LWA-2026-10114 MAL-2026-12834 ↗ confirmed malware

bigops-stylelint@35.4.3

Malicious code in bigops-stylelint (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1059 · Command and Scripting Interpreter

Analysis

bigops-stylelint@35.4.3 (a combosquat of the stylelint package) runs a dropper on require. index.js loads _bootstrap.js, which downloads a platform-specific binary from Cloudflare Workers endpoints oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, and oob-worker[.]cf101-adf[.]workers[.]dev at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, and /pkg/package.exe. If HTTPS fails it falls back to DNS TXT-based payload retrieval via c[.]sdk[.]dl[.]wel1[.]ru (and sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The downloaded 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 via /bin/sh -c "<path> &" or cmd.exe /c start /b. The package also ships a decoy lib/telemetry.js analytics module. Rate-limited by a stamp file at /tmp/.analytics_state.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 12:58 PM
analyzed
Aug 5, 2026, 01:03 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.