LWA-2026-10291 MAL-2026-13197 ↗ confirmed malware

dolyame-ui-tooltip@35.8.8

Malicious code in dolyame-ui-tooltip (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1071.004 · DNST1564.003 · Hidden Window

Analysis

dolyame-ui-tooltip is a trojanized npm package that masquerades as a React UI-tooltip component but executes a dropper on require(). The dropper (lib/_adapter.js) downloads a second-stage binary over HTTPS from Cloudflare Workers hosts oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, and oob-worker[.]cf99-9b3[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If the download fails it falls back to a DNS-TXT chunked base64 channel via c[.]sdk[.]dl[.]wel1[.]ru. The payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the temp dir on Windows), made executable, and launched as a detached background process (cmd.exe /c start /b on Windows, /bin/sh -c "<path> &" on POSIX) with hidden window and ignored stdio. The package has no repository and no install scripts; the payload runs simply by importing the module.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 03:06 PM
analyzed
Aug 5, 2026, 03:20 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.