BEC is pure social engineering, not malware. Attackers do their homework: scraping LinkedIn profiles, registering spoofed vendor domains, and studying a company's accounts payable workflow before they ever send an email. In some cases, they skip spoofing entirely and compromise a real vendor's email account, then insert themselves directly into an existing thread, replying from a legitimate inbox the target already trusts with a "quick change" to payment instructions.

Because there's no attachment or link to flag, these emails routinely slip past scanners built to catch malware. That's what makes BEC different from ordinary phishing, and why stopping it depends on human judgment, verification steps, and identity monitoring rather than spam filters alone.

BEC scam example: spoofed domains

A classic version of this attack starts with a domain that looks right at a glance. You might receive an email that appears to come from LegitConstruction.com, but it actually originates from Legit-Construction.com, a lookalike domain with one extra character most people won't notice in a busy inbox. The hacker will also use a friendly display name, something like "Legit Construction Accounts Payable," so the message looks legitimate at a glance in your email client. From there, they email accounts payable with an "updated" bank account for an upcoming invoice payment. The domain looks close enough that nobody double checks it, and the funds go straight to the attacker.

If you believe you've identified or fallen victim to a BEC attack, act fact. Notify your bank, management, and any other involved parties right away so they can attempt to recover any lost funds.

Recognize BEC red flags

Common signs of a BEC attempt include:

• Urgency: Pressure to act immediately, like "send this in the next hour"

• Domain spoofing: A sender address that looks close to a trusted domain but isn't quite right

• Off-hours timing: Requests that arrive outside normal business hours or right before a holiday

• Sudden bank detail changes: A vendor or executive asking to update payment information out of nowhere

• Mismatched wire instructions: Details that don't match past vendor communication

• Private email accounts: A message from a personal Gmail or similar address standing in for a work account, sometimes claiming trouble with the corporate one

• New forwarding rules: Rules quietly added to an executive's mailbox to redirect or hide messages

Any one of these signs alone might be nothing. Several together are worth a second look before anyone acts on the email.

Enforce MFA and email authentication

Approval workflows and verification steps can intervene before a request lands in someone's inbox. Multi-factor authentication (MFA) and email authentication help stop the attacker from getting that far in the first place. MFA stops the vast majority of credential-stuffing attempts, so it should be non-negotiable across email and financial systems. Pair that with DMARC, DKIM, and SPF configured correctly on your domain, along with filters that block lookalike domains and flag mismatched reply-to addresses. 

These are the same tricks that make spoofed-domain scams like the one above work in the first place, and they're the technical backbone of any approval process or email security policy.

Train employees to spot and report BEC

The best processes in the world only work if employees follow them, and that only happens with real training, not a slideshow they sit through once a year. Ongoing security awareness training, including simulated phishing and social engineering scenarios based on real-world threats, teaches staff to recognize red flags and report suspicious messages before clicking or replying, not after.

Huntress Managed Security Awareness Training delivers short, story-driven cybersecurity episodes and phishing simulations built on current threat intelligence from millions of endpoints and identities, plus features like Phishing Defense Coaching and behavior-based assignments, so the habit sticks long after the training is over.

Just because someone isn't in the accounting department doesn't mean they won't be targeted. Practice makes perfect; don't let the first time your organization deals with a BEC attempt be under real conditions.

Even strong prevention won't catch everything, so it helps to know what an attack in progress looks like:

• Timing anomalies: Requests sent outside business hours or right before a holiday

• Financial red flags: An unexpected bank detail change or a payment reroute framed as urgent

• Technical markers: New forwarding rules on an executive's mailbox, logins from impossible travel patterns, or a sudden spike in failed MFA attempts

Any of these on their own can be explained away. Together, they're usually a sign someone is already inside.

The most resilient organizations don't rely on policy alone. They pair strong internal workflows with identity monitoring that catches attackers even when an employee doesn't.

That's the role Huntress Managed ITDR plays: It continuously monitors Microsoft 365 and Google Workspace identities and email environments 24/7, detecting and responding to identity-based threats like account takeovers, business email compromise, unauthorized logins, malicious inbox and forwarding rules, rogue OAuth apps, and location-based anomalies, with an industry-leading ~3-minute mean time to respond and a false positive rate under 5%, so alerts stay meaningful instead of becoming noise.

Huntress Managed SAT backs that up on the human side, delivering engaging, story-driven training and phishing simulations based on real-world threats, managed for you and powered by proprietary threat intel from millions of endpoints and identities, so employees build the instinct to spot and report a BEC attempt before it turns into a wire transfer.

Huntress Managed EDR covers what happens if an attacker's next move involves credential-harvesting malware or other endpoint footholds, with comprehensive endpoint protection, behavioral detections, and active remediation across Windows, macOS, and Linux endpoints—and an industry-leading ~8-minute mean time to respond  to minimize business impact.

All three run through the Huntress Managed Security Platform, a unified, agentic managed security platform that weaves together data across endpoints, identities, logs, and learners to strengthen endpoint integrity, identity resilience, and operational readiness through one view—so lean IT teams can see and act on identity, email, and endpoint threats without stitching tools together themselves.

To see Huntress in action, you can schedule a demo or start a free trial and put Huntress to work for your team.