Wire transfer fraud is one of the fastest-growing threats facing mid-sized businesses today. It’s no longer confined to high-profile cases involving multinational corporations or banks.
Cybercriminals are increasingly targeting companies that handle regular vendor payments, process international transfers, or operate across multiple departments — especially those without strong internal controls or cybersecurity oversight.
These attacks often fly under the radar. In many cases, the transfer is initiated by someone inside the organization using what appears to be valid instructions. However, the reality is far more complex.
The most common tactic, Business Email Compromise (BEC), relies on compromised accounts, email impersonation, and social engineering to redirect funds to fraudulent accounts.
In recent months, we’ve worked with clients who were minutes away from transferring six- and seven-figure sums to threat actors posing as trusted partners. In several cases, attackers had been quietly monitoring email traffic for weeks.
These aren’t random phishing scams. They are targeted, patient, and often devastating.
To protect your business, it’s critical to understand how these fraud attempts work — and how to stop them before money leaves the account.
Common Tactics Used by Attackers
Attackers rarely start by asking for money. They begin by gaining access or building trust.
The Most Common Methods Include
- Business Email Compromise (BEC): Attackers gain access to a legitimate account, often through credential stuffing or phishing, then monitor communication until the right moment to intervene. Poor password management best practices, like reusing passwords across multiple platforms or storing credentials in unsecured locations, make initial account compromise significantly easier for attackers conducting BEC attacks
- Spoofed Emails or Domains: Lookalike domains or slight variations (e.g., using “.co” instead of “.com”) trick employees into thinking emails are coming from internal stakeholders or known vendors.
- Email Forwarding Rules: Once inside, attackers create hidden rules to forward copies of emails to external addresses. This allows them to quietly monitor conversations without alerting the user.
- Fake Invoices or Bank Detail Updates: Fraudsters impersonate vendors or internal executives to provide “updated” payment instructions — often with urgency or confidentiality to bypass standard approvals.
- Vendor Impersonation: Sometimes, attackers compromise a vendor’s system first and then use that access to attack downstream clients.
These tactics work because they exploit trust, routine, and the email systems employees use daily without suspicion.
Case Study: A Real-World Business Email Compromise
One of our clients, a manufacturing firm, received an email that appeared to be from their CFO, authorizing a wire payment to a newly onboarded vendor. The email was brief, to the point, and referenced internal project details that only the CFO should have known. It even matched the tone and formatting of previous messages.
Real-time behavior monitoring, around-the-clock threat detection, and managed endpoint protection stopped the transaction. These tools flagged suspicious activities, and we were able DMA to intervene before any money was transferred.
Our investigation found that a phishing link had compromised the CFO’s email weeks earlier. The attacker logged in, set up hidden mailbox rules, and quietly watched for financial activity. Once the right moment came, they mimicked the CFO’s communication style and inserted new banking details for a legitimate payment.
The lesson: Attackers often enter systems long before the fraud attempt is made. Preventing wire fraud isn’t about catching a suspicious email — it’s about removing blind spots and closing the technical gaps that make these attacks possible in the first place.
Technical and Procedural Protections
Preventing wire fraud requires a layered defense: technical controls, user education, and strong internal protocols.
The Most Effective Protections We Recommend
Harden Your Email Infrastructure
Implement DMARC, SPF, and DKIM to authenticate senders and prevent domain spoofing. These records reduce the chance of malicious emails appearing to come from your domain. Proper DMARC enforcement not only protects your organization from inbound spoofing but also prevents attackers from abusing your domain to target clients, partners, or employees.
Enforce Multi-Factor Authentication (MFA) Everywhere
MFA is a baseline requirement but must be implemented correctly and monitored. Attackers can exploit legacy authentication or bypass MFA through token theft if protections aren’t complete.
Conduct Regular Mailbox Rule Audits
Many BEC attacks involve silent inbox monitoring via forwarding or filtering rules. A quarterly audit of mailbox configurations should be a standard part of your security checklist.
Implement Strict Wire Transfer Protocols
- Require verbal verification from a known contact for all payment requests above a specific threshold.
- Never rely solely on email for bank detail changes — always verify through a secondary channel.
- Limit who can initiate or approve wires and log every change request.
Train Your Staff on Real-World Scenarios
Generic phishing training isn’t enough. Your team should know how fraud attempts unfold in your specific environment. Simulations and short refreshers are more effective than annual webinars.
Use Endpoint and Cloud Security Tools That Catch Lateral Movement
Deploy Endpoint Detection and Response (EDR) and cloud monitoring solutions to detect unusual login behavior, privilege escalation, or suspicious rule changes in Microsoft 365 and Google Workspace.
Take Preventive Measures Against Wire Fraud
Wire fraud doesn’t happen in a vacuum. It occurs when attackers exploit weak spots in systems, people, and processes — and it’s happening more often than most businesses realize.
The cost isn’t just financial. A successful attack can erode trust with partners, trigger compliance issues, and create long-term operational headaches.
Cybersecurity must be more than a checklist. If your organization processes wire transfers or handles vendor payments, now is the time to revisit your internal protocols and security stack.
Even small changes — like auditing email rules or tightening verification workflows — can make the difference between catching fraud and funding it.
Learn more about how to prevent wire fraud.
