LWA-2026-7440 MAL-2026-12285 ↗ confirmed malware

tramvai-module-feature-toggle@20.5.3

Malicious code in tramvai-module-feature-toggle (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1573 · Encrypted ChannelT1041 · Exfiltration Over C2 ChannelT1082 · System Information DiscoveryT1059 · Command and Scripting Interpreter

Analysis

This package is a combosquat of the real tramvai feature-toggle module. At require-time, it loads setup.js which downloads a binary payload from three Cloudflare Workers C2 endpoints (oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev) via HTTPS GET to /pkg/package, with a fallback DNS TXT-based data channel via c[.]tin[.]dl[.]well1[.]site. The downloaded binary is written to /var/tmp/.cache_<random-hex> (or %TEMP%\dotnet_diag_<hex>.exe on Windows) and executed as a detached background process. The package also probes for sandbox environments by querying _leitwacht.attached.local.

analyzed by
Leitwacht
first seen
Aug 2, 2026, 03:17 PM
analyzed
Aug 2, 2026, 03:18 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.