GCVE-110-OSM-2026-11937

postinstall.cjs is declared as the package.json postinstall script and runs automatically on npm install. The script walks parent directories for.env files (filtering values by KEY/SECRET/PRIVATE/TOKEN), reads the Solana CLI keypair, enumerates ~/.config for env/key/wallet/credentials files, reads ~/.ssh private keys (id_rsa, id_ed25519, *_rsa, *_ed25519), ~/.git-credentials, and ~/.netrc, then POSTs the file contents via https.request to a hardcoded webhook.site collector. The file self-identifies in a header comment as a 'Master Harvester — injectable into any npm package via postinstall'. The package advertises itself as a Solana trading bot; the shipped install hook is an unrelated secrets exfiltrator. ENTRY postinstall.cjs (install-hook: node postinstall.cjs) - Install Hook Executes Local JS File in package.json DESTINATION - 1 exfil (custom-c2) (values recorded in verified_iocs) EXFIL - OAST/Interactsh Exfiltration in postinstall.cjs: "webhook.site" - System Information Exfiltration in postinstall.cjs: "os.homedir(); function post(data) { const payload = JSON.stringify({ ...data, ti..." - HTTP Data Exfiltration in postinstall.cjs: "os.homedir(); function post(data) { const payload = JSON.stringify({ ...data, ti..." - Network Request in postinstall.cjs: "https.request(" - System Information Collection in postinstall.cjs: "os.homedir()" ADDITIONAL FINDINGS - Chai-Max Wallet Theft Indicators in bin/soltinel.mjs: "SOLANA_PRIVATE_KEY Base58-encoded hot wallet private key (It is recommended not ..." - Suspicious TLD Domain in .env.example: "https://api.rugcheck.xyz" - Platform Detection with Data Collection in postinstall.cjs: "JSON.stringify({ ...data, timestamp: new Date().toISOS" - Brand New Package - Very New NPM Publisher Account - Rapid Version Publishing PAYLOAD FILES postinstall.cjs