
easy-day-js / EASY_DAY_JS_MASTRA_2026: Typosquatted Dependency Delivers Cross-Platform RAT to 144 npm Packages
A typosquatted npm dependency called easy-day-js — an exact metadata clone of the legitimate dayjs library — was injected across 144 @mastra packages in an 88-minute automated publishing window, reaching over 1.1 million weekly downloads. The second-stage payload is a cross-platform RAT that installs OS-level persistence on Windows, macOS, and Linux and targets LLM API keys, cloud credentials, and 166 cryptocurrency wallet extensions. No CVE was assigned; every CVE-based scanner was blind during active exploitation.





