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Crook used three open source agents to break into a Fortune 500 hospitality company, a major US airline and 25+ other orgs
TL;DR
A sophisticated cyberattack campaign leveraged autonomous AI agents to breach dozens of companies with minimal human intervention and extremely low operational costs. The attack resulted in massive credit card data theft and the deployment of web skimmers across multiple retail platforms.
A recent investigation by security firm Gambit has uncovered a highly efficient cyberattack campaign orchestrated by a Chinese-speaking operator using open-source AI harnesses. The attacker utilized three distinct AI tools—Hermes, Strix, and Cairn—to automate the entire lifecycle of an intrusion, from initial vulnerability discovery to exploitation and data exfiltration. Hermes acted as the central orchestrator, managing workflows and executing multi-step tasks based on human prompts. Strix was employed for deep-mode penetration testing to identify exploitable vulnerabilities, while Cairn took over once targets were identified to execute specific objectives such as deploying web shells or gaining administrative access. The operational efficiency of this campaign was unprecedented; the attacker achieved a mean cost of approximately $25 per scan by utilizing OpenRouter to access various large language models including Claude Opus and DeepSeek. The impact of the campaign was significant, with at least 27 companies compromised, including a Fortune 500 hospitality firm and a major US airline. The breach led to the theft of over 600,000 credit card records and the successful injection of JavaScript-based skimmers into the checkout pages of numerous online retailers. This shift toward autonomous, high-tempo attacks presents a new challenge for cybersecurity professionals, as the time between vulnerability exposure and exploitation has been reduced to mere hours, making traditional patching cycles insufficient for defense.