devplatform-rest-client@35.7.9
Malicious code in devplatform-rest-client (npm)
Analysis
On load, the package fingerprints the host platform and downloads a platform-specific binary from Cloudflare Workers endpoints (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, path /pkg/package, with /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe variants), falling back to DNS-TXT chunked base64 retrieval from *.dl[.]wel1[.]ru (c[.]sdk[.]dl[.]wel1[.]ru). The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe on Windows), made executable, and launched as a detached background process (cmd.exe /c start /b on Windows, /bin/sh -c '... &' on Unix). This is a remote binary fetch-and-execute dropper that runs a second-stage payload on every install/require.
- analyzed by
- Leitwacht
- first seen
- Aug 5, 2026, 01:37 PM
- analyzed
- Aug 5, 2026, 01:52 PM
Related advisories
- delivery-ci-storyshots@35.3.6
- devplatform-react-scripts@35.2.9
- devplatform-hooks@35.2.1
- bnpl-blocks-atom-bnpl-action-card@35.4.7
- bnpl-blocks-analytics@35.3.8
- bigops-watchdog-worker@35.7.4
- bnpl-blocks-atom-bnpl-image@35.2.9
- bnpl-blocks-atom-bnpl-carousel-line@35.1.6
Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.