Case Study: Large Debt Collector Company prevents nearly $30,000 invoice fraud with Abnormal AI

Large Debt Collector Company - Customer Case Study

Large Debt Collector Company faced a sophisticated invoice-fraud campaign in which attackers used a lookalike domain and spoofed the company’s COO to pressure accounts payable into paying a fake $30,000 invoice. The attack involved multiple back-and-forth messages and a malicious “reply-to” that routed employee responses to the adversary, creating urgency and social proof that nearly led to a large fraudulent payment. To defend against this, the customer engaged Abnormal AI and its Abnormal Behavior Technology (ABX) cloud email security platform.

Abnormal AI applied identity modeling, a relationship graph, and content analysis to identify the domain impersonation, unsafe engagement patterns, and the spoofed reply-to, detecting the campaign during a passive evaluation of email flow. Abnormal AI’s platform stopped the fraudulent transaction and prevented the loss—avoiding nearly $30,000 in theft—and disrupted the attacker’s multi-message operation, demonstrating measurable protection of the company’s finance processes.