MAL-2026-12831 Malicious code in bigops-alerts-widget (npm)

On require() of bigops-alerts-widget, vendor.js selects a payload path based on process.platform and process.arch, downloads an opaque binary from one of several anonymous Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev), writes it to /tmp or %TEMP% under disguised filenames (.cache<hex>, dotnet_diag_<hex>.exe), chmods it 0755, and spawns it detached via spawn('/bin/sh') or spawn('cmd'). Destination hostnames are assembled from split character arrays via Array.join to avoid appearing as plain strings. If the primary fetch fails, a fallback path issues multiple DNS TXT queries against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, concatenates the returned records, and base64-decodes them into an executable buffer that is then run the same way. Import-time execution of an attacker-controlled binary from anonymous infrastructure, combined with string-obfuscation of the destinations and a DNS-TXT covert channel, gives whoever published this package remote code execution 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.