Email Phishing Attack: What to Do If Someone Clicked a Link

It happens in seconds. An employee receives an email that looks legitimate—perhaps from a trusted vendor or internal executive—clicks a link, and unwittingly triggers a phishing attack. Panic sets in. But how you respond in the next minutes and hours determines whether this becomes a minor incident or a major breach. For IT decision makers, business owners, and office managers, having a clear, actionable response plan is critical.

This guide outlines the exact steps to take after someone clicks a malicious link, from immediate containment to long-term recovery. Whether you have an in-house IT team or rely on external support, these actions will help minimize damage and restore security.

Immediate Steps: Contain the Threat (First 10 Minutes)

Time is your enemy. The moment you learn of a click, act without hesitation.

1. Disconnect the Affected Device from the Network

Physically or wirelessly disconnect the computer or device from the internet and your local network. This prevents the malware from communicating with command-and-control servers or spreading laterally. Unplug the Ethernet cable, disable Wi-Fi, and turn off Bluetooth.

2. Do Not Power Off the Device (Unless Directed)

While disconnecting is critical, avoid shutting down the computer immediately. Forensic data in memory (RAM) may be lost, and some malware activates on shutdown. Leave the device on but isolated.

3. Preserve Evidence

Take a screenshot of the suspicious email (including headers if possible) and note the time of the click. Do not forward the email to others—this could spread the threat. Instead, save a copy of the email as a .eml or .msg file for analysis.

4. Alert Your IT Team or Managed Service Provider

Notify your internal IT security team or external support immediately. If you don’t have dedicated IT staff, consider engaging a remote IT support platform like OnTechCare.com, where you can find vetted professionals who specialize in incident response.

Assess the Scope: Determine What Was Compromised

Once the immediate threat is contained, shift to assessment. This step requires technical expertise, but even non-technical leaders can guide the process.

1. Identify the Type of Phishing Attack

Was it a credential harvesting link (fake login page), a malware download (e.g., ransomware, keylogger), or a business email compromise (BEC) attempt? The email content and URL can offer clues. For example, a link to a fake Office 365 login page suggests credential theft, while a .exe attachment indicates malware.

2. Check for Credential Entry

Did the employee enter any passwords or sensitive information? If so, assume those credentials are compromised. Immediately force a password reset for that account and any other accounts using the same password. Enable multi-factor authentication (MFA) if not already active.

3. Scan for Malware and Unauthorized Access

Run a full antivirus/anti-malware scan on the affected device. Use endpoint detection and response (EDR) tools if available. Check for new processes, unusual network connections, or file changes. Also review logs for the affected user’s account—look for logins from unfamiliar locations or times.

4. Determine Lateral Movement Risk

If the device had access to shared drives, databases, or admin tools, the attacker may have moved to other systems. Check for unusual activity on file servers, email accounts, and cloud services. Engage a cybersecurity professional if you lack internal resources.

Remediate: Remove the Threat and Restore Systems

After assessing, take action to clean and secure your environment. This phase may take hours or days depending on the severity.

1. Remove Malware from Affected Devices

Use reputable removal tools or reimage the device (wipe and reinstall the operating system). Reimaging is often the safest option for confirmed infections. Ensure all data is backed up before wiping.

2. Reset All Compromised Credentials

Beyond the user’s account, reset any service accounts, application passwords, and API keys that may have been exposed. Require strong, unique passwords and enforce MFA everywhere.

3. Block the Phishing Email and Similar Threats

Add the sender’s domain, email address, and any malicious URLs to your email security filter. Update rules to flag similar patterns. Notify your email provider or security vendor.

4. Review and Tighten Security Controls

Use this incident as a catalyst for improvement. Ensure that:

• Spam filters are configured to block known phishing domains.
• DMARC, DKIM, and SPF records are properly set to prevent email spoofing.
• User permissions follow the principle of least privilege.
• Endpoint protection and EDR are up to date.
• Backups are current and stored offline or in immutable storage.

Communicate: Notify Stakeholders and Regulators

Transparency is key, but communication must be careful to avoid panic or legal liability.

1. Internal Communication

Inform affected employees and relevant teams (e.g., finance, legal) about the incident without sharing unnecessary details. Provide clear instructions on what they should do (e.g., change passwords, report suspicious activity).

2. External Communication (If Required)

If customer data or sensitive business information was compromised, you may be legally required to notify affected parties and regulators (e.g., under GDPR, CCPA, or HIPAA). Consult legal counsel before sending any notifications. Prepare a concise statement that explains what happened, what data was involved, and what steps you are taking.

3. Report the Attack

Report the phishing attempt to relevant authorities such as the FBI’s Internet Crime Complaint Center (IC3) or the Anti-Phishing Working Group (APWG). This helps track threat actors and may assist in recovery.

Future-Proof: Strengthen Your Defenses Against Phishing

Every phishing attack is a learning opportunity. Use this experience to build a more resilient organization.

1. Conduct Regular Security Awareness Training

Train employees to recognize phishing attempts—spoofed domains, urgent language, suspicious attachments. Run simulated phishing campaigns to test and reinforce learning. Make reporting phishing emails easy (e.g., a dedicated button in Outlook).

2. Implement Advanced Email Security

Deploy solutions that use AI and machine learning to detect sophisticated phishing emails, including those that bypass traditional filters. Consider DMARC enforcement to reject spoofed emails.

3. Enforce Multi-Factor Authentication (MFA)

MFA is one of the most effective defenses against credential theft. Require it for all accounts, especially administrative and financial roles.

4. Develop an Incident Response Plan

Document a step-by-step plan for phishing incidents. Include contact information for your IT team, legal counsel, and external support. Test the plan with drills.

5. Partner with Vetted IT Security Experts

Not every organization has the budget or expertise for a full-time security team. Platforms like OnTechCare.com connect you with pre-vetted remote IT support professionals who can help with incident response, security audits, and ongoing monitoring. When you need expert help fast, you can post a job on OnTechCare and get matched with qualified technicians.

Conclusion: Act Fast, Learn Faster

A single click on a phishing link doesn’t have to become a catastrophe. By following this structured response—contain, assess, remediate, communicate, and fortify—you can limit damage and emerge stronger. The key is preparation and speed. If your organization lacks the in-house expertise to handle such incidents, consider leveraging remote IT support. OnTechCare.com offers a platform to find vetted professionals who can assist with everything from immediate containment to long-term security improvements.

Don’t wait for the next attack. Review your current phishing response plan today. And if you need reliable IT support, post a job on OnTechCare to connect with experts who can help safeguard your business.

Call to Action: Need immediate help after a phishing attack? Post a job on OnTechCare.com to find vetted remote IT support professionals ready to assist with containment, forensics, and recovery.