Real estate teams should treat email as a high-risk channel for closing instructions. Use multifactor authentication, verify any wiring change through a known phone number or in person, and never rely on contact details supplied in the message itself. Because attackers exploit urgency and legitimate-looking transaction details, the safest control is a hard verification step before any funds move.
Why email-based closing instructions are such a common fraud target
Email is convenient for real estate closings, but it is also easy for attackers to impersonate a lender, attorney, title company, or buyer and insert a last-minute wiring change. The fraud succeeds when teams trust the message content more than the communication path. That makes the real control problem verification, not just message filtering.
Wire fraud often works because the message looks routine, references a real transaction, and creates urgency. A compromised mailbox, spoofed sender, or lookalike reply chain can be enough to steer funds to an attacker-controlled account unless the team verifies the instruction out of band before acting.
For this reason, the safest operating assumption is that any email requesting payment changes, new bank details, or revised closing instructions is untrusted until confirmed through an independently obtained contact method and a documented approval step.
What controls reduce the chance of a fraudulent wire
The strongest practical controls are layered. Multifactor authentication helps protect the mailboxes and portals used in the transaction, but it does not make an emailed wiring instruction inherently safe. Teams still need a separate confirmation process for any change to funds movement, especially when the request arrives late in the process or includes pressure to act quickly.
- Verify wiring changes using a known phone number or an in-person confirmation, never the contact details in the email itself.
- Require two-person review or managerial approval for any change to payment instructions.
- Treat bank-account changes, destination changes, and urgent deadline updates as high-risk events that pause execution until confirmed.
- Use secure, recorded procedures so staff can prove that verification happened before money moved.
That hard verification step matters because the attacker’s goal is usually not to break the email system, but to exploit the business process around it. If the process allows a single employee to accept an emailed update and forward it to wiring without challenge, the fraud path remains open even when the mailbox itself is protected.
How teams should operationalize verification at closing
The best teams make verification routine, fast, and non-negotiable. Every person involved in the transaction should know that wiring instructions are never accepted from an email alone, and that any exception requires escalation. The process should be simple enough that staff do not invent shortcuts under deadline pressure.
This is where governance and access discipline matter in practice: limit who can approve changes, define what counts as a valid callback source, and make sure the team can distinguish a true instruction from a message that merely looks familiar. If the transaction is high value or time-sensitive, the verification path should be even stricter, not looser.
One useful benchmark is whether a member of staff can explain, without hesitation, exactly how a disputed instruction is confirmed, who is authorized to approve it, and what evidence is retained after confirmation. If that answer is vague, the fraud control is probably too informal to rely on.
Risk and Threat Considerations
Wire fraud risk rises when teams rely on the apparent legitimacy of an email thread, because attackers can exploit urgency, mailbox compromise, and social engineering to redirect funds without triggering obvious technical alarms. The danger is not limited to spoofing; a real sender account that has been taken over is often more convincing than a fake one.
Failure mechanism: The attacker injects or modifies closing instructions, then uses time pressure and trust in the existing transaction to bypass manual skepticism. If staff reuse contact details from the message itself, the attacker controls both the instruction and the verification path.
Impact: Funds can be sent to the wrong account, the transfer may be irreversible or hard to recover, and the firm may face client loss, operational disruption, and reputational damage. In many cases, the fraud is detected only after settlement has already occurred.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-2 — Identification and Authentication (Organizational Users) | Covers protecting staff mail access used to approve closing instructions. |
| IA-5 — Authenticator Management | Covers protecting and rotating authenticators that guard mailboxes and approval channels. | |
| AC-2 — Account Management | Supports limiting who can approve payment instruction changes and closing actions. | |
| Recommendation — Require strong multifactor authentication for staff who handle closing instructions. Manage and rotate authenticators for email and approval systems on a defined schedule. Restrict approval rights to a small, explicitly managed set of accounts. | ||
| CIS Controls v8 | CIS-5 — Account Management | Helps govern mailbox and approval access used in closing workflows. |
| CIS-8 — Audit Log Management | Supports preserving evidence of instruction changes and verification actions. | |
| CIS-9 — Email and Web Browser Protections | Directly addresses email as the fraud delivery channel. | |
| Recommendation — Limit access to closing accounts and remove unused approvals quickly. Collect and retain logs for all wiring instruction changes and approvals. Harden email protections to reduce spoofing, phishing, and malicious link exposure. | ||
| MITRE ATT&CK | T1566 — Phishing | Wire fraud commonly starts with phishing or spoofed email instructions. |
| T1114 — Email Collection | Mailbox compromise can let attackers observe or alter closing threads. | |
| T1585 — Establish Accounts | Attackers may create lookalike identities to impersonate transaction parties. | |
| Recommendation — Map suspicious closing emails to phishing detection and awareness workflows. Monitor for mailbox compromise that could alter closing communications. Hunt for lookalike sender accounts used to impersonate closing parties. | ||
Practitioner Guidance
What to verify: Verify that your process requires an independent callback or in-person confirmation for every payment-instruction change, and that staff are not allowed to treat an email reply as sufficient proof. If the verification source was provided inside the message, treat the control as failed.
Decision rule: If any wire detail changes after initial agreement, stop the transfer until a known contact path confirms the instruction and a second person records the approval. When the request is urgent, the safest response is to slow the process, not to relax it.
Practitioner takeaway: Email security helps, but it is not the control that stops wire fraud, the decisive safeguard is a disciplined out-of-band verification step before money leaves the account.
Related resources from NHI Mgmt Group
- How should security teams reduce invoice fraud risk in email workflows?
- How can security teams reduce the risk of email-based freight fraud?
- Why does real-time, phone-centric identity verification reduce fraud risk in online transactions?
- Why do eSignatures reduce risk in real estate transactions when they are paired with authentication and audit logging?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 26, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
