Incident Response Plan Irp Template

Standard Operating Procedure: Incident Response Plan (IRP) Template

Document ID: SOP-SEC-042
Effective Date: October 24, 2023
Version: 3.1.0
Review Cadence: Semi-Annual
Author: Julian Vance, Chief Architect

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1. Executive Summary & Purpose

This Standard Operating Procedure (SOP) establishes the institutional-grade Incident Response Plan (IRP) template for Template Registry infrastructure. The objective is to ensure rapid, methodical, and legally defensible containment, eradication, and recovery from security incidents. This document minimizes system downtime, preserves forensic integrity, and standardizes cross-functional communication during operational disruptions.

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2. Scope & Prerequisites

Scope

This procedure applies to all cloud infrastructure, on-premise hardware, containerized registries, application runtimes, and corporate endpoints managed by Template Registry.

Prerequisites & Required Access

• Administrative access to SIEM (Security Information and Event Management) platform.
• Multi-Factor Authentication (MFA) token and hardware-backed SSH keys.
• Write access to the immutable incident ticketing vault.
• Read/Write access to isolation and snapshot toolsets (AWS/GCP/Kubernetes primitives).
• Out-of-band communication channel (Signal Enterprise / PagerDuty / Secure Bridge).

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3. Roles & Responsibilities (RACI Matrix)

• Responsible: Executes the specific phase tasks.
• Accountable: Owns the outcome and final sign-off.
• Consulted: Provides subject matter expertise.
• Informed: Receives status updates.

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4. Step-by-Step Procedure

Phase 1: Preparation & Detection

• Verify automated SIEM/IDS alerts are forwarding telemetry to the primary logging cluster.
• Ensure all log collection agents (e.g., Fluentd, Auditd) maintain a minimum of 99.9% uptime.
• Confirm emergency out-of-band paging paths (PagerDuty) are tested and operational.
• Designate the on-call Incident Commander (IC) via the rotation roster.

Phase 2: Identification & Triage

• Acknowledge incoming security alert within 5 minutes of paging.
• Open an immutable incident ticket in the secure tracking system using the template INC-[YYYYMMDD]-[ID].
• Classify the incident severity level based on the following impact matrix:
  • SEV-1 (Critical): Data exfiltration, active ransomware, full system compromise.
  • SEV-2 (High): Privileged credential exposure, localized denial of service.
  • SEV-3 (Medium): Non-privileged anomalous access, policy violation.
  • SEV-4 (Low): Reconnaissance scanning, minor misconfiguration.
• Convene the initial triage bridge with SecOps and the designated IC.

Phase 3: Containment (Short-Term & Long-Term)

• Execute short-term containment protocols to halt lateral movement (e.g., isolate compromised EC2/Kubernetes pods via Security Group modifications).
• Revoke active sessions and invalidate API tokens for affected service accounts.
• Preserve volatile memory (RAM) and generate forensic disk snapshots of compromised nodes prior to powering down or terminating instances.
• Implement long-term containment patches (e.g., zero-day firewall rules, firmware updates) verified by the Architecture team.

Phase 4: Eradication

• Identify root cause vector (e.g., CVE, compromised credential, supply chain injection).
• Purge malicious binaries, reverse shells, web shells, and unauthorized persistence mechanisms (cron jobs, systemd services).
• Rebuild compromised infrastructure from known-good, cryptographically signed immutable templates.
• Scan clean assets using baseline static analysis and vulnerability scanners.

Phase 5: Recovery

• Restore services systematically, prioritizing core template registries and authentication engines.
• Monitor network telemetry, CPU utilization, and I/O metrics for 24 continuous hours post-restoration.
• Verify data integrity against cryptographic hashes captured prior to the incident window.
• Formally declare the incident closed to internal stakeholders once system health metrics normalize.

Phase 6: Post-Incident Review (Lessons Learned)

• Schedule the Post-Incident Review (PIR) meeting within 5 business days of incident closure.
• Draft the exhaustive Post-Mortem document detailing timeline of events, root cause analysis (RCA), and remediation effectiveness.
• Assign tracking tickets for preventive engineering tasks to eliminate recurring vulnerability vectors.
• Archive all forensic evidence, ticket transcripts, and audit logs to cold storage for compliance retention.

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5. Quality Assurance & Pro-Tips

Best Practices

• Preserve Chain of Custody: Treat all collected artifacts as potential legal evidence. Hash all snapshots immediately upon capture.
• Maintain Communication Rhythm: Issue updates to stakeholders every 30 minutes for SEV-1 incidents, and every 2 hours for SEV-2.

Common Pitfalls to Avoid

• Do not shut down compromised hosts immediately: Doing so destroys volatile memory (RAM) required for thorough forensic analysis. Take a snapshot first.
• Avoid unverified communication channels: Never discuss incident details over unsecured public chat or personal email.

Metric Thresholds

• Mean Time to Detect (MTTD): < 15 minutes.
• Mean Time to Respond (MTTR): < 30 minutes (SEV-1).
• Containment SLA: < 60 minutes from identification.

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6. Frequently Asked Questions (FAQ)

Q: What should I do if executive leadership demands real-time updates during a live SEV-1 incident?
A: Direct all external or executive inquiries exclusively through the Incident Commander or designated Communications Lead. The technical team must remain focused on containment and eradication without interruption.

Q: How long must forensic snapshots and incident logs be retained?
A: In accordance with institutional compliance mandates and regulatory frameworks, all incident artifacts, memory dumps, and SIEM logs must be retained in immutable storage for a minimum of seven (7) years.