LWA-2026-10407 MAL-2026-12944 ↗ confirmed malware

bnpl-blocks-desktop-bnpl-text-block@35.9.4

Malicious code in bnpl-blocks-desktop-bnpl-text-block (npm)

T1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1041 · Exfiltration Over C2 ChannelT1082 · System Information DiscoveryT1497 · Virtualization/Sandbox Evasion

Analysis

On require(), the package loads _platform.js, which fingerprints the OS/arch and downloads a second-stage binary over HTTPS from Cloudflare Workers endpoints (oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe. If those fail it reconstructs the payload from DNS TXT records chunked under c[.]sdk[.]dl[.]wel1[.]ru (and sdk/ext/pkg/net[.]dl[.]wel1[.]ru). The downloaded binary is written to /var/tmp/.cache_<hex> (or %TEMP%\dotnet_diag_<hex>.exe on Windows), chmodded 0755, and executed detached via cmd.exe /c start /b or /bin/sh -c. The package is a remote-code-download-and-execute dropper.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 01:22 PM
analyzed
Aug 5, 2026, 04:09 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.