MAL-2026-14207 Malicious code in @sarex-team/viewer (npm)

The package runs a DNS-based beacon that leaks the installer's OS username, hostname, and current-working-directory basename to the hardcoded attacker-controlled domain oob.sl4x0.xyz. lib/core.js collects os.userInfo().username, os.hostname(), and process.cwd(), joins them as subdomain labels under oob.sl4x0.xyz, and issues a dns.resolve4() lookup so the encoded values are exfiltrated via DNS. The destination domain and the module/API names ('os', 'dns', 'process', 'userInfo', 'hostname', 'cwd', 'resolve4') are reconstructed from numeric char-code arrays in lib/b02e30.js and lib/6ad264.js solely to conceal them. Execution is zero-interaction: package.json declares scripts.install: 'node index.js', and index.js top-level requires./lib/core inside a try/catch that swallows errors, so the beacon fires on npm install and again on every require() of the package while the install appears clean.