LWA-2026-10199 MAL-2026-13267 ↗ confirmed malware

devplatform-test-pvm-is-even@35.9.5

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

T1059.007 · JavaScriptT1059 · Command and Scripting InterpreterT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information DiscoveryT1027 · Obfuscated Files or Information

Analysis

On require, the package loads a runtime module that fingerprints the host platform/architecture and downloads a second-stage binary from Cloudflare Workers endpoints (oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, and /pkg/package.exe, with a DNS TXT fallback channel (c[.]sdk[.]dl[.]wel1[.]ru). The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the temp directory on Windows), made executable, and launched as a detached background process via cmd.exe /c start /b or /bin/sh -c "... &".

analyzed by
Leitwacht
first seen
Aug 5, 2026, 01:40 PM
analyzed
Aug 5, 2026, 02:09 PM

Related advisories

browse all confirmed advisories →

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