# Lazare, veni foras: Reprogramming Dormant Neurons to Backdoor AI Agents

Source: [Microsoft Research](https://www.microsoft.com/en-us/research/blog/lazare-veni-foras-reprogramming-dormant-neurons-to-backdoor-ai-agents/) · 2026-11-10 · AI
Page: https://themorning.dev/story/lazare-veni-foras-reprogramming-dormant-neurons-to-backdoor-ai-agents-1d554c42ba6f2a43
Kind: research · Impact: medium

## In brief

- Microsoft Research published threat research on "Lazarus", a backdoor technique that reprograms dormant neurons in AI models.
- According to the sources, editing fewer than 10 neurons can turn a capable agent model into a sleeper agent that carries a short payload.
- The sleeper agent passes all evaluations and only misbehaves when a trigger string appears in its context.

## Why it matters

A backdoored model can behave normally in standard testing and still execute malicious commands once a hidden trigger appears, which the sources describe as especially serious for AI agents with tools.

## Timeline

- 2026-11-10: Microsoft Research publishes Lazarus backdoor research

## Coverage

- [Detecting sleeper agents hiding in AI model neurons](https://www.microsoft.com/en-us/security/blog/2026/11/10/detecting-sleeper-agents-hiding-in-ai-model-neurons/) — Microsoft Security Blog, 2026-11-10
- [Lazare, veni foras: Reprogramming Dormant Neurons to Backdoor AI Agents](https://www.microsoft.com/en-us/research/blog/lazare-veni-foras-reprogramming-dormant-neurons-to-backdoor-ai-agents/) — Microsoft Research, 2026-11-10

Tags: ai-security, backdoors, ai-agents, model-integrity, research

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