Unlike spray‑and‑pray phishing that relies on infected attachments, BEC is pure social engineering. Attackers do their homework—scraping LinkedIn profiles, spoofing vendor domains, and studying your accounts payable workflow. Sometimes, they’ll even compromise the email account of an upstream vendor that you work with and use that to insert themselves into existing email conversations. 

To pull off the scam, attackers wait for the perfect moment and send a single, well‑crafted email—perhaps a fake invoice that appears to come from a trusted supplier, a sudden request from “the CEO” to change bank details, or an urgent payroll update landing in your finance team’s inbox just before payday.

Since there’s no malicious link or attachment involved, many email scanners give the email a free pass, which is why email fraud prevention must lean on human intuition, identity controls, and layered monitoring.

1. Enforce MFA and harden email filters

Start with the basics. Multi‑factor authentication stops 99% of credential‑stuffing attempts. Pair that with advanced phishing and spoofing filters that check DMARC, DKIM, and SPF records. If you truly want to secure your email, block look‑alike domains, and flag messages with mismatched reply‑to addresses.

2. Give employees the tools to spot the con

Security awareness isn’t an annual slideshow. It’s an ongoing habit. People are either your biggest risk or your strongest firewall. Security awareness training can help staff recognize telltale BEC signals—poor grammar, odd timing, or unusual urgency. Simulated attacks reinforce those lessons so employees will (instinctively) report phishing scams before clicking or replying. Huntress Managed Security Awareness Training delivers short, punchy lessons and simulated BEC emails so your team learns by doing. Learn all about it here. 

3. Dual‑key authorization for big money moves

Think of large wire transfers like opening a vault—one key isn’t enough. Require two approvers—ideally from separate departments—for payments over a certain preset threshold you determine. Even if one employee falls for the scam, the second authorizer is your fail‑safe to stop business email compromise in its tracks. And then you get to imagine your attacker slamming their clammy fists down on their laptop and swearing their head off.

4. Tighten help desk verification

BEC actors often call your support line pretending to be a traveling executive who—gosh, wouldn’t you know—“can’t access their email for some reason.” Stop them cold by adopting non‑repudiable verification: out‑of‑band callbacks to known numbers, employee badges, or secondary email confirmations. If they can’t prove they’re real, no password reset.

5. Treat every unexpected email as suspicious

In today’s threat environment, consider all unsolicited messages guilty until proven innocent. If you didn’t ask for it, and you weren’t expecting an attachment, handle with extreme caution. This suspicious mindset helps prevent BEC attacks by forcing an extra verification step before money or data leaves the building, so you don’t find yourself caught in a trap.

So, how do you detect a business email compromise? Look for anomalies that stand out against normal patterns:

• Timing anomalies: Requests outside business hours or right before holidays
  
  

• Financial red flags: Bank detail changes or urgent payment re‑routes (e.g., “Send payment in the next hour!”)
  
  

• Technical markers: Forwarding rules added to an executive’s mailbox, impossible‑travel logins, or a sudden spike in failed MFA attempts

Even with strong defenses, attackers occasionally sneak one past the goalie. Here’s your rapid‑response sequence:

1. Freeze the funds: If money got moved, call your bank’s fraud unit ASAP. Many transfers can be recalled if flagged within the first few hours.
   
   

2. Lock the account: Rotate passwords, force sign‑outs, and terminate any active sessions associated with the compromised identity.
   
   

3. Mine the logs: Preserve original headers, mailbox rules, and endpoint logs. They’ll tell you how far the attacker infiltrated and what else they touched.
   
   

4. Run full forensics: Use EDR to hunt for local script executions or credential‑harvesting malware—and isolate any infected devices (if needed).
   
   

5. Notify your stakeholders: Transparency always beats secret chaos. Inform leadership, affected vendors, and—if personally identifiable information is involved—legal counsel for compliance reporting.

Thinking through how to prevent BEC attacks becomes simpler with Huntress:

• Huntress Managed ITDR watches identity signals 24/7, alerting on suspicious inbox rules, MFA changes, or unusual login geography.

• Huntress Managed Security Awareness Training keeps staff sharp, reducing click‑through rates and speeding incident reporting.
  

• Huntress Managed EDR provides endpoint insight, catching silent malware that installs after credential phishing.

Together, these layers give you continuous monitoring, immediate alerts, and human‑led analysis, turning BEC from an existential threat into just another ticket closed.

Ready to see it all in action? Schedule a Huntress demo or start your free trial and put Huntress to work for your team.