MAL-2026-5712 Malicious code in jextic-eclib (npm)

On npm install, the package's postinstall hook (postinstall.js) requires index.js, whose top-level scanAndExfiltrate() call walks the installer's working directory and parent directories for sensitive files (.env,.aws/credentials,.ssh/id_rsa,.npmrc,.netrc,.git-credentials, service-account.json, and similar) and POSTs their contents via execSync('curl...') to a hardcoded Discord webhook. The webhook URL is split into two base64-encoded chunks (aHR0cHM6Ly9kaXNjb3JkLmNvbS9hcGkvd2ViaG9va3Mv plus a base64-encoded webhook ID/token) and reassembled at runtime to evade simple string scanners. The combination of installer-secret enumeration, hardcoded attacker-controlled exfil endpoint, base64 obfuscation, and unconditional execution under the postinstall lifecycle hook is a textbook supply-chain credential-theft attack.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.