Malicious code in sme-rko-finance-front-payment-registers-operations-domain (npm)

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Source: amazon-inspector (5b21f700cd5e3a5eb33a34fa9e3a9754e73e5794ee1cc57ada01344004a8c921)

index.js unconditionally loads runtime.js on require. runtime.js detects the host OS and architecture, then downloads an opaque platform-matched binary over HTTPS from hardcoded Cloudflare workers.dev subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev). If HTTPS retrieval fails, it falls back to a DNS-TXT covert channel under *.dl.wel1.ru, requesting a chunk-count TXT record at c. and then reassembling base64-encoded payload chunks from N. TXT queries. The reassembled bytes are written to /var/tmp or %TEMP% under a disguised filename (.cache or dotnet_diag.exe mimicking a.NET diagnostic tool), chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. Both the CDN hostnames and the fallback resolver domains are constructed by Array.join of split fragments to evade string scanning. The delivered binary is unpinned, unverified, opaque, and served from anonymous edge-worker infrastructure and a.ru DNS channel unrelated to any legitimate publisher of a finance/payment-registers package.