LWA-2026-10363 MAL-2026-13154 ↗ confirmed malware

dolyame-ui-filter@35.5.3

Malicious code in dolyame-ui-filter (npm)

T1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071 · Application Layer ProtocolT1082 · System Information DiscoveryT1106 · Native API

Analysis

On require, this package (a "UI toolkit") fingerprints the OS/architecture and downloads a platform-specific binary from three Cloudflare Workers hosts (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe, with a DNS-TXT chunked-transfer fallback from c[.]sdk[.]dl[.]wel1[.]ru. The fetched binary is written to /var/tmp/.cache_<hex> (or %TEMP%\dotnet_diag_<hex>.exe on Windows), made executable, and launched as a detached background process via cmd.exe /c start /b or /bin/sh -c "fp &". The package executes this remote binary download-and-run automatically on import, with no user interaction.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 02:06 PM
analyzed
Aug 5, 2026, 03:52 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.