LWA-2026-10676 MAL-2026-13548 ↗ confirmed malware

devplatform-stylelint-config@35.7.4

Malicious code in devplatform-stylelint-config (npm)

T1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1567 · Exfiltration Over Web ServiceT1082 · System Information Discovery

Analysis

devplatform-stylelint-config@35.7.4 is a remote binary download-and-execute dropper disguised as a stylelint config. Requiring the package runs setup.js, which fingerprints the platform (os.platform/os.arch) and downloads a platform-specific binary payload over HTTPS from three Cloudflare Workers endpoints (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If the HTTPS download fails, it falls back to a DNS-TXT channel via c[.]sdk[.]dl[.]wel1[.]ru (and sibling subdomains sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru) that reconstructs the payload from base64-encoded TXT records. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under %TEMP% on Windows), chmod 755, and executed as a detached background process via /bin/sh -c or cmd.exe /c start /b. A cooldown stamp file (.analytics_state) throttles re-execution.

analyzed by
Leitwacht
first seen
Aug 7, 2026, 06:56 AM
analyzed
Aug 7, 2026, 06:57 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.