The sso-tramvai-lib-roles npm package (version 20.8.3) is identified as malicious. It loads a runtime JavaScript file that detects the host OS and downloads an unsigned executable binary from obfuscated Cloudflare Workers domains, with a DNS TXT-record fallback mechanism. The binary is saved under misleading filenames, permissioned to execute, and launched detached via system shell commands on both Windows and Unix platforms. A secondary dropper module named telemetry.js is included in the package tarball, containing similar behavior but is not referenced by the main entry point. The package name mimics a legitimate Tramvai library but contains no genuine SSO or role management code.

This malicious package can execute arbitrary unsigned binaries on the host system without user consent or verification, potentially leading to full system compromise or further malware deployment. The use of obfuscated download URLs and fallback DNS TXT channels complicates detection and blocking. The presence of a secondary dropper module increases the attack surface. There is no indication of active exploitation in the wild at this time.

No official patch or remediation is available since this is a malicious package rather than a vulnerability in legitimate software. Users should immediately remove sso-tramvai-lib-roles version 20.8.3 from their projects and dependency trees. Avoid installing packages from untrusted or suspicious sources. Employ supply chain security measures such as verifying package provenance and using trusted registries. Monitor for any unexpected execution of binaries named like dotnet_diag_*.exe or .cache_* and investigate accordingly.