delivery-ci-sage@35.6.3
Malicious code in delivery-ci-sage (npm)
Analysis
delivery-ci-sage@35.6.3 is a multi-stage remote binary downloader-and-executor. Requiring the package triggers _loader.js, which fingerprints the platform/arch and downloads a platform-specific second-stage binary over HTTPS from oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, and oob-worker[.]cf102-baf[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If the HTTPS fetch fails it falls back to retrieving the payload in base64 chunks via DNS TXT records from c[.]sdk[.]dl[.]wel1[.]ru. The downloaded binary is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under %TEMP% on Windows), made executable, and launched as a detached background process. Execution is rate-limited to once per ~5.7-hour window via a state file.
- analyzed by
- Leitwacht
- first seen
- Aug 5, 2026, 01:30 PM
- analyzed
- Aug 5, 2026, 01:53 PM
Related advisories
- dolyame-ui-radio@35.2.2
- delivery-ci-storyshots@35.3.6
- devplatform-react-scripts@35.2.9
- devplatform-spa@35.1.4
- 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
Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.