A familiar voice is not an authentication factor. A useful deepfake-readiness drill tests whether employees will stop an urgent request, verify the person through a channel the caller cannot control, refuse to send money, credentials or MFA codes, escalate the attempt and preserve evidence.
Build the exercise around the attack chain people now face: an AI-generated call or voice memo, pressure to act quickly, a request to switch messaging platforms, a malicious link, or a demand for money or account access. Keep the exercise controlled—never use real funds, passwords or live MFA codes—and measure behavior rather than whether a detector identifies the audio.
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Why a cloned-voice drill belongs in your incident plan
The FBI’s May 15, 2025 alert described malicious actors impersonating senior U.S. officials since April 2025 with text messages and AI-generated voice messages. The FBI’s warning is relevant to any organization whose staff can approve payments, reset accounts, disclose information or act on an executive instruction.
IC3’s December 3, 2024 public service announcement says AI-generated audio can impersonate relatives or public figures, demand urgent financial assistance and help criminals obtain bank access. In a business, the same pattern can target payroll, procurement, customer-support staff, executives and help desks.
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The exercise should therefore test a human decision path, not a technical parlor trick. A caller may sound exactly like the chief financial officer, but the voice still does not prove identity. MFA remains important for account security, yet an MFA prompt or code cannot authenticate the person speaking; never read a code to a caller or message sender.
FBI Special Agent in Charge Robert Tripp summarized the threat: “As technology continues to evolve, so do cybercriminals’ tactics. Attackers are leveraging AI to craft highly convincing voice or video messages and emails to enable fraud schemes against individuals and businesses alike.”
Set the objective and pass conditions
Write the objective before creating the scenario. The drill should establish whether participants can recognize an urgent cloned-voice request, interrupt the conversation, verify identity independently, refuse unsafe actions, report the attempt and preserve useful evidence.
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- Stops the transaction or conversation without clicking, downloading, transferring funds or disclosing information.
- Uses a known-good telephone number or another preapproved channel found independently of the incoming message.
- Reports the event to the designated security and finance contacts.
- Records the time, channel, number or account, request and any link without altering the original evidence.
- Explains who can freeze a payment or account and who has authority to notify legal, communications, insurers, regulators, law enforcement or the FBI’s Internet Crime Complaint Center.
There is no universal pass score or industry-wide voice-clone accuracy threshold. Set thresholds that fit your payment approvals, account-recovery process and risk tolerance, then repeat the exercise after corrective work.
Build a realistic but controlled inject
Choose the target and request
Use a synthetic voice message or a facilitator reading a script that claims to be an executive, supplier, colleague or family contact. Select an action that matters to the target group: changing bank details, approving a wire, sending a document, resetting an account or sharing an MFA code.
Include one or more cues identified in FBI guidance: a new phone number or messaging platform, unusual urgency, a request for money or credentials, a malicious link, or a demand for an MFA code. A credible sequence might begin with a voice memo, move to text, ask the employee to continue on Signal, WhatsApp, Telegram or another service, and end with a payment instruction or link.
Protect employees and real accounts
Do not use a real employee’s private voice sample without explicit authorization. Use a clearly controlled exercise asset, label the exercise internally to the small group that must know, and arrange a stop mechanism for facilitators. Never collect real passwords, MFA codes, personal data or payment details. Use dummy accounts, fictional invoices and reversible test records.
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Run the drill step by step
- Deliver the first contact. Send the voice memo or place the facilitator call to a small pilot group. Start the exercise log when the message is delivered.
- Observe without coaching. Record whether each participant acts, pauses, asks a question, ends the call, seeks verification or reports the message. Capture timestamps and decisions, not private content that is unnecessary for the exercise.
- Expect an immediate pause. The safe response is to stop the conversation, avoid clicking or downloading, and avoid sending money, credentials, sensitive files or MFA codes.
- Force independent verification. The participant should hang up or end the chat, locate a known-good number in the company directory or another independently obtained source, and call back. Do not let the incoming caller supply the number or verification link. The FBI specifically recommends independent verification because a cloned voice can sound nearly identical to the real person.
- Test escalation. Ask the participant to notify the defined security and finance contacts. Test who can freeze a transfer, suspend an account, contact the purported executive or supplier, and approve external notifications.
- Preserve evidence. Have the participant retain the original audio or message, headers or metadata when available, originating number or account, timestamps, payment instructions, links and a transcript. Do not forward the message in a way that strips metadata if your process can preserve the original.
- Deliver a second inject. After the first report, send a follow-up SMS that asks the participant to move to another platform or open a link. This tests recognition of a campaign rather than a single suspicious call.
Use a clear pause-and-escalate rule
Employees need a short script they can use under pressure: Stop. Do not click or download. Verify through a known channel. Notify security and finance. Preserve the evidence. Put the rule in payment procedures, help-desk scripts, executive-assistant guidance and remote-work instructions.
Make the callback directory resilient to the attack. A number copied from the incoming message is not independent verification. Staff should use a directory, a previously verified contact record or an in-person confirmation path. For high-value payments or account recovery, require a second approver using a separate channel.
Explicitly state that MFA codes are secrets. An employee should reject any request to read a code aloud, enter a code on a caller’s instructions or approve an unexpected prompt. The drill should record whether the participant recognized this even when the caller sounded familiar.
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Debrief against decisions, not personality
Hold the debrief soon after the exercise while timestamps and reasoning are fresh. Review recognition time, completion of the callback, escalation accuracy, evidence quality and any unsafe action. Ask which policy, directory entry or approval step would have made the correct decision easier.
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Remediate the specific gaps you observed:
- Update call-back directories and alternate contacts for executive absences, travel and supplier changes.
- Clarify payment-change and account-recovery approval rules, including who can freeze activity.
- Rewrite MFA guidance to prohibit disclosure of codes and approval of unexpected prompts.
- Improve intake and evidence-preservation procedures for voice messages, SMS, email and collaboration platforms.
- Train assistants, finance, customer support, help-desk and senior leaders, not only the security operations team.
- Repeat the scenario after remediation, changing the channel or requested action to test whether the behavior transfers.
Include leadership and continuity stakeholders
CISA’s tabletop guidance recommends participation by senior management and stakeholders involved in major incidents. Invite the people who authorize payments, manage accounts, communicate with customers, handle legal obligations, contact insurers and maintain business continuity. A technically correct alert is not enough if nobody can stop a transfer or reach the real executive.
The joint NSA, FBI and CISA deepfake bulletin, issued September 12, 2023, describes agency collaboration during 2021 and 2022 on preparation and response practices. Use that same cross-functional mindset: the exercise should reveal decision ownership, backup contacts and continuity options when a trusted channel is under suspicion.
Where detection and watermarking fit
The FTC groups voice-cloning defenses into upstream authentication, real-time detection or monitoring, and post-use evaluation of existing audio. It reports a range of detection efficacy, warns that watermarks can be removed or altered, and says “there’s still no silver bullet to prevent the harms posed by voice cloning.”
Treat a detector, watermark or platform warning as a signal that triggers human verification—not as authorization to pay, disclose information or reset an account. Compare controls using the same questions during your review:
| Control question | What to examine |
|---|---|
| Independence | Can the control verify identity without relying on the possibly compromised voice channel? |
| Social-engineering resistance | Does it still work when the request is urgent, emotional or backed by convincing personal details? |
| Coverage | Does it protect payments, credentials, MFA, account recovery and sensitive data? |
| Usability | Can staff complete it under time pressure without bypassing the process? |
| Auditability | Does it leave a record of who verified, how and when? |
| Error impact | What happens if it produces a false positive or misses a convincing fake? |
| Deployment burden | Who maintains directories, tooling, training and escalation coverage? |
| Channel coverage | Does it work across phone, SMS, email and collaboration platforms? |
If the drill uncovers a real incident
Stop the requested action and contact security and finance immediately. Preserve names, phone numbers, addresses, email addresses, transaction dates and amounts, account details, receiving institutions, cryptocurrency addresses where relevant, the initiating channel, the exact request and what information was disclosed. IC3 identifies these details as useful for a report; follow your organization’s legal, regulatory and law-enforcement notification process.
Do not delete the original message or rely on a screenshot alone when the original audio, headers or metadata can be retained. Record containment actions and any payment-recall or account-protection steps while the timeline is clear.
What success looks like
A successful drill does not prove that employees can identify synthetic audio by ear. It proves that a convincing voice cannot bypass independent verification, dual control, escalation and evidence preservation. Detection technology can add another warning layer, but the authorization decision must rest on a channel and process the caller cannot impersonate.
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