Model-as-a-Trojan: Self-Activating Covert DNS Exfiltration Baked Into the Weights of an LLM Agent

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arXiv:2610.22578v1 Announce Type: new Abstract: Open-weight models are downloaded from public hubs and run inside agent harnesses that grant them tools, most powerfully, a shell, under the assumption that a sandbox contains whatever the model might do. This paper demonstrates that the assumption has a blind spot: the weights themselves can be the malware, and the sandbox's last open door, DNS, is enough. We fine-tune an open-weight LLM so that a single covert behavior lives in its parameters: o