Cybersecurity Incident Response Plan Template PDF

Standard Operating Procedure: Cybersecurity Incident Response Plan (CIRP) Execution & Template Deployment

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1. Executive Summary & Purpose

This Standard Operating Procedure (SOP) defines the mandatory protocol for the activation, execution, and post-incident review of the Template Registry Cybersecurity Incident Response Plan (CIRP). The objective is to standardize containment, eradication, and recovery workflows across all operational environments to minimize organizational risk, ensure regulatory compliance, and preserve forensic chain of custody during security events.

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2. Scope & Prerequisites

2.1 Scope

This SOP applies to all information systems, cloud infrastructure, containerized workloads, on-premise hardware, and personnel operating under Template Registry.

2.2 Prerequisites & Tooling

Execution of this procedure requires verified access and operational familiarity with the following systems:

• SIEM/EDR Platform: CrowdStrike Falcon / Datadog Security Monitoring.
• Incident Management: PagerDuty (Enterprise Tier) & Jira Service Management.
• Forensic Toolkit: SIFT Workstation, Volatility Framework, Wireshark, and dd/FTK Imager.
• Communication Matrix: Out-of-band Signal Enterprise / Session-based channels (Primary) and encrypted Slack channels (Secondary).

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3. Roles & Responsibilities (RACI Matrix)

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4. Step-by-Step Procedure

Phase 1: Identification & Triage

• 1.1 Acknowledge incoming high-severity alerts via PagerDuty within 5 minutes of paging.
• 1.2 Open a high-priority incident bridge and secure war room channel (#sec-incident-[YYYYMMDD]).
• 1.3 Assign the Incident Commander (IC) role to coordinate triage and resource allocation.
• 1.4 Execute initial scoping: Determine vectors, affected assets, and data classification levels involved.

Phase 2: Containment (Short-Term & Long-Term)

• 2.1 Isolate compromised endpoints from the network using EDR automated quarantine protocols (crowdstrike containment --isolate).
• 2.2 Revoke active session tokens, OAuth grants, and IAM credentials associated with compromised service accounts.
• 2.3 Implement emergency network boundary blocks (WAF rule updates, Security Group modifications) at ingress points.
• 2.4 Verify containment efficacy by running internal network scans and validating egress traffic restrictions.

Phase 3: Eradication & Forensic Preservation

• 3.1 Capture volatile memory (RAM) and generate bit-stream disk images of affected hypervisors or bare-metal instances prior to remediation.
• 3.2 Document the cryptographic hashes (SHA-256) of all preserved forensic artifacts for chain-of-custody tracking.
• 3.3 Remove unauthorized persistence mechanisms (cron jobs, unauthorized SSH keys, web shells, modified binaries).
• 3.4 Patch underlying vulnerabilities or configuration drifts that enabled initial access.

Phase 4: Recovery & Validation

• 4.1 Restore systems from known-good, immutable backups verified free of malware and tampering.
• 4.2 Gradually phase assets back into production under heightened continuous monitoring.
• 4.3 Conduct integrity verification checks and execute unit/integration test suites on restored services.
• 4.4 Formally declare system stability and close the containment window in coordination with the CISO.

Phase 5: Post-Incident Activity (Lessons Learned)

• 5.1 Schedule and conduct a mandatory Blameless Post-Mortem within 72 hours of incident closure.
• 5.2 Compile all forensic logs, timelines, and impact metrics into the final Incident Report repository.
• 5.3 Create actionable engineering tickets to address root cause deficiencies and update CIRP templates accordingly.

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5. Quality Assurance & Pro-Tips

5.1 Pro-Tips for System Engineers

• Preserve State: Never power down a live compromised host unless strictly necessary for safety; volatile RAM holds critical IOCs (Indicators of Compromise) that vanish on reboot.
• Out-of-Band Communications: Assume enterprise Slack/Teams may be monitored if an administrative account is compromised. Fall back to verified out-of-band communication channels immediately.
• Automate Containment: Script your EDR isolation playbooks ahead of time. Manual isolation during active lateral movement introduces dangerous latency.

5.2 Metric Thresholds

• Mean Time to Detect (MTTD): Target $< 15$ minutes.
• Mean Time to Respond/Contain (MTTR): Target $< 30$ minutes for critical assets.
• Post-Mortem Publication Window: $\le 72$ hours post-resolution.

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6. Frequently Asked Questions (FAQ)

Q1: What should be done if an attacker exhibits active lateral movement during containment?
A: Immediately sever the local subnet interconnect or invoke global network quarantine via the cloud provider’s API command-line interface. Escalate directly to the CISO to authorize complete enterprise network segmentation if network-wide persistence is suspected.

Q2: How do we handle legal holds when forensic imaging cloud infrastructure (e.g., AWS EC2)?
A: Utilize cloud-native snapshot preservation tools with immutable retention locks enabled. Ensure the snapshot lifecycle policies are suspended to prevent automated deletion, and log all volume metadata hashes in the secure incident ledger.