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AgentHopper is a proof-of-concept AI virus that demonstrates how prompt injection vulnerabilities can propagate across multiple AI coding agents. The research exploited now-patched vulnerabilities in GitHub Copilot, Amazon Q, AWS Kiro, and Amp Code to create a self-replicating payload that spreads through Git repositories. The virus uses conditional prompt injection to target different agents with specific exploits, automatically infecting repositories and pushing malicious code to GitHub. Key mitigations include using SSH key passphrases, enabling branch protection, applying least privilege principles, and leveraging sandbox capabilities.

AgentHopper: An AI Virus Research Project · Embrace The Red

AgentHopper - An AI Virus Research Project

The Vulnerabilities and the Proof-of-concept

The Infection Model: How AgentHopper Spreads

Agents That Can Modify Their Own Configuration

Mitigations & Recommendations For Developers!