Jun 27, 2024 Information hub

Vendor Impersonation Threat in IT Security

What is Vendor Impersonation attack?

Vendor impersonation is a type of fraud where attackers pose as a legitimate vendor or supplier to deceive an organization. The goal of this deception is often to manipulate the organization into making unauthorized changes. This can be achieved through tactics such as phishing emails, spoofed communication channels, or other social engineering techniques. By impersonating a trusted vendor, attackers exploit the trust and established procedures between the organization and the vendor, leading to potential financial loss, data breaches, or other security compromises.

The Introduction of the IT System in Supply Chain

In the corporate world, managing relationships with many vendors can be complex. To simplify this, organizations often use advanced IT systems for vendor management. These systems consolidate vendor information, handle payments, and maintain communication channels, giving procurement teams a centralized control point. TesBerry (A hypothetical Organization), a major company, recently adopted such a system to manage their extensive vendor network, which includes long-time partners like Hardware supplier.

This IT system promised several benefits. It was designed to improve efficiency, ensure payments were made on time, and reduce administrative work. By using this system, TesBerry could easily keep track of their vendor relationships and financial transactions in real-time. However, like any IT technology, it was vulnerable to different cyber attacks. (Tesberry already had IT security and safety controls in place)

Phase 1: The Phishing Attack Unfolds

One day, TesBerry’s procurement team received an email that looked like it came from their trusted partner, Hardware supplier. The email, using Hardware supplier’s official email domain, requested a change to the contact details in TesBerry’s vendor management system. It claimed there had been an internal reorganization at Hardware supplier, so all future communications should go to a new email address.

Because TesBerry had a long-standing good relationship with Hardware supplier, they didn’t doubt the email’s authenticity and made the requested changes without verifying them thoroughly. The new email address provided in the email was actually controlled by cybercriminals. Once they gained access, the attackers quickly reset Hardware supplier’s account password in TesBerry’s system. This gave them access to change the bank account details linked to Hardware supplier.

The cybercriminals redirected payments meant for Hardware supplier to their own account. Over several months, TesBerry continued making payments unaware that the money was being stolen. Because of their trust in Hardware supplier, the delayed payments initially didn’t raise alarms.

Phase 2: Discovery and Realization

Months later, Hardware supplier noticed a significant gap in their cash flow, which started affecting their operations. They reached out to TesBerry about the overdue payments. Initially, both companies thought it might be a simple accounting mistake. However, when TesBerry assured Hardware supplier that all payments had been made, they realized something was wrong.

They launched a joint investigation and quickly uncovered the truth. The email requesting the contact details change was fake—a clever phishing attack that exploited trust and procedural gaps. By changing the contact details, the cybercriminals intercepted payments, causing substantial financial losses to both TesBerry and Hardware supplier.

This breach highlighted how even sophisticated IT systems can be vulnerable to human error and procedural weaknesses. The phishing attack bypassed technical safeguards by manipulating trust and exploiting the lack of thorough verification processes.

How Securityium Could Have Prevented This Attack

At Securityium, we specialize in protecting organizations from sophisticated phishing attacks like the one that targeted TesBerry. Here’s how our services could have prevented this breach:

  • Phishing Simulation and Security Awareness Training: Securityium offers phishing simulation services and extensive training programs to raise awareness about phishing tactics. By training TesBerry’s procurement team to recognize suspicious emails and report them, we could have improved their ability to identify phishing attempts. Ongoing training ensures that employees stay vigilant against evolving threats.
  • Enhanced Security Policies and Procedures: Implementing strict security policies recommended by Securityium, such as robust verification processes for changes to vendor details, could have prevented unauthorized modifications. Our guidelines include mandatory callbacks and multi-level approvals for critical information changes.
  • Security Compliance and Best Practices: Adhering to industry standards and best practices recommended by Securityium ensures organizations like TesBerry are well-protected against cyber threats. Compliance with cybersecurity regulations helps safeguard sensitive information and avoids legal consequences.
  • Additionally, Comprehensive Vulnerability Assessment: Regular assessments and penetration testing by Securityium could have identified weaknesses in TesBerry’s vendor management system and security protocols. Our experts use advanced tools to simulate different attack scenarios, pinpointing vulnerabilities before attackers can exploit them. This would have highlighted the need for stronger verification processes and multi-factor authentication.



The phishing attack on TesBerry and Hardware supplier highlights the urgent need for robust cybersecurity measures. This breach, caused by a sophisticated phishing email, demonstrates how human errors, lack of security awareness and procedural weaknesses can compromise even the most secure IT systems. Securityium is committed to providing comprehensive security solutions, including vulnerability assessments, penetration testing, and continuous monitoring, to help businesses protect their IT systems.

By partnering with Securityium, TesBerry could have prevented this breach through regular testing, improved awareness, and stronger security policies. Our proactive approach ensures that our clients are well-prepared to defend against potential threats.


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