MAL-2026-12149 Malicious code in bigops-auth (npm)

On require, index.js loads compat.js, which reconstructs Cloudflare Workers hostnames (oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev) and DNS-TXT resolver domains under dl.wel1.ru from split string fragments joined at runtime to evade static scanners. It fetches a platform-specific executable via https.get, writes it to /var/tmp/.cache<rnd> on Unix or %TEMP%\dotnet_diag_<rnd>.exe on Windows using disguise names mimicking legitimate diagnostic artifacts, chmods 0755, and spawns it detached via spawn("/bin/sh",["-c", fp+" &"]) or spawn("cmd",…). Environment gates on DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK and a mtime-based cooldown suppress repeat execution. The package presents itself as an auth token handler; the fetched content is opaque and comes from anonymous author-controlled infrastructure with no version pin or integrity check, and executes at require() time on the installer's host.

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.