LWA-2026-10180 MAL-2026-13268 ↗ confirmed malware

devplatform-test-pvm-is-odd@35.3.9

Malicious code in devplatform-test-pvm-is-odd (npm)

T1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1027 · Obfuscated Files or Information

Analysis

On require, the package runs a bootstrap that downloads a platform-specific second-stage binary over HTTPS from Cloudflare Workers endpoints (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, and /pkg/package.exe, with a DNS-TXT chunked base64 fallback via c[.]sdk[.]dl[.]wel1[.]ru (and sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The downloaded payload 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 (cmd.exe /c start /b on Windows, /bin/sh -c '<file> &' on POSIX). The bootstrap uses string-concatenated obfuscation for all endpoint hostnames.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 01:40 PM
analyzed
Aug 5, 2026, 01:59 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.