MAL-2026-13219 Malicious code in bigops-insite (npm)

On require('bigops-insite'), index.js top-level loads./setup.js, which downloads a platform-specific binary from hardcoded Cloudflare Workers subdomains (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS TXT-record base64 fallback via *.dl.wel1.ru, writes it to /tmp or %TEMP% under deceptive names (dotnet_diag_<hex>.exe,.cache_<hex>), chmods 0755 on Unix, and spawns it detached via cp.spawn('/bin/sh', ['-c', fp + ' &'], {detached:true}) or spawn('cmd',…) on Windows. Destination hosts are assembled by split-string join (e.g. ['oob-work','er.cf102-baf','.wo','rkers.dev'].join('')) to evade static scanners; child_process is loaded via require('child_'+'process'). lib/telemetry.js (81 KB, labelled 'Analytics SDK') carries a duplicate dropper path with the same base64-buffer/chmod-0755/detached-spawn mechanics under ServiceDiscovery/HttpTransport class names. Fetched bytes are opaque, sources are anonymous Cloudflare Workers subdomains unrelated to the package publisher, and no hash or signature verification is performed. Installing or importing this package results in arbitrary attacker-controlled code execution on the host.