LWA-2026-10335 MAL-2026-13253 ↗ confirmed malware

bigops-storio-ngrx@35.2.2

Malicious code in bigops-storio-ngrx (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information Discovery

Analysis

On require(), the package loads a bundled dropper (_ext.js) that downloads a platform-specific binary payload over HTTPS from Cloudflare Workers endpoints (oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If HTTPS fails it falls back to a DNS-TXT channel: it resolves c[.]sdk[.]dl[.]wel1[.]ru to learn a chunk count, then fetches base64 chunks from N[.]sdk[.]dl[.]wel1[.]ru and reassembles the payload. The downloaded binary is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under %TEMP% on Windows), made executable, and launched as a detached background process via /bin/sh -c "<path> &" or cmd.exe /c start /b. The package otherwise contains no functional library code.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 02:23 PM
analyzed
Aug 5, 2026, 03:42 PM

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Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.