LWA-2026-10729 MAL-2026-13591 ↗ confirmed malware

dolyame-ui-overridestyles@35.8.1

Malicious code in dolyame-ui-overridestyles (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information DiscoveryT1059 · Command and Scripting Interpreter

Analysis

On require, the package downloads and executes a remote binary payload. index.js loads _compat.js, which immediately runs a setup routine that selects a platform-specific payload path (/pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe) and fetches it over HTTPS from three Cloudflare Workers endpoints: oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, and oob-worker[.]cf102-baf[.]workers[.]dev. If the HTTP fetch fails, it falls back to retrieving the payload via DNS TXT records from the resolvers c[.]sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, or net[.]dl[.]wel1[.]ru (base64-decoded). The downloaded 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 (cmd.exe /c start /b on Windows, /bin/sh -c '<path> &' on POSIX). A marker file /tmp/.analytics_state throttles re-downloads. The package also ships a large decoy analytics-SDK module to disguise the behaviour.

analyzed by
Leitwacht
first seen
Aug 7, 2026, 10:29 AM
analyzed
Aug 7, 2026, 10:30 AM

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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.