Vendor Fraud: Meaning, Examples & Prevention

Vendor fraud happens when fraudsters manipulate procurement or payment processes to divert business funds through fake invoices, impersonation, or wire fraud. As this is becoming a growing concern for businesses, understanding how these frauds work can help in protecting the company.

The Association of Certified Fraud Examiners (ACFE) reports that billing fraud causes a median loss of approximately $100,000 per case. Hence, by understanding how these scams work and strengthening payment controls, businesses can reduce their exposure to these risks.

What is Vendor Fraud?

Vendor fraud happens when an organization’s purchasing or payment process is exploited to divert money through deceptive invoices or unauthorized transactions. While external suppliers are generally responsible, vendor fraud can also involve employees who approve or ignore fraudulent payments in return for personal gain.

Fraudsters now use AI-generated invoices, convincing impersonation tactics, and social engineering methods to make wire fraud attempts look genuine. This makes them much more difficult to spot through routine checks alone.

Why Vendor Fraud Scams Succeed?

• Urgency and Social Engineering: Fraudsters create a sense of urgency, encouraging finance teams to approve payments quickly before completing the usual verification checks.
• Weak Internal Controls: If the same person can add vendors, approve invoices, and release payments, fraudulent transactions become much easier to carry out without detection. Excessive access rights can also allow unauthorized changes to vendor or bank account details.
• Manual Processes and Legacy Systems: Paper-based workflows, spreadsheets, and older software make it harder to spot wire fraud and vendor fraud attempts before transferring money.
• Poor Vendor Verification: Rushing through vendor onboarding or failing to review supplier information periodically can leave businesses exposed to fake vendors and fraudulent payment requests.
• Lack of Regular Monitoring: If invoices, vendor records, and payment activity are not checked regularly, suspicious payments can go unnoticed for a long period.

Understanding these tactics can help finance teams identify vendor fraud before a fraudulent payment is approved.

Types of Vendor Fraud

Here are the different types of vendor fraud with vendor fraud examples:

Vendor Impersonation Fraud

• What It Is: Fraudsters impersonate a supplier or create a fictitious supplier or a company that closely resembles a legitimate vendor by compromising their email account. They may create a fake email address or use other communication channels, like video calls, to request payments or changes to payment details.
• Example: Scammers send a fake email asking the finance team to change the bank account details. The payment is then made without proper verification.
• Impact: Payments are transferred to the fraudster instead of the genuine vendor.
• Tip to Prevent: Verify all payment detail changes through a trusted, independent channel. Use tools like Diopter AI to help detect vendor impersonation attempts before fraudulent payment requests are approved.

Invoice Inflation

• What It Is: A vendor inflates invoice amounts or bills for goods or services that were never supplied.
• Example: A supplier increases the quantity of products on an invoice or charges for additional services that were never delivered.
• Impact: This can lead to overpayments, unnecessary financial losses, and inaccurate business expenses.
• Tip to Prevent: Match invoices with purchase orders and delivery records before approving or making payments.

Duplicate Invoicing

• What It Is: Fraudulent vendors submit the same invoice multiple times deliberately, hoping that the duplicate payments will go unnoticed.
• Example: A fraudulent vendor resends an invoice with a different number and both are paid.
• Impact: Can result in unnecessary payments, financial losses, and inaccurate accounts payable records.
• Tip to Prevent: Use automated invoice matching and duplicate invoice detection tools.

Employee Collusion and Kickbacks

• What It Is: Employees work with vendors secretly to manipulate decisions, approve invoices or award contracts in exchange for money or other personal benefits.
• Example: A procurement manager consistently awards contracts to one supplier after receiving undisclosed commissions or gifts.
• Impact: Businesses will have to pay more, may get lower-quality goods, and lose trust with customers.
• Tip to Prevent: Assign different procurement responsibilities to different employees, rotate their roles, and conduct regular audits.

Check Tampering

• What It Is: Scammers alter company checks, forge them or intercept them before reaching the correct vendor.
• Example: A fraudster changes the payee name on a company check and deposits it into an unauthorized account.
• Impact: The fraudster receives the funds and the legitimate vendor remains unpaid.
• Tip to Prevent: Use electronic payments where possible and restrict access to check and signing authority.

Vendor Fraud Case Studies

The following examples highlight how routine transactions can lead to significant financial losses through vendor fraud cases:

Case Study 1: Intel Israel

Intel Israel filed a lawsuit saying that a former employee worked with a supplier to commit fraud over $840,000. The employee reclassified hardware purchases as service payments. This allowed fake invoices to bypass verification checks.

• What Went Wrong: The employee exploited a gap in the approval process, where service payments required fewer verification steps. Since there was an involvement of an internal employee, it made the fraudulent transactions more difficult to detect.
• How It Could Have Been Prevented: Better approval workflows, segregation of duties, and consistent verification for all payment types could have flagged the suspicious transactions.
• Lesson For Businesses: Fraud doesn’t always come from outside the organization. Strong internal controls are just as important as external security measures.

Case Study 2: Baltimore City Fake Vendor Scam

Baltimore City lost $803,000 after fraudsters posed as a legitimate vendor representative. Over time, the scammer convinced city employees to change the vendor’s banking details and redirect payments.

• What Went Wrong: Vendor details were changed without verifying the request, allowing the fraudsters to divert payments before anyone realized what had happened.
• How It Could Have Been Prevented: Verifying vendor information through a trusted contact, multiple approvals for payment changes and monitoring vendor records could have helped.
• Lesson For Businesses: Even a simple request to update vendor payment details should be treated as high risk until it has been independently verified.

How to Identify Vendor Fraud

Check for these warning signs before processing vendor payments:

• Sudden changes in bank details, such as requests to update a vendor’s bank account or payment details.
• Sender’s email address does not match the vendor’s official domain.
• Requests to skip standard verification or approval processes.
• Duplicate or unusual invoices that may differ from normal billing patterns.
• Unexpected or urgent payment requests.

Vendor Fraud Prevention Strategies

The following vendor fraud prevention strategies can help reduce vendor fraud cases and strengthen payment security:

• Implement Vendor Management: Verify vendor identities, bank account details, tax information, and business registrations before adding them to your system. Review vendor records regularly to spot duplicate or suspicious accounts.
• Strengthen Internal Controls: Assign vendor onboarding, invoice approval, and payment processing responsibilities to different employees to reduce the risk. Also, conduct regular audits and employee training for enhanced protection.
• Verify Payments Through Invoice Matching: Businesses should use the following to ensure every payment request is genuine.
  • 2-way matching (invoice and purchase order)
  • 3-way matching (invoice, purchase order, and proof of delivery)
  • 4-way matching (adding an inspection report).
• Leverage Fraud Prevention Tools: Accounts Payable (AP) automation, approval workflows and duplicate invoice checks can help identify unusual transactions and reduce manual errors.
• Use AI-powered Fraud Detection: Modern solutions like Diopter AI can identify vendor impersonation attempts, analyze suspicious communications and flag potential fraud before payments are processed.

How Diopter AI Prevents Vendor Fraud Scams

Traditional fraud controls can verify invoices and approvals, but they may not detect advanced vendor impersonation fraud powered by AI and social engineering. Here are some of the ways Diopter AI adds an extra layer of protection for wire fraud:

• Real-Time Identity Verification: Confirms that the person requesting a payment or vendor change is who they claim to be.
• AI-Generated Media Detection: Continuously monitors live voice and video calls to identify deepfakes, voice cloning, and other AI-generated content.
• Social Engineering Tactics: Flags common manipulation techniques such as urgency, authority, and pressure that fraudsters use to bypass normal approval processes.
• Payment Instructions Validation: Checks vendor changes and payment requests against predefined policies before funds are transferred.
• Recommends the Next Step: Provides a clear risk verdict, such as approve or hold. This helps teams make informed decisions before processing high-value payments.

Final Words

As fraudsters rely on AI and social engineering for vendor fraud more, you have to incorporate more protection than regular checks. A proper layered approach with trained employees, strong approval processes, and real-time identity verification offers stronger protection.

Diopter AI adds that extra layer by detecting vendor impersonation and high-risk payment requests before they cause damage. Book a walkthrough to learn more.

Frequently Asked Questions