bnpl-blocks-atom-bnpl-info-card@35.7.3
Malicious code in bnpl-blocks-atom-bnpl-info-card (npm)
Analysis
On require, the package downloads and executes a remote binary. It fingerprints the OS/arch, then fetches a payload from Cloudflare Workers hosts oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, and oob-worker[.]cf103-070[.]workers[.]dev at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If those fail it reassembles a base64 payload from DNS TXT records under dl[.]wel1[.]ru (queried as c[.]sdk[.]dl[.]wel1[.]ru). The downloaded binary is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the temp dir on Windows), made executable, and launched as a detached background process via cmd.exe /c start /b or /bin/sh -c. A timestamped cache stamp file limits re-downloads. The package's own code is a stub class with no legitimate functionality.
- analyzed by
- Leitwacht
- first seen
- Aug 5, 2026, 01:02 PM
- analyzed
- Aug 5, 2026, 01:29 PM
Related advisories
- bnpl-blocks-atom-bnpl-feedback@35.7.5
- bigops-watermark@35.9.5
- bnpl-blocks-atom-bnpl-news-card@35.6.8
- bigops-tasks@35.1.4
- bigops-tcrm-auth@35.8.5
- bigops-timeline-ui@35.5.8
- bigops-telephony-ui@35.7.3
- bigops-telephony@35.8.4
Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.