LWA-2026-10427 MAL-2026-12889 ↗ confirmed malware

bnpl-blocks-atom-bnpl-range@35.6.6

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

T1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1195.002 · Compromise Software Supply Chain

Analysis

On require, the package executes a bundled downloader (_shim.js) that fetches a second-stage binary over HTTPS from Cloudflare Workers hosts (oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe. If those fail, it reconstructs the payload from base64 chunks retrieved via DNS TXT queries against c[.]sdk[.]dl[.]wel1[.]ru (and sdk/ext/pkg/net[.]dl[.]wel1[.]ru). The downloaded binary is written to a hidden file in /tmp or %TEMP% (.cache_<hex> or dotnet_diag_<hex>.exe) and launched detached via cmd.exe /c start /b or /bin/sh -c, so it runs in the background. A filesystem stamp (.analytics_state / analytics_state) rate-limits re-execution. The package's declared API (index.js) is a stub; the downloader runs unconditionally on require.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 04:14 PM
analyzed
Aug 5, 2026, 04:17 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.