bigops-tinkoff-telephony-mock@35.5.1
Malicious code in bigops-tinkoff-telephony-mock (npm)
Analysis
On require, the package loads a bundled downloader (_runtime.js) that fetches a platform-specific binary payload over HTTPS from Cloudflare Workers hosts oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, and oob-worker[.]cf103-070[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe), with a fallback DNS-TXT channel via c[.]sdk[.]dl[.]wel1[.]ru (and ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The downloaded binary is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the temp dir on Windows), made executable, and launched detached in the background via /bin/sh -c '<path> &' or cmd.exe /c start /b. A stamp file at /tmp/.analytics_state throttles re-execution. This is remote binary download-and-execute at package load time.
- analyzed by
- Leitwacht
- first seen
- Aug 5, 2026, 12:59 PM
- analyzed
- Aug 5, 2026, 01:08 PM
Related advisories
- bigops-telephony-ui-adapter@35.6.4
- bigops-ui-kit@35.9.2
- bigops-timeline@35.4.9
- bigops-tslint@35.9.4
- bigops-tasks-client@35.1.2
- bigops-stylelint@35.4.3
- bigops-umf-statist@35.3.1
- @zahlen/checkout-angular@0.1.4
Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.