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Hidden prompt turns Microsoft Copilot into an AI worm

medmalwarebytes_blogPublished 2026-07-30

<p class="wp-block-paragraph">A <a href="https://enklypesalt.com/posts/context-collapse-part3-ai-worming-through-word/" rel="noreferrer noopener nofollow" target="_blank">security researcher has demonstrated</a> how Microsoft Copilot for Word can be tricked into spreading a self‑propagating prompt‑injection “AI worm.” The attack silently alters documents and embeds its own hidden instructions int

Indicators of compromise

Original source: https://www.malwarebytes.com/blog/ai/2026/07/hidden-microsoft-copilot-ai-worm

Same event, other sources