# Microsoft researchers demonstrate hidden backdoor technique for AI agents > Source: > Published: 2026-11-11 10:55:54+00:00 Microsoft researchers have demonstrated how small changes to an AI model can implant a hidden backdoor, causing an agent to execute an attacker’s command when a specific trigger appears. The technique, called Lazarus, requires no model retraining and allows the agent to behave normally during standard safety evaluations. The company has not observed threat actors weaponizing the technique, but says the research highlights a security concern for organizations that give AI agents access to terminals, … [More](https://www.helpnetsecurity.com/2026/11/11/microsoft-hidden-ai-backdoors-lazarus/) The post [Microsoft researchers demonstrate hidden backdoor technique for AI agents](https://www.helpnetsecurity.com/2026/11/11/microsoft-hidden-ai-backdoors-lazarus/) appeared first on [Help Net Security](https://www.helpnetsecurity.com).