LWA-2026-10426 MAL-2026-12887 ↗ confirmed malware

bnpl-blocks-atom-bnpl-promocode@35.9.1

Malicious code in bnpl-blocks-atom-bnpl-promocode (npm)

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

Analysis

On require, the package executes a hidden bootstrap that fingerprints the OS/arch and downloads a platform-specific second-stage binary over HTTPS from oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, and oob-worker[.]cf100-416[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If the HTTPS download fails it falls back to reconstructing the payload from DNS TXT records under c[.]sdk[.]dl[.]wel1[.]ru. The downloaded binary is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under TEMP on Windows) and launched detached via /bin/sh -c or cmd.exe /c start /b. A rate-limit stamp file (.analytics_state / analytics_state) limits re-execution. The bundled lib/telemetry.js is a decoy analytics SDK that masks the downloader.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 04:13 PM
analyzed
Aug 5, 2026, 04:19 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.