MAL-2026-13250 Malicious code in bigops-statements-timeline (npm)

On require() of the package, index.js loads support.js which selects a platform-specific asset path and downloads a binary over HTTPS from a rotating list of anonymous Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS TXT chunked-base64 fallback under *.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under disguised names (analytics_state, dotnet_diag*), chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe /c start /b. Destination hostnames and fallback DNS domains are reconstructed at runtime from split string fragments joined via Array.join to defeat static analysis. Installing or requiring this package results in execution of arbitrary attacker-controlled native code 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.