What Business Email Compromise Really Costs You
Business email compromise can turn one convincing message into a six-figure loss, days of disruption and a difficult recovery effort. Criminals study how an organization communicates, then impersonate executives or trusted suppliers to redirect legitimate payments.
The direct financial loss may be only the beginning. Legal advice, incident response, delayed projects and damaged supplier relationships all raise the final bill. Effective protection therefore depends on coordinated email security, payment controls and verification procedures.
Anatomy of an Executive Impersonation
An executive impersonation attack often begins with research. Criminals review company websites, professional profiles and public announcements to identify senior leaders, finance employees and payment cycles. They may register a similar-looking domain or compromise a real mailbox, then send an urgent request while the executive is traveling or unavailable.
A message might instruct a finance manager to transfer $75,000 before a confidential acquisition closes. The sender discourages calls and stresses personal accountability. These common BEC tactics exploit authority, urgency and secrecy. Train employees to treat those signals as reasons to pause. Staff should inspect the full sender address, confirm unusual requests through another channel and report suspicious messages without fear of delaying legitimate work.
Where Email Gateways Fall Short
Email gateways can block malicious attachments, known phishing domains and messages that fail authentication checks. Yet many BEC emails contain no harmful file or obvious link. A carefully written request sent from a compromised supplier account may look technically legitimate to automated filters.
Organizations need controls that assume some deceptive messages will reach an inbox. Configure warnings for external senders and newly registered domains, then monitor mailbox rules and unusual sign-in activity. Finance teams should also reconcile payment records quickly, since early detection improves the chance of stopping or recovering a transfer.
Businesses that need stronger oversight of cash flow and financial obligations can involve their accountants in reviewing approval processes, reconciliations and reporting lines. Email security and financial governance work best when teams share warning signs instead of operating separately.
Designing Internal Wire Controls
Build payment controls around separation of duties. The person creating a new payee should not be able to approve and release the same transfer. Set approval thresholds based on risk, with extra scrutiny for first-time recipients, overseas accounts and payments outside normal patterns.
A practical process might require two approvers for transfers above $10,000 and verbal confirmation for any urgent request from an executive. Keep approved contact details in a protected system, not in the email requesting payment. Record who requested, verified and authorized each transaction so reviewers can trace the decision later.
Employees also need a clear response plan. The Secret Service BEC guidance advises victims to contact their financial institution immediately and report the incident. Your plan should identify who can call the bank, preserve messages and sign-in records and notify internal security staff.
Verifying Vendor Bank Changes
Treat every request to change a vendor’s bank details as a potential fraud attempt, even when it arrives inside an existing email thread. A compromised mailbox gives criminals access to invoice history, writing style and real employee names. That context can make a false request unusually convincing.
Call the vendor using a number already stored in your procurement or accounting system. Ask a known contact to confirm the account change and document the call. If the vendor cannot be reached, hold the payment. A short delay costs far less than sending funds to an account controlled by a criminal.
Review vendor records regularly and flag duplicate account numbers, sudden address changes and payments that break established patterns. The most valuable control is a simple rule that no email alone can authorize new payment details. When urgency rises, verification should become stricter, not faster.