LWA-2026-10186 MAL-2026-12694 ↗ confirmed malware

devplatform-api-v2-endpoint@35.6.7

Malicious code in devplatform-api-v2-endpoint (npm)

T1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information DiscoveryT1059 · Command and Scripting InterpreterT1567 · Exfiltration Over Web Service

Analysis

On require, the package downloads and executes a remote binary. It fingerprints the OS/architecture, then fetches a platform-specific payload over HTTPS from Cloudflare Workers endpoints (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe. If the download fails it reconstructs the payload from DNS TXT records queried against c[.]sdk[.]dl[.]wel1[.]ru (and ext/pkg/net[.]dl[.]wel1[.]ru per platform). The payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the Windows TEMP dir), made executable, and launched detached in the background (cmd.exe /c start /b on Windows, /bin/sh -c "<path> &" on Unix) so it outlives the parent process.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 01:31 PM
analyzed
Aug 5, 2026, 02:01 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.