Business email compromise can begin with a message that looks like a normal invoice, payment request, or instruction from a company executive. The sender may appear familiar, the request may match an existing business relationship, and the message may contain no malicious attachment. This can make the fraud difficult to identify before someone responds or takes the requested action.
A successful business email compromise can lead to unauthorized payments, exposed information, or further attacks sent from a trusted account. Understanding how these attacks work helps businesses combine employee awareness with the technical controls needed to reduce the risk.
What Is Business Email Compromise?
Business email compromise is a targeted form of email fraud in which an attacker impersonates a trusted person or gains access to a legitimate email account. The attacker then uses that identity to persuade an employee, customer, or business partner to transfer money, disclose sensitive information, or provide further account access.
A BEC attack can involve a company executive, supplier, finance employee, attorney, or another person whose requests are normally trusted. Some attacks use a lookalike email address or misleading display name. Others begin when a real account is compromised through credential theft or a deceptive sign-in page.
BEC can overlap with email spoofing and phishing, but the terms are not identical. Phishing is often used to steal credentials or deliver malicious content, while BEC is usually a targeted attempt to misuse a trusted business identity for fraud or data theft.
How Does a BEC Attack Work?
Attackers often research an organization before sending a message. Company websites, social media profiles, and previous data breaches can reveal employee names, job responsibilities, suppliers, and reporting relationships. This information helps the attacker create a request that fits normal business activity.
If an email account has already been compromised, the attacker may monitor conversations until a suitable opportunity appears. They may also create forwarding or inbox rules to collect messages or hide their activity. The attacker can then enter an existing conversation, change payment details, or send new requests from the trusted account.
The message will often create urgency or discourage normal verification. An employee may be told that a payment is confidential, that an executive cannot be contacted, or that new bank details must be used immediately. The objective is to make the recipient act before confirming the request through another channel.
Common BEC Scam Examples
BEC scams can take several forms, including:
- Executive impersonation: An attacker pretends to be a director or senior manager and asks an employee to arrange an urgent payment, purchase gift cards, or provide confidential information.
- Supplier invoice fraud: A genuine supplier or customer account is compromised, allowing the attacker to send altered payment instructions within an existing email conversation.
- Payroll diversion: An attacker impersonates an employee and asks the payroll team to send future salary payments to a different bank account.
- Account takeover: A compromised account is used to contact colleagues, customers, or suppliers and direct them to fraudulent links, invoices, or payment details.
- Sensitive data requests: An attacker impersonates an authorized person and asks for employee records, tax information, account details, or other protected data.
These BEC scam examples show why checking the sender’s display name alone is not enough. A message can come from a lookalike address or from a real account that an attacker controls.
How to Prevent Business Email Compromise
No individual product or policy can prevent every business email compromise. Effective protection combines authentication, access controls, monitoring, email security, employee training, and clear verification procedures.
Enable Multi-Factor Authentication
Multi-factor authentication adds another requirement beyond a password when a user signs in. This reduces the risk created by stolen or reused credentials and should be applied to business email accounts wherever possible.
MFA must still be configured and managed correctly. Some phishing methods can capture authentication codes or active sessions, so MFA should be combined with account monitoring and access policies. ProTek’s guide explains the general process for multi-factor authentication for Microsoft Office 365.
Monitor Email Accounts for Suspicious Activity
Monitoring can identify warning signs that a password alone will not reveal. These signs may include unusual sign-in locations, unexpected forwarding rules, mass email activity, or changes to account security settings.
Managed detection and response can provide continuous monitoring and support a faster response when suspicious activity is identified. ProTek can combine monitoring with managed email security to help businesses review alerts, contain affected accounts, and address email-based threats.
Review Direct Send in Microsoft 365
Microsoft 365 Direct Send allows devices and applications to send messages to recipients within an organization without using a licensed mailbox. It may be used by office equipment or business systems, including multifunction printers and scanners.
If Direct Send is not required or properly controlled, it can create an opportunity for messages that appear to come from the organization’s domain to reach internal recipients. Exchange Online provides a Reject Direct Send control, but it should not be enabled without first checking whether legitimate systems depend on the feature. Existing devices, applications, and mail connectors should be reviewed before the setting is changed.
Apply Conditional Access Policies
Conditional Access can evaluate factors such as the user, device, location, and sign-in risk before allowing access. Depending on the available Microsoft licensing and the organization’s requirements, policies can be used to restrict access from unmanaged devices, block unsuitable locations, or require stronger authentication for higher-risk activity.
These policies follow a Zero Trust approach in which a password and authentication prompt are not automatically treated as sufficient proof for every sign-in.
Train Employees and Verify Sensitive Requests
Technical controls cannot evaluate every business conversation or payment decision. Employees should receive regular cybersecurity awareness training covering impersonation, unusual payment instructions, suspicious sign-in pages, and the correct way to report a questionable message.
Businesses should also establish verification procedures for financial and sensitive requests. Changes to bank details, payroll information, or payment instructions should be confirmed using a known telephone number or another trusted communication channel. High-value payments may require approval from more than one person.
What Should You Do After an Email Account Compromise?
If a business suspects that an email account has been compromised, it should respond promptly and avoid using the affected account to coordinate the response. Appropriate steps may include:
- Notify the internal IT team or managed service provider using a trusted communication method.
- Reset the affected credentials, revoke active sessions, and review registered authentication methods.
- Check inbox rules, forwarding settings, sent messages, and deleted items for unauthorized activity.
- Identify employees, customers, or suppliers who may have received fraudulent messages.
- Contact the bank immediately if a payment or bank-detail change may have been involved.
- Preserve relevant messages and logs for the investigation and any required reporting.
The exact response will depend on the email platform, the accounts involved, and whether money or protected information was exposed.
Strengthen Your Protection Against Business Email Compromise
Business email compromise targets both technology and normal working relationships. Reducing the risk requires more than relying on employees to recognize every convincing message. Authentication, monitoring, email filtering, access policies, training, and payment verification should operate together.
ProTek IT Solutions provides managed IT security services for businesses that need help reviewing their email environment and implementing appropriate security controls. Contact ProTek to discuss your current email protection and the measures available for reducing BEC risk.
Frequently Asked Questions
What is the difference between BEC and phishing?
Phishing is commonly used to steal credentials, distribute malicious files, or direct users to fraudulent websites. Business email compromise is a more targeted form of fraud that misuses a trusted identity to request money, information, or another sensitive action. A phishing message may be the first step in compromising the account later used for BEC.
Can MFA prevent every BEC attack?
No. MFA provides an important additional barrier, but it does not prevent every form of impersonation, social engineering, or session theft. It should be combined with Conditional Access, account monitoring, email security, and verification procedures.
How can employees identify a possible BEC scam?
Warning signs can include unexpected urgency, confidential payment requests, changed bank details, unusual sign-in links, slightly altered email addresses, and instructions not to contact the apparent sender. Employees should verify sensitive requests through a separate, trusted channel.