Stealth Technology Group Team
Accounts payable teams are a high-value target for business email compromise (BEC) because they routinely process invoices, communicate with vendors, and move money based on instructions that often arrive by email. A fraudulent request may look like a normal supplier message, a revised invoice, or a note from an executive asking for a time-sensitive transfer. The sender may even be using a real account that has been compromised, which makes simple checks for spelling errors or suspicious addresses insufficient on their own. The FBI explains how these scams impersonate trusted contacts and redirect legitimate payments in its guidance on business email compromise.
Effective business email compromise prevention depends on treating payment instructions as financial controls, not just email correspondence. Every change to vendor banking details should be verified through a second, independently trusted channel. High-risk payments should require more than one approver, and staff should know how to pause a transaction without being penalized for delaying an urgent request. These safeguards work best when paired with a broader managed cybersecurity program and clearly documented IT services and support processes.
The objective is not to make accounts payable slower or more complicated. It is to make fraudulent changes difficult to submit, easy to question, and unlikely to pass through unnoticed. The following practices combine payment workflow controls, email security, employee training, and incident response into a practical approach for organizations that want to protect cash flow and vendor relationships.
How Business Email Compromise Targets Accounts Payable Teams
BEC attacks exploit familiar business routines. A criminal may compromise a supplier’s mailbox, monitor an existing invoice conversation, and send a realistic message with “updated” banking details just before a payment is due. Another attacker may register a lookalike domain or impersonate a senior leader, claiming that a transfer must be completed immediately and confidentially. Because the request matches an expected business activity, an employee may process it without noticing that the destination account has changed. The FBI’s BEC overview describes vendor invoice and executive impersonation scenarios that illustrate this risk.
Common warning signs include an unexpected bank-account change, a new payment destination, pressure to bypass the usual approval process, unusual secrecy, a change in tone, or a request that arrives at an unusual time. But grammar and spelling are not reliable indicators by themselves. A message sent from a legitimate compromised account can appear completely normal. The FBI’s Internet Crime Complaint Center recommends checking sender addresses and verifying account changes through a separate communication channel; its BEC guidance is a useful reference for finance and IT teams.
Organizations should also review their underlying technology and operational processes. If an employee mailbox is compromised, attackers may create inbox rules to hide replies, monitor supplier conversations, or intercept payment confirmations. Stronger IT infrastructure management and proactive remote infrastructure monitoring can help teams identify suspicious account behavior before it becomes a financial loss.
Build a Reliable Vendor Bank-Detail Verification Process
The most important rule is simple: never change a vendor’s payment information based on email alone. When a supplier requests new banking details, pause the change and call a known contact using a phone number already stored in the vendor master record or verified through previous trusted correspondence. Do not use a phone number, link, or alternate contact supplied in the change request itself. Ask the vendor to confirm the request and relevant details, then record who verified it, when verification occurred, and how the confirmation was obtained.
Separate verification from data entry wherever possible. One employee can receive the request, a second can validate it through the established channel, and an authorized approver can release the change in the finance system. Require the same process for changes to remittance addresses, payment methods, contact details, and payment notification email addresses. For a new vendor, independently validate the business and banking information before creating the supplier record. The FTC’s business guidance on scams targeting small businesses also recommends clear invoice approval procedures and careful review of unfamiliar bills.
Write the verification policy down and make it easy to follow under pressure. Define what counts as a high-risk change, which roles can approve it, and what evidence must be retained. Keep vendor master-file permissions limited to staff who need them, and review changes periodically for unusual patterns. For organizations that need broader operational support, a structured managed IT services approach can help align access permissions, audit trails, and business processes.
Strengthen Payment Approvals and Separation of Duties
A secure payment process should prevent any one person from requesting a vendor change, entering it, approving it, and releasing the funds without independent oversight. Use dual approval for new beneficiaries, bank-detail changes, unusually large payments, and transactions that deviate from normal patterns. Set approval thresholds based on the organization’s size and risk, and make sure emergency exceptions are documented and reviewed after the fact.
Payment systems should flag first-time payees, duplicate invoice numbers, mismatched purchase orders, unusual amounts, and requests that arrive outside normal cycles. Finance teams should reconcile bank activity regularly and compare payment records with approved invoices and purchase orders. Controls are particularly important when employees are covering for colleagues, working remotely, or processing payments near weekends and holidays. The National Credit Union Administration has published guidance on BEC in cloud email environments, including recommendations to verify payment changes by known phone numbers and alert on suspicious account activity: BEC guidance for cloud email services.
Document the control owner for each step, and test the process periodically with realistic scenarios. If approvals exist only on paper, employees may bypass them when a message appears urgent. Make it clear that a pause for independent verification is expected behavior—not a failure to be responsive. Organizations can reinforce these procedures through business IT support services that account for real workflows, employee responsibilities, and the systems used to initiate payments.
Secure Business Email and Detect Suspicious Activity
Payment controls reduce the chance that a fraudulent request will succeed, while email security helps reduce the chance that an attacker can impersonate a trusted sender or take over a mailbox. Require multifactor authentication for email and other sensitive accounts, prioritize phishing-resistant methods where practical, and remove legacy authentication methods that bypass modern controls. CISA explains why organizations should enable MFA across email, financial services, and other important accounts in its guidance on multifactor authentication for businesses.
Configure anti-phishing and anti-spoofing protections, review SPF, DKIM, and DMARC settings for the company domain, and monitor for lookalike domains. Alert on unusual sign-ins, new forwarding rules, suspicious inbox rules, unexpected password resets, and changes to authentication methods. Disable automatic external forwarding unless there is a documented business need. Make it easy for employees to report a suspicious email without replying to it or forwarding it to colleagues unnecessarily.
Security technology should be configured, monitored, and maintained rather than simply purchased. Regular patching, endpoint protection, identity controls, and email filtering should work together as part of a layered defense. Stealth Technology Group’s cybersecurity services describe email security and phishing protection as part of a wider security program. For practical guidance on recognizing phishing tactics, teams can also use CISA’s phishing guidance.
Train Employees to Recognize Fraud and Respond Quickly
Accounts payable staff should receive focused training on payment fraud, not just general cybersecurity awareness. Use examples involving vendor bank changes, urgent executive requests, revised invoices, and messages that continue an existing email thread. Teach employees to inspect the full sender address, question unexpected urgency, and verify financial instructions through a known phone number or other approved channel. The FTC’s cybersecurity guidance for small businesses recommends clear internal verification policies for requests involving wire transfers and sensitive information.
Practice should include the right response when something feels wrong: stop the payment workflow, preserve the message, report it through the designated channel, and contact the finance or security lead. Employees should never be criticized for delaying a payment to complete a required verification. Managers should reinforce that attackers deliberately use urgency, authority, and secrecy to discourage questions.
If a payment has already been sent, act immediately. Contact the bank or payment provider and request a recall or other available recovery action; notify internal leadership and IT/security; preserve the original message and relevant logs; and report the incident to the FBI’s Internet Crime Complaint Center. The IC3 advises victims to contact their financial institution promptly and submit a report as soon as possible through IC3’s BEC reporting information. After the immediate response, review how the request passed through controls and update the procedure to prevent a repeat.
Conclusion
Business email compromise prevention works best when people, payment processes, and security technology reinforce one another. Independent verification of vendor changes, dual approval for high-risk transactions, protected email accounts, clear escalation procedures, and practical staff training can sharply reduce the likelihood that a convincing fraudulent request becomes a completed payment. No single tool replaces a disciplined process, and no employee should have to decide alone whether a suspicious payment instruction is legitimate.
Stealth Technology Group helps businesses strengthen the IT and cybersecurity controls that support safer day-to-day operations. If your organization wants to review email security, account protections, and payment-related workflows, contact Stealth Technology Group to discuss your environment. You can also call (617) 903-5559.
Related operational guidance: managed IT helpdesk practices can help route suspicious-message reports to the right people, while data backup and disaster recovery planning supports recovery if an incident disrupts business operations.
For a broader view of how support processes fit into security operations, see Stealth Technology Group’s and its IT outsourcing overview.
