ticketing, RCA artifacts and storage details
Map every incident to a ticketing ID (JIRA/Trello/ServiceNow). Tickets should contain the timeline, evidence attachments, remediation steps, and a status field that shows closure or risk acceptance. Store immutable evidence in write-once storage: S3 with Object Lock (compliant mode) or an on-prem WORM archive. Keep an index file (CSV or JSON) that lists artifacts, their storage path, sha256, creation timestamp, reviewer, and control mapping (e.g., "Control 2‑13‑4 — Review 2026‑Q1 — Artifact: SIEM export — Path: s3://.../incidents-2026Q1.csv"). Ensure system clocks are synchronized (NTP) to avoid timestamp disputes.
Small-business cloud scenario (practical example)
Example: a 50-employee SaaS company using AWS with no in-house SOC. Use AWS CloudTrail + GuardDuty + an MDR provider. Quarterly reviews: export CloudTrail events covering the period, collect GuardDuty findings, attach MDR alerts and analyst notes, and create a consolidated incident summary spreadsheet. Produce meeting minutes in Google Docs with attendee emails and a signed approver attestation (PDF with SSO login timestamp). Push artifacts to an S3 bucket with Object Lock enabled and create a simple index file. This sequence provides auditors with: exports, MDR analyst notes, minutes, signed approval, and immutable storage metadata.
Small-business on-prem scenario (practical example)
Example: a small retail business with on-prem Windows servers and an EDR agent. Weekly EDR alerts are exported as CSV, Windows Security event logs are exported using wevtutil, and combined into a quarterly review packet. Track remediation in a shared JIRA board where each issue is a ticket with attachments. For evidence, save the exported log files, the JIRA report (CSV), the review minutes, and checksum files. If budget is limited, compress artifacts, store them in a versioned Git repository with protected branches and signed commits, and mirror to cloud storage for redundancy—retain commit hashes as proof of integrity.
Audit preparation, mapping, and retention
Create an Evidence Mapping Table that maps every artifact to the specific requirement language of Control 2‑13‑4 (e.g., "2‑13‑4.a — Quarterly incident review minutes — Path: ..."). Include evidence IDs so an auditor can request a specific item by reference. Define retention policy aligned with your Compliance Framework obligations (common recommendation: retain 12–36 months; high-risk environments may require longer). Also keep a "chain of custody" record for any artifacts that were modified after the review (who modified, justification, hash before and after). Provide auditors a simple playbook: how to reproduce the SIEM query, steps to open a ticket, and where signed attestations are stored.
Risks of not implementing the requirement
Failing to perform or document periodic incident and threat reviews increases the risk of undetected patterns, repeated incidents, ineffective remediation, and regulatory penalties. From an audit perspective, lack of evidence often leads to control findings, escalations, and potentially higher remediation costs. Operationally, missed trends (e.g., recurring phishing success) can result in a breach with business disruption, customer data loss, and reputational damage. Insurance claims may be reduced or denied if you cannot show evidence of proactive review and remediation.
Best practices and compliance tips
Keep reviews consistent and automatable: schedule exports via scripts or CI jobs, use saved searches, and automate hash generation. Maintain templates for incident summaries and meeting minutes to reduce reviewer variability. Use role-based access control so only approved staff can alter the evidence index. Regularly test your ability to retrieve and reproduce exported artifacts (tabletop readiness checks). Finally, keep metrics in the packet: mean time to detect (MTTD), mean time to remediate (MTTR), and number of open/closed action items—auditors appreciate measurable improvement over time.
Summary: To satisfy ECC‑2:2024 Control 2‑13‑4, build a repeatable process that defines scope and cadence, assigns owners, collects verifiable artifacts (SIEM exports, incident tickets, threat feed snapshots, minutes), secures them in immutable storage, and maps everything to the control. Small businesses can meet these requirements with pragmatic tooling (MDR, cloud exports, signed attestations, simple scripts and hashes) and by keeping a clear Evidence Mapping Table and retention policy—doing so reduces audit friction, lowers risk, and demonstrates measurable security governance.
