MAL-2026-12853 Malicious code in bigops-utils (npm)

Loading the package's main entry point auto-invokes helpers.js init(), which downloads an OS-specific binary from obfuscated Cloudflare Workers subdomains (hostnames assembled at runtime from split-string arrays such as MIRRORS=['oob-worker.cf102-baf.w','orke','rs.','de','v'].join('')) with a DNS-TXT chunked fallback that reassembles base64 chunks from TXT records under *.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under deceptive names ('.cache<rand>', 'dotnet_diag<rand>.exe'), chmod'd 0755, and detached-spawned via spawn('/bin/sh', ['-c', fp+' &'], {detached:true}) or cmd.exe /c start /b. No hash or signature verification is performed and the destinations are not tied to any advertised publisher. Sibling lib/telemetry.js uses dynamic API construction (require('child_'+'process'), fs['chmod'+'Sync']) to further evade static analysis. The behavior is framed as 'analytics/telemetry' but is an import-time remote-code dropper.

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.