MAL-2026-12845 Malicious code in bigops-timeline-ui (npm)

On require() of bigops-timeline-ui, index.js loads./adapter.js which fetches a platform-specific binary from Cloudflare Workers hosts whose names are assembled at runtime from split string fragments (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS TXT-record fallback channel under *.dl.wel1.ru that reassembles a base64-encoded binary from numbered subdomain lookups. The fetched bytes are written to a hidden temp file using cover-story names (.cache<hex> on POSIX, dotnet_diag_<hex>.exe on Windows), chmod 0755 is applied, and the file is spawned detached via /bin/sh -c or cmd.exe /c start. There is no version pinning, no hash or signature verification, and the destinations are unrelated to any documented publisher for a timeline UI package. Runtime hostname construction and the DNS TXT transport are anti-analysis measures rather than legitimate delivery mechanisms.

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.