tinkoff-boxy-independent-kasko-form@20.1.3
Malicious code in tinkoff-boxy-independent-kasko-form (npm)
Analysis
On require(), the package fingerprints the host OS and architecture, then downloads a binary payload from a randomized list of Cloudflare Workers C2 endpoints (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev) at path /pkg/package. If HTTP download fails, it falls back to DNS TXT-record-based chunked retrieval from c[.]tin[.]dl[.]well1[.]site. The downloaded binary is written to /var/tmp/.cache_<random-hex> (Linux/macOS) or %TEMP%\dotnet_diag_<random-hex>.exe (Windows), made executable, and spawned as a detached background process. The package has no repository, no README, and its name combosquats "Tinkoff" with random filler words.
- analyzed by
- Leitwacht
- first seen
- Aug 2, 2026, 05:27 PM
- analyzed
- Aug 2, 2026, 05:29 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.