LWA-2026-7443 MAL-2026-12442 ↗ confirmed malware

sso-tramvai-lib-roles@20.8.3

Malicious code in sso-tramvai-lib-roles (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1573 · Encrypted ChannelT1102 · Web ServiceT1082 · System Information DiscoveryT1041 · Exfiltration Over C2 Channel

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

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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.