In addition to data breaches, organizations are facing regulatory actions for having ineffective or non-existent response plans. Frameworks such as GDPR, HIPAA, CMMC, and PCI DSS now require documentation of incident response processes and procedures, with hefty fines. But let’s be clear about something—compliance is the floor, not the ceiling. No security professional or Chief Information Security Officer (CISO) creates an incident response plan just because they want to comply with regulatory mandates. The true benefit of a phishing incident response playbook is rapid containment. 

To achieve this containment, your team needs a clearly documented plan. The incident response plan is the playbook your incident response team follows, detailing roles, responsibilities, and decision rights across IT, security, and leadership. A well-practiced phishing attack incident response process minimizes damage, speeds up containment, and prevents attackers from gaining persistence in your environment.

Incident response is a well-known and standardized process, but phishing attacks need a few unique considerations:

Clear reporting chains

Employees need to know how to report a suspected phishing attack. This may be a dedicated email address, a button within your email client, or your security awareness platform. Whatever it is, make the process easy and test it regularly, or employees won’t use it.

The rise in phishing sophistication, including the use of QR codes, image-based content, and impersonation of trusted brands, means that greater vigilance and security awareness training are crucial.

—Huntress Cyber Threat Report, 2025

Immediate isolation procedures

Your plan should describe how to isolate infected systems and accounts. This may involve disabling credentials, blocking domains or IPs, and quarantining endpoints. Your plan should clearly define who has the authority to make these decisions and act on them without waiting for escalation.

Communication and escalation steps

Outline when and how to escalate incidents. Handle a single reported phishing email very differently from a campaign that compromises several accounts. Your plan should clearly define the triggers for escalation and who is to be notified. It should also include communication templates with key stakeholders, legal counsel, and potentially affected parties.

Evidence collection protocols

Preserve logs, email headers, and forensic artifacts from the earliest stages of the incident. Investigators use them for analysis and legal or regulatory compliance.

Learning how to create an incident response plan ensures your organization can act the moment a phishing attack or data breach occurs. A solid phishing incident response plan follows the same general format as other types of incident response frameworks, like NIST’s incident response lifecycle.

1. Preparation

This stage is about setting the groundwork for your incident response plan. Build out your incident response team and define roles and responsibilities. Deploy tools such as endpoint detection and response (EDR) solutions and set log collection and retention policies. Integrate your email security platform with your security information and event management (SIEM) so you have a central view of incidents.

2. Identification

Decide how you’ll identify phishing attempts. Will you use user reports, scan your emails for malicious content, or use behavioral analytics to detect anomalies? How will you triage reports, and how will you analyze suspicious emails and determine the scope of the compromise? Help analysts quickly determine incident severity by writing decision trees.

3. Containment

Use both short- and long-term containment strategies. Short-term containment might be as simple as disabling an account to prevent the attacker from further accessing systems. Long-term containment involves collecting artifacts and identifying all systems that the attacker compromised so that you can be sure that the attacker cannot access your systems by other means.

4. Eradication

Remove the threat completely. Eradication involves deleting malicious emails from all mailboxes, removing malware from compromised systems, and closing any vulnerabilities the attackers may have exploited. If you skip eradication and move straight to recovery, attackers can re-establish persistence and continue their campaign.

5. Recovery

In the recovery stage, you’ll restore normal operations. Reset any credentials, restore systems from backups if necessary, and monitor closely for any signs of persistence or re-infection. Make sure your plan details how you will validate that the threat is no longer present before you declare systems clean.

6. Learning

Within a few days of recovering from an incident, have a lessons learned meeting to discuss what went well and what needs improvement. Ask what steps your team can take to prevent similar attacks. Document these findings and use them to update your incident response plan.

7. Re-testing

After implementing improvements from your lessons learned meeting, test those changes to confirm they actually work. Re-run simulations or tabletop exercises that mimic the original attack scenario to validate your updated procedures and close any gaps you identified.

A plan that’s just sitting on a shelf collecting dust won’t be much help to you in the middle of an actual incident. Test your plan regularly, but don’t use production environments for fake scenarios.

Tabletop exercises

Bring your incident response team together quarterly and do tabletop walkthroughs with realistic phishing scenarios. Give them a situation and have them walk through their response. Tabletop exercises will identify holes in your plan and give muscle memory to your team.

Phishing simulations

Do controlled phishing campaigns that will kick off your actual response procedures. If an employee reports simulated phishing, does your documented process actually work? Measure metrics like time-to-report and time-to-containment.

Review and update your plan annually, after major environment changes like new tools and reorgs, or following an actual incident.

Train employees to recognize and report phishing attempts. They don’t need to know the specifics of your incident response plan. They just need to know how to recognize phishing and who to report to immediately.

Give your incident response team members regular training on the tools and procedures you’ll use. The GCIH (GIAC Certified Incident Handler) certification can be useful for your core incident response team members.

Make sure technical staff understand their specific responsibilities. System administrators, for example, should know how to isolate systems. Train help desk staff to triage reports and route them to the correct team.

Phishing attacks will only get more sophisticated. A strong incident response plan can shift your organization from an attractive target to a hardened defense that can detect, contain, and recover from attacks with speed and precision.