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The reliable way to protect a company from AI-assisted phishing is a layered operating plan: require independent verification of unusual requests, make reporting easy across every communication channel, deploy email and endpoint controls, use strong and preferably phishing-resistant MFA, limit access, and rehearse a rapid response. AI makes fraudulent messages more fluent and better tailored; it does not make any single control sufficient.
NIST warns that AI can produce “increasingly convincing phishing attacks,” making it more important to take a second or third look at requests to click a link, download a file, transfer funds, log in, or submit sensitive information. The guidance below turns that warning into a company-level program for owners, IT leaders, and security teams.
What AI-assisted phishing changes
Traditional advice often tells employees to look for poor grammar, spelling mistakes, or awkward wording. Those clues are now unreliable. Generative AI can produce polished messages, imitate a business tone, translate naturally, and personalize a request from publicly available information. A convincing message can still be fraudulent, so the decision must be based on the requested action and the verification path, not on writing quality.
Train people to pause whenever a message asks them to:
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- click a link or scan a QR code;
- download or enable a file, macro, browser extension, or remote-access tool;
- log in, approve an MFA prompt, or disclose a code;
- transfer money, change payment details, buy gift cards, or alter payroll;
- share customer, employee, health, personal, financial, or proprietary information; or
- keep the request secret or act under unusual time pressure.
Use a known telephone number, an existing vendor record, a bookmarked portal, or a company website to verify the request. Do not use a phone number, reply address, link, or attachment supplied by the suspicious message. This independent check is especially important when the apparent sender is an executive, supplier, bank, or other trusted partner. NIST’s current small-business guidance describes these warning signs and verification practices at NIST’s phishing guidance (updated August 19, 2025).
Phishing is not limited to email. A campaign may begin with a text message, voice call, social-network direct message, collaboration-platform chat, or physical letter and then move the victim to a login page or payment process. Your reporting process must cover all of those channels.
Start with an account and data inventory
You cannot protect accounts you do not know exist. Build an inventory of identity providers, email, finance and payment systems, customer databases, health or personal-data stores, cloud consoles, code repositories, remote-access tools, and third-party services. Record the owner, business purpose, sign-in method, recovery contact, privileged roles, and whether MFA is available.
Prioritize the accounts an attacker would value
- Administrator, domain, identity-provider, and security-management accounts.
- Accounts that can approve payments, edit supplier bank details, or access payroll.
- Mailboxes used by executives, finance, procurement, human resources, and help desks.
- Applications containing customer, health, employee, payment-card, or other sensitive data.
- Shared or service accounts that cannot be tied to one accountable person.
Apply MFA consistently, beginning with privileged users and sensitive applications. NIST recommends prioritizing phishing-resistant authenticators for sensitive applications and elevated-privilege users; its MFA guidance also covers access management and password managers (updated January 5, 2026).
Remove unnecessary access
Give each employee only the systems and data required for the current role. Review access when someone changes jobs and remove it promptly when they leave. Separate everyday work from administrator accounts, use approval for high-risk actions, and review dormant accounts. A password manager can help employees create unique, strong passwords, but it cannot make a malicious payment request or fake login page safe.
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Use phishing-resistant MFA for the highest-risk access
MFA reduces the damage from a stolen password, but not every second factor resists phishing. NIST Special Publication 800-63B defines phishing resistance as the ability of an authentication protocol to prevent an impostor verifier from obtaining authentication secrets or valid authenticator outputs “without relying on the vigilance of the claimant.” In practical terms, the authenticator must bind the sign-in to the legitimate site or service.
Manually entered one-time passwords are not phishing-resistant under this definition: a fake site can ask for the current code and relay it to the real site. WebAuthn/FIDO2 methods provide verifier-name binding, so an authenticator is designed to respond only to the legitimate origin. See the NIST SP 800-63B section on phishing resistance.
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| Method | Credential-relay resistance | Deployment form | What to verify before rollout |
|---|---|---|---|
| Password alone | None; a phished password can be reused directly. | Any browser or application that accepts passwords. | Replace with MFA wherever possible and eliminate shared credentials. |
| SMS or manually entered OTP | Not phishing-resistant; a code can be captured and relayed. | Phone number, authenticator app, or token that displays a code. | Use as a fallback only when stronger options are unavailable, and monitor for unusual recovery or lockout activity. |
| Push approval | Improves security over a password alone but can be abused through prompt fatigue or deceptive approval requests. | Managed mobile device or authenticator app. | Require number matching or equivalent safeguards where supported; train users never to approve an unexpected prompt. |
| FIDO2/WebAuthn hardware authenticator | Designed to resist credential relay through origin binding. | Standalone USB, NFC, or other compatible hardware key. | Check every provider’s support, enrollment, replacement, loss and revocation process, and recovery path. |
| FIDO2/WebAuthn platform authenticator | Designed to resist credential relay through origin binding. | Authenticator built into a compatible managed phone or computer. | Confirm device management, employee access requirements, backup and recovery, and support across critical applications. |
A physical security key is one implementation of FIDO2/WebAuthn, not a complete anti-phishing program. Compatible phones and laptops may already provide platform authenticators. Before choosing either form, test support in email, single sign-on, finance, administration, and other critical services. Document how staff enroll, replace a lost authenticator, revoke a device, and recover an account without silently downgrading everyone to a weaker factor. NIST discusses authenticator recovery and synchronization risks in SP 800-63B.
Harden email and endpoint layers
Technical controls should reduce the number of dangerous messages that reach an employee and limit what happens after a click. Configure the filtering, quarantine, attachment, URL-scanning, and impersonation protections offered by your mail provider. Enable available sender-origin authentication controls and monitor failures and spoofing attempts. These controls are complementary: a message that passes one check may still be malicious.
Keep endpoint protection enabled and current on workstations, servers, and managed mobile devices. Apply operating-system, browser, office-suite, VPN, and security-tool updates on a defined schedule. Block or restrict unnecessary macros, unsigned scripts, unapproved remote-access software, and executable attachments according to business requirements. Maintain centralized logging so investigators can correlate a suspicious message, a sign-in, an endpoint alert, and a financial transaction.
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Filtering and antivirus are not substitutes for employee reporting or MFA. Conversely, awareness training is not a substitute for filtering, origin authentication, maintained software, and endpoint protection. NIST’s phishing guidance calls for these layers together.
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Write a simple verification rule
Adopt a written rule such as: “Urgent requests involving money, credentials, downloads, account changes, or sensitive data require a second channel.” Specify acceptable channels, such as calling a number already stored in the vendor record, starting a new conversation in the company directory, or visiting a bookmarked service portal. Do not treat a reply to the suspicious message as independent verification.
Give employees a safe reporting path
Provide a one-step method to report a message without clicking its links or replying. Preserve the original message and relevant headers when possible. Tell employees what happens after they report: who reviews it, how quickly they can expect a response, and whether they should delete or retain it. Make the same path available for:
- email and calendar invitations;
- SMS and messaging applications;
- voice calls and voicemail;
- social-media and collaboration-platform messages; and
- letters, invoices, courier deliveries, or other physical requests.
Reward early reporting, including reports of a message that turned out to be legitimate. A fast report can protect colleagues even when the first recipient clicked.
Train for actions, not slogans
Show realistic examples of executive impersonation, supplier-payment changes, fake shared documents, password-reset notices, and MFA prompts. Practice opening the reporting tool, independently checking a request, and contacting the incident team. Include contractors and temporary staff who handle company data or payments.
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If you run simulated phishing, interpret results in context. NIST Technical Note 2276’s Phish Scale is intended to rate how difficult a simulated phishing email is for a person to detect, allowing training teams to relate click or report rates to message difficulty rather than treating every simulation as equivalent. See NIST TN 2276. Use simulations to improve controls and decision-making, not to shame individuals or create a false impression that a low click rate proves the company is safe.
Prepare a documented response before an incident
Assume that a convincing message will eventually reach someone. Publish an incident channel, an escalation list, and a short decision tree. Include security, IT, legal or privacy, finance, communications, and executive contacts, with alternates for nights and weekends. Test the contacts and permissions regularly.
What an employee should do after a suspected interaction
- Stop interacting. Close the page, end the call or chat, and do not approve additional prompts. Do not delete evidence unless instructed.
- Report immediately. Use the established internal channel and state what was clicked, downloaded, disclosed, approved, or entered, along with the approximate time and device.
- Change the affected password. Use a clean, trusted device if possible. Change the password anywhere it was reused and replace it with a unique strong password. Do not type a password into the suspicious page again.
- Contact the financial institution when relevant. If payment details, banking access, invoices, payroll, or funds may be involved, call the bank or other financial institution immediately using a known number. Request transaction review or recall where available and monitor for unauthorized activity.
- Preserve and assess evidence. Security staff should review sign-ins, MFA events, mailbox rules, forwarding settings, OAuth or application grants, endpoint alerts, downloads, and related accounts. Contain malware or unauthorized access promptly.
- Assess notification duties. Determine whether customer, supplier, employee, insurer, regulator, or law-enforcement notification is required. Requirements vary by jurisdiction and data type; do not assume a universal deadline.
NIST lists prompt reporting, password changes, financial-institution contact, and assessment of affected-party notification among the response steps. Joint guidance from CISA, NSA, the FBI, and MS-ISAC also emphasizes incident-response planning and promptly identifying and remediating successful phishing attempts; consult the 2025 joint phishing guidance.
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First 30 days: close the most dangerous gaps
- Inventory privileged, finance, executive, email, and sensitive-data accounts.
- Turn on MFA for every supported high-risk account.
- Identify which critical services support FIDO2/WebAuthn and select a pilot group.
- Publish the independent-verification and reporting rules.
- Confirm emergency contacts for IT, security, finance, legal or privacy, and leadership.
- Check that email filtering, sender-authentication controls, endpoint protection, and automatic updates are enabled.
Days 31–60: deploy and practice
- Enroll phishing-resistant authenticators for administrators and other high-impact users.
- Document enrollment, replacement, revocation, and recovery, then test the process with a lost device.
- Remove unnecessary administrator rights, stale accounts, and shared credentials.
- Run a tabletop exercise involving a fake executive payment request and a compromised mailbox.
- Teach staff how to report email, text, voice, social, and physical phishing attempts.
Days 61–90: expand and measure
- Extend stronger authentication to additional sensitive applications and suppliers where supported.
- Run appropriately scoped simulations and interpret results using message difficulty, including the Phish Scale where useful.
- Review sign-in, MFA, mail, endpoint, and financial-alert logs for blind spots.
- Test an account-recovery and authenticator-replacement scenario.
- Update the incident plan, supplier verification procedures, and employee training from the exercise findings.
Measure whether the controls work
Track operational evidence rather than a single “phishing rate.” Useful measures include the percentage of privileged and sensitive accounts using phishing-resistant MFA; time to revoke a lost authenticator; time from employee report to triage; number of reports from non-email channels; percentage of high-risk mailboxes covered by filtering and sender authentication; patch and endpoint-protection coverage; completion of independent callbacks for payment changes; and time to contain a confirmed account compromise.
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Common mistakes that leave gaps
Relying on grammar as the detector
Well-written text is not proof of legitimacy. Use the requested action and independent verification rule instead.
Deploying MFA but ignoring the factor type
An attacker may still relay a manually entered OTP or manipulate an unexpected push approval. Prioritize WebAuthn/FIDO2 for privileged and sensitive access, and document the limitations of any fallback.
Buying keys without planning recovery
A hardware key protects an account only if it is enrolled correctly and can be replaced or revoked. Define spare-key, lost-key, device-change, and help-desk procedures before broad deployment.
Training only email behavior
Voice, text, social, collaboration, and physical channels can all initiate the attack. Give employees one reporting process that covers each route.
Waiting for certainty before reporting
Early reporting is more valuable than a perfect diagnosis. Treat a suspected click, credential entry, unexpected approval, or payment change as an event worth escalating.
Assuming a successful phish ends when the password changes
Investigate active sessions, mailbox forwarding rules, OAuth grants, downloaded malware, secondary accounts, and financial activity. Contain any related access and determine whether others were affected.
Quick Recap
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