LWA-2026-10258 MAL-2026-12751 ↗ confirmed malware

devplatform-select-fields@35.2.6

Malicious code in devplatform-select-fields (npm)

T1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1568 · Dynamic ResolutionT1059 · Command and Scripting Interpreter

Analysis

On require, the package's _shim.js downloads a platform-specific second-stage binary over HTTPS from Cloudflare Workers endpoints (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe), with a DNS-TXT fallback channel via c[.]sdk[.]dl[.]wel1[.]ru. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the Windows temp dir) and executed detached (cmd.exe /c start /b on Windows, /bin/sh -c '<file> &' on POSIX).

analyzed by
Leitwacht
first seen
Aug 5, 2026, 01:41 PM
analyzed
Aug 5, 2026, 02:46 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.