Business Email Compromise: Prevention, Response, and More
Business email compromise (BEC) is typically the result of a successful phishing attack in which a criminal impersonates a trusted entity through email. After gaining trust, the attacker usually manipulates the recipient into taking an action that compromises security in some way.
Unfortunately, this attack is only becoming more common. According to the FBI’s most recent IC3 Report, BEC attacks were responsible for $3B in financial losses in 2025.
Clearly, businesses need to protect themselves from BEC attacks.
What does it take to achieve this?
What should you do if you sustain a BEC attack?
We’ve got all the answers below.
Key takeaways:
- Business email compromise (BEC) is the result of a phishing cyberattack in which a criminal impersonates a trusted entity to gain access to a system or execute financial fraud.
- BEC attacks can have significant consequences, including financial losses, reputational damage, and regulatory fines.
- BEC prevention requires a combination of technical controls and proper training for employees.
- If you suspect a successful BEC attack, you should contact your MSSP (managed security service provider) or internal cyber team immediately.
💡EXCLUSIVE Guide:
Phishing Email Examples
What is business email compromise?
Business email compromise (BEC) is a type of phishing attack in which a threat actor impersonates a trusted person or organization through email or related communication tools. The goal is to trick victims into transferring money, sharing sensitive information, or changing payment details. These attacks rely on social engineering rather than malware, often leveraging compromised email accounts, spoofed domains, or well-researched fake messages that appear legitimate and urgent.
Business email compromise attacks may impersonate any type of user. However, these personas are impersonated the most frequently:
- Executives
- Employees
- Vendors
- Business partners
What are the consequences of a successful business email compromise?
A successful business email compromise (BEC) can have significant and far‑reaching consequences for an organization because the attack targets trust, financial processes, and internal controls rather than technical vulnerabilities alone. Beyond immediate financial theft, BEC incidents often trigger operational disruption, regulatory exposure, and long‑term reputational damage, especially if sensitive data or customer funds are involved.
Here are some common consequences of a successful business email compromise.
- Direct financial loss: Unauthorized wire transfers, ACH payments, gift card purchases, or diverted invoice payments
- Low recovery rates: Stolen funds are often difficult or impossible to recover once transferred
- Data breaches: Exposure of sensitive financial, employee, or customer information
- Regulatory and compliance penalties: Fines or enforcement actions related to HIPAA, SOC 2, PCI-DSS, GDPR, or other regulations
- Operational disruption: Time and resources diverted to incident response, investigations, and system reviews
- Reputational damage: Loss of trust with customers, vendors, partners, or investors
- Legal liability: Lawsuits stemming from lost funds, exposed data, or contractual failure
- Increased insurance costs: Higher cyber insurance premiums or coverage exclusions following an incident
- Employee impact: Loss of confidence, increased stress, or disciplinary actions tied to policy failures
- Future attack risk: Attackers may target the organization again if weaknesses or successful tactics are identified
How does business email compromise work?
Business email compromise (BEC) works by manipulating human trust and business processes rather than exploiting technical vulnerabilities. Attackers impersonate a trusted individual—such as an executive, employee, or vendor—to convince the victim to take a legitimate‑looking but fraudulent action, most often sending money, changing payment details, or sharing sensitive information.
Here is the three-step process that most BEC attacks follow.
- Reconnaissance or initial access. The attacker researches the organization or gains access to a real email account, often via stolen credentials. The attacker may also use a look‑alike domain to appear legitimate.
- Targeted, context‑aware messaging. Carefully crafted emails reference real people, projects, or transactions. The emails use urgency or authority to pressure recipients into acting quickly.
- Exploitation of process gaps. The attack succeeds when a human user approves payment or data changes based solely on email communication. This allows the criminal to finalize the attack before it’s even detected.
What are the different types of business email compromise?
Business email compromise (BEC) encompasses several related attack types, each designed to exploit trust in specific business roles or workflows rather than technical vulnerabilities. While all BEC attacks use deception over email (or email‑like channels), they differ in who is impersonated, which processes are targeted, and the type of damage caused—ranging from direct financial theft to long‑term data exposure and operational disruption.
Here are the main types of BEC, the roles they commonly exploit, and their potential impact.
BEC Type | Role or Relationship Exploited | Potential Impact |
Executive impersonation (CEO fraud) | Senior executives or business owners | Unauthorized wire transfers, emergency payments, loss of funds, breakdown of trust in leadership communications |
Vendor or supplier invoice fraud | Accounts payable staff and trusted vendors | Financial loss, contractual disputes, damaged vendor relationships |
Payroll diversion | HR, payroll, or finance teams | Employee wages redirected, exposure of employee PII, payroll system audits and rework |
IT administrator compromise | IT administrators with access to sensitive systems | Ongoing internal fraud, data theft, lateral movement into other systems, increased risk of future attacks |
Attorney or advisor impersonation | Legal counsel, consultants, or financial advisors | Fraudulent transactions during sensitive events (mergers, litigation, real estate deals) |
Data theft / information harvesting | Finance, HR, executives, or customer service roles | Exposure of tax records, W‑2s, financial statements, or customer data |
E‑gift card or purchase scam | Executives’ assistants, junior staff, or remote workers | Financial loss, especially in organizations with limited spending controls |
Internal request fraud | Employees with operational authority | Unauthorized changes to account settings, vendor records, or internal approval workflows |
Business email compromise vs. phishing
Business email compromise (BEC) is the result of a sophisticated, highly targeted form of phishing. While many forms of phishing take a broad, high-volume approach, BEC applies the principles of phishing to specific individuals and organizations.
Here’s how BEC compares to phishing as an umbrella category.
Attribute | Business Email Compromise (BEC) | Phishing |
Primary goal | Steal money or sensitive business information | Steal credentials, deploy malware, or collect data |
Targeting | Highly targeted (specific executives, employees, or vendors) | Broad or semi‑targeted (large groups of users) |
Attack volume | Low volume, high impact per successful attempt | High volume, high impact per successful attempt |
Impersonation method | Compromised email accounts or spoofed executive/vendor emails | Fake emails posing as brands, services, or internal IT |
Level of reconnaissance | Extensive research into organization, roles, workflows | Minimal to moderate research |
Use of malware | Usually no malware; relies on trust and process abuse | Often includes malicious links or attachments |
Urgency and pressure | High urgency (e.g., “send now,” “confidential,” “last‑minute change”) with specific, realistic details | High urgency with generic details |
Common outcomes | Wire fraud, invoice fraud, payroll diversion, data disclosure | Credential theft, ransomware, spyware, account takeover |
Detection difficulty | Harder to detect; messages look legitimate and context‑aware | Easier to detect with filters and user awareness |
Financial impact | Typically very high per incident | Can range from very low to very high |
What are the signs of business email compromise?
Business email compromise (BEC) attacks often reveal themselves through subtle but telling changes in communication, payment requests, or behavior that fall outside normal business patterns. Because BEC relies on social engineering and trusted relationships rather than malware, the warning signs are frequently human‑centric—such as unusual urgency, secrecy, or process deviations—making them easy to miss unless employees are trained to recognize them.
8 common signs of business email compromise
- Unexpected or urgent payment requests. Messages that demand immediate wire transfers, ACH payments, or gift card purchases—especially with language like “urgent,” “ASAP,” or “do this now”—are a classic BEC indicator designed to bypass normal verification steps.
- Requests to bypass standard procedures. BEC emails often ask recipients to ignore approval workflows, skip secondary reviews, or keep the request confidential, exploiting fear of authority while avoiding internal controls.
- Slightly altered sender addresses or domains. Attackers may use lookalike domains or subtle spelling changes (e.g., replacing a lowercase “L” with an uppercase “I”) that can be hard to spot at a glance.
- Sudden changes to payment or banking details. Emails requesting updates to vendor bank accounts, remittance instructions, or direct‑deposit information, especially without prior notice, are common signs of invoice or payroll fraud.
- Unusual tone or writing style from a known sender. Messages that feel out of character for the supposed sender—such as unusual phrasing, grammatical errors, or a different level of formality—can indicate account compromise or impersonation.
- Pressure from executives outside normal channels. Requests that appear to come from senior leadership but are sent via email instead of established communication methods, or at unusual times, may signal executive impersonation.
- Replies redirected outside the organization. Instructions to respond to a different email address, external account, or personal inbox often indicate an attempt to move the conversation beyond corporate security monitoring.
- Repeated follow‑ups escalating urgency. If a recipient hesitates, attackers may send multiple follow‑up emails increasing the pressure to finalize fraudulent transactions quickly.
How should we respond to a successful business email compromise?
Response to a successful business email compromise (BEC) should focus on rapid containment, financial damage reduction, investigation, incident analysis, and long‑term prevention. Because BEC incidents often escalate quickly and involve real financial processes, a prompt, well‑coordinated response can significantly improve the chances of recovering funds while limiting operational, legal, and reputational impact.
If you work with an MSSP (managed security service provider) like Corsica Technologies, you should contact your provider immediately. Here at Corsica, our cybersecurity experts will manage your response with a “critical” urgency level, coordinating with your team as needed.
Here are the essential steps to take after a successful BEC attack.
- In the case of a financial attack, immediately contact the bank or financial institution. If funds were transferred, notify the bank right away and request a recall or freeze; timing is critical to improving recovery odds.
- Disable or secure the affected email account(s). Reset passwords, revoke active sessions, enforce MFA, and review mailbox rules to prevent continued attacker access.
- Preserve evidence. Retain emails, headers, logs, and transaction details to support investigations, insurance claims, and potential law‑enforcement involvement.
- Notify internal stakeholders. Alert finance, IT, legal, leadership, and security teams so response efforts are coordinated and consistent.
- Assess scope and impact. Determine whether data was exposed, additional accounts were accessed, or other transactions were affected.
- Report the incident externally. File reports with relevant authorities (such as the FBI’s IC3 in the U.S.), regulators, or industry bodies as required.
- Communicate with affected parties. Notify vendors, customers, or employees if their data or payments may have been involved, in line with legal and contractual obligations.
- Engage cyber insurance and legal counsel. Initiate insurance claims promptly and seek guidance on regulatory, contractual, and disclosure requirements.
- Conduct a root cause analysis. Identify how the compromise occurred—e.g. credential theft, spoofed domain, or process failure—and what controls failed.
- Strengthen controls and processes. Update verification procedures, improve email security, reinforce MFA, and retrain employees to reduce the risk of recurrence.
How can we prevent business email compromise attacks?
Preventing business email compromise (BEC) requires a layered approach to security that combines technical controls, process safeguards, and employee awareness. Because BEC attacks exploit human trust and business workflows rather than utilizing malware, effective prevention focuses on verifying identity, reducing account‑takeover risk, and ensuring financial and data‑related requests cannot be completed through email alone.
Here are the primary ways to prevent BEC attacks.
Prevention Method | How to Implement It | Benefits Provided |
Multi‑factor authentication (MFA) | Require MFA for email, VPNs, financial systems, and cloud collaboration tools | Makes it harder for attackers to access accounts even if credentials are stolen |
Employee security awareness training | Train employees to recognize BEC tactics such as urgency, secrecy, impersonation, unusual communication tone, and unusual sending time | Reduces the likelihood of users acting on fraudulent requests |
Out‑of‑band verification procedures | Require phone calls, Teams messages, in-app workflows, or secondary approval to confirm payment or data change requests | Stops fraudulent transactions that rely on email‑only communication |
Email authentication (SPF, DKIM, DMARC) | Configure domain email authentication and enforce DMARC policies | Prevents spoofed emails from appearing to come from trusted domains |
Role‑based access controls (RBAC) | Limit financial and account‑change permissions to necessary users only | Reduces potential damage if an account is compromised |
Segregation of duties | Separate responsibilities for request, approval, and execution of payments | Prevents a single compromised user from completing fraud |
Advanced email security filtering | Use modern email security tools that detect impersonation, anomalies, and risky language | Improves detection of BEC attempts that bypass basic spam filters |
Financial process controls | Define strict workflows for wire transfers, ACH changes, and vendor updates | Ensures high‑risk actions require validation beyond email |
Account activity monitoring | Monitor for unusual login locations, forwarding rules, or inbox behavior | Enables faster detection of compromised email accounts |
Incident response playbooks | Document steps for reporting, disabling accounts, and contacting banks or law enforcement | Limits damage and improves recovery time if BEC occurs |
Vendor verification policies | Independently confirm changes to vendor point of contact or banking information | Reduces risk of invoice and supplier fraud |
Cyber insurance alignment | Align controls with cyber insurance requirements and coverage conditions | Improves claim eligibility and financial recovery after incidents |
The takeaway: Protect your organization from BEC
While BEC attacks can be devastating, they are preventable. The right approach combines technical controls like MFA with robust cybersecurity training for employees. If you need help preventing BEC attacks, contact us today. The Corsica Technologies team has helped 1,000+ companies on their technology journeys. Let’s take your next step in preventing BEC attacks.
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Ross Filipek is Corsica Technologies’ CISO. He has more than 20 years’ experience in the
managed cyber security services industry as both an engineer and a consultant. In addition to leading Corsica’s efforts to manage cyber risk, he provides vCISO consulting services for many of Corsica’s clients. Ross has achieved recognition as a Cisco Certified Internetwork Expert (CCIE #18994; Security track) and an ISC2 Certified Information Systems Security Professional (CISSP). He has also earned an MBA degree from the University of Notre Dame.
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