sso-tramvai-lib-roles@20.8.3
Malicious code in sso-tramvai-lib-roles (npm)
Analysis
On require(), the package fingerprints the host platform (OS, architecture) and attempts to download a platform-specific binary payload from three Cloudflare Workers C2 hosts (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev) via HTTPS GET to paths like /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If HTTP download fails, it falls back to a DNS TXT-record-based exfiltration channel via c[.]tin[.]dl[.]well1[.]site. The downloaded binary is written to /var/tmp/.cache_<hex> (or %TEMP%\dotnet_diag_<hex>.exe on Windows), made executable, and spawned as a detached background process that outlives the parent.
- analyzed by
- Leitwacht
- first seen
- Aug 2, 2026, 03:17 PM
- analyzed
- Aug 2, 2026, 03:19 PM
Related advisories
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- tramvai-module-feature-toggle@20.5.3
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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.