LWA-2026-7558 MAL-2026-12487 ↗ confirmed malware

travel-core-utils-object@20.3.4

Malicious code in travel-core-utils-object (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1059 · Command and Scripting InterpreterT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1573 · Encrypted ChannelT1082 · System Information DiscoveryT1204.002 · Malicious File

Analysis

On require(), the package loads _bridge.js which silently downloads a platform-specific binary from Cloudflare Workers C2 infrastructure. It attempts HTTPS GETs to oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, and oob-worker[.]cf102-baf[.]workers[.]dev at path /pkg/package (or platform-specific variants). If HTTPS fails, it falls back to a DNS TXT-based data channel via c[.]tin[.]dl[.]well1[.]site. The downloaded binary is written to /var/tmp/.cache_<hex> (Linux/macOS) or %TEMP%\dotnet_diag_<hex>.exe (Windows) and executed as a detached background process. A cooldown stamp file at /tmp/.analytics_state prevents re-download within ~5.8 hours.

analyzed by
Leitwacht
first seen
Aug 2, 2026, 05:12 PM
analyzed
Aug 2, 2026, 05:13 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.