LWA-2026-10677 MAL-2026-13547 ↗ confirmed malware

devplatform-spa-plugin-remote-module@35.9.6

Malicious code in devplatform-spa-plugin-remote-module (npm)

T1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1059 · Command and Scripting Interpreter

Analysis

On require(), the package loads a bundled support module that downloads a platform-specific second-stage binary and executes it. It fetches the binary over HTTPS from three Cloudflare Workers hosts (oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe depending on OS/arch. If the HTTP download fails it reconstructs the payload from DNS TXT records under c[.]sdk[.]dl[.]wel1[.]ru (fallback domains sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The downloaded binary is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the temp dir on Windows), made executable, and launched as a detached background process (cmd.exe /c start /b on Windows, /bin/sh -c "<path> &" on Unix). A filesystem timestamp stamp (/tmp/.analytics_state) limits re-execution.

analyzed by
Leitwacht
first seen
Aug 7, 2026, 06:56 AM
analyzed
Aug 7, 2026, 06:57 AM

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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.