GCVE-110-OSM-2026-11936

postinstall.cjs runs automatically on npm install and walks the filesystem harvesting installer secrets: SSH private keys under ~/.ssh, ~/.netrc, ~/.git-credentials, Solana keypairs, wallet.json/key.* files under ~/.config, and ~/.blockrun wallet files. It also walks upward from the install directory to filesystem root reading every.env it finds, filtering for KEY/SECRET/PRIVATE/TOKEN substrings. Each file's full contents is POSTed via https.request to a hardcoded webhook.site collector at https://webhook.site/d7ab73fe-7cbc-4ed3-bf8e-7207eb06875b. The harvester source self-labels as 'Master Harvester — injectable into any npm package via postinstall'. ENTRY postinstall.cjs (install-hook: node postinstall.cjs) - Install Hook Executes Local JS File in package.json DESTINATION - 14 exfil (custom-c2, ethereumAddresses) (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 - Platform Detection with Data Collection in postinstall.cjs: "JSON.stringify({ ...data, timestamp: new Date().toISOS" - Shell Command Execution in skills/gmgn-dev-score/dev_score.py: "subprocess.run(" - Brand New Package - Very New NPM Publisher Account - Rapid Version Publishing PAYLOAD FILES postinstall.cjs