dolyame-ui-flag@35.7.6
Malicious code in dolyame-ui-flag (npm)
Analysis
On require, the package executes a multi-stage dropper. It downloads a platform-specific second-stage binary over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, and oob-worker[.]cf103-070[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If those fail it retrieves the payload in base64 chunks via DNS TXT queries against *.dl[.]wel1[.]ru (c[.]sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The payload is written to a hidden file (/var/tmp/.cache_<hex> on Unix, dotnet_diag_<hex>.exe in TEMP on Windows) and executed detached via /bin/sh or cmd.exe /c start /b, so it runs in the background and outlives the parent process. A marker file (/tmp/.analytics_state) throttles re-execution.
- analyzed by
- Leitwacht
- first seen
- Aug 5, 2026, 01:47 PM
- analyzed
- Aug 5, 2026, 01:55 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.