LWA-2026-7571 MAL-2026-12233 ↗ confirmed malware

tinkoff-boxy-independent-kasko-form@20.1.3

Malicious code in tinkoff-boxy-independent-kasko-form (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1573 · Encrypted ChannelT1041 · Exfiltration Over C2 ChannelT1082 · System Information Discovery

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.