Claude Code helped reveal a hidden malware trigger in an AI model
Microsoft researchers used Claude Code running Opus 4.5 to uncover the Lazarus backdoor technique, which can turn an otherwise capable AI model into a sleeper agent by changing fewer than 10 dormant neurons. The model can still pass standard evaluations and behave normally during routine tasks, and Microsoft said the finding exposes a gap for organizations that give AI agents access to terminals, files, and credentials. How Lazarus hides in…