GCVE-110-OSM-2026-12675

package.json declares a postinstall hook that runs index.js on npm install. index.js reads Minecraft launcher credential stores (launcher_accounts.json, launcher_profiles.json, and equivalent files for Prism, MultiMC, TLauncher, Modrinth, PolyMC, GDLauncher), extracting Mojang/Microsoft accessTokens, refreshTokens, and clientTokens. It also recursively walks the.minecraft directory reading.json/.txt/.cfg/.properties/.yml/.log files and matches their contents against JWT and Bearer-token regexes. The collected credentials are combined with os.hostname(), os.userInfo().username, and os.platform() and POSTed via HTTPS to a hardcoded Discord webhook (discord.com/api/webhooks/1554065488726990909/...). No functionality matching the package name is present; the sole effect of installing the package is credential theft against the installer. ENTRY index.js (install-hook: node index.js) - Install Hook Executes Local JS File in package.json DESTINATION - 1 exfil (discord-webhook) (values recorded in verified_iocs) EXFIL - Webhook Data Exfiltration in index.js: "discord.com/api/webhooks/1554065488726990909/TBdTnJ7WNkFZySIT2n2cnX1U95QTXM3vsnM..." - Network Request in index.js: "https.request(" - System Information Collection in index.js: "os.userInfo()" ADDITIONAL FINDINGS - Brand New Package - Very New NPM Publisher Account PAYLOAD FILES index.js