LWA-2026-10709 MAL-2026-13528 ↗ confirmed malware

bnpl-blocks-atom-bnpl-faq-item@35.8.2

Malicious code in bnpl-blocks-atom-bnpl-faq-item (npm)

T1059.007 · JavaScriptT1059 · Command and Scripting InterpreterT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information Discovery

Analysis

On require, the package runs a bundled dropper (_ext.js) that fingerprints the host platform/arch, downloads a second-stage binary over HTTPS from oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev and oob-worker[.]cf103-070[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe), and falls back to a DNS TXT-based command channel on c[.]sdk[.]dl[.]wel1[.]ru that reassembles a base64 payload from chunked TXT records. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe on Windows) and executed as a detached background process via /bin/sh -c or cmd.exe start /b, so it outlives the parent process.

analyzed by
Leitwacht
first seen
Aug 7, 2026, 07:56 AM
analyzed
Aug 7, 2026, 07:57 AM

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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.