Trojanized AI skills gain 1.7M installs in agent-targeted attack

Attackers uploaded malicious AI agent skills (instruction files that tell AI systems how to perform tasks) to a marketplace called skills.sh, disguising them as legitimate tools from Paperclip and Browser Use. The trojanized skills instructed AI agents to download credential stealers (malware that steals sensitive information like passwords and cloud credentials) from fake GitHub repositories, reaching 1.7 million downloads before discovery by Zenity researchers.