bnpl-blocks-atom-bnpl-popup@35.4.7
Malicious code in bnpl-blocks-atom-bnpl-popup (npm)
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
Related advisories
- bnpl-blocks-atom-bnpl-skeleton@35.6.3
- devplatform-nx-ts@35.1.3
- bnpl-blocks-mobile-bnpl-separator@35.5.2
- bnpl-blocks-independent-bnpl-open-api@35.1.2
- dolyame-ui-portal@35.3.6
- dolyame-boxy-desktop-bnpl-title@35.6.5
- bigops-activity-headers-interceptor@35.6.8
- bigops-products-mobile@35.6.8
Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.