LWA-2026-10425 MAL-2026-12885 ↗ confirmed malware

bnpl-blocks-atom-bnpl-popup@35.4.7

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

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1573 · Encrypted ChannelT1082 · System Information Discovery

Analysis

On require, this package downloads and executes a second-stage binary. It fingerprints the host platform/arch, then fetches a binary over HTTPS from rotating Cloudflare Workers endpoints (oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf102-baf[.]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 retrieves the payload in base64 chunks via DNS TXT records from c[.]sdk[.]dl[.]wel1[.]ru (and platform variants ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The downloaded binary is written to a hidden cache file (.cache_<hex> in /var/tmp, or dotnet_diag_<hex>.exe in the Windows temp dir), made executable, and launched as a detached background process (cmd.exe /c start /b on Windows, /bin/sh -c "<path> &" on Unix) so it outlives the parent. A marker file (.analytics_state / analytics_state) throttles re-execution.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 04:13 PM
analyzed
Aug 5, 2026, 04:20 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.