LWA-2026-10284 MAL-2026-12732 ↗ confirmed malware

devplatform-po-loader@35.1.8

Malicious code in devplatform-po-loader (npm)

T1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1059 · Command and Scripting InterpreterT1082 · System Information Discovery

Analysis

On require, this package downloads a binary payload and executes it. It fetches a binary over HTTPS from oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, and oob-worker[.]cf99-9b3[.]workers[.]dev at path /pkg/package (or /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe depending on OS/arch), with a DNS-TXT fallback retrieval channel from *.dl[.]wel1[.]ru. The fetched 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 via /bin/sh -c "<path> &" or cmd.exe /c start /b. The package's exported loader class is a decoy; the download-and-execute runs automatically when the module is loaded.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 01:36 PM
analyzed
Aug 5, 2026, 03:02 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.