LWA-2026-10286 MAL-2026-12719 ↗ confirmed malware

devplatform-jscodeshift-utils@35.3.8

Malicious code in devplatform-jscodeshift-utils (npm)

T1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information Discovery

Analysis

On require, the package downloads and executes a remote binary. It fingerprints the OS/architecture, then fetches a payload over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, and oob-worker[.]cf102-baf[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe), with a fallback download channel that reassembles base64 chunks served via DNS TXT records under c[.]sdk[.]dl[.]wel1[.]ru. The downloaded content is written to a hidden cache file (.cache_<hex> in /var/tmp, 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 "&" on Unix).

analyzed by
Leitwacht
first seen
Aug 5, 2026, 01:33 PM
analyzed
Aug 5, 2026, 03:04 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.