MAL-2026-12613
Dashboard / Malicious Package / MAL-2026-12613
MAL-2026-12613
Summary: Malicious code in claims-domain (npm)
Details: Source: amazon-inspector (f75c174b3db5e2480eabc7c7f8ab5e8366737fac8e76086da13f8acac6545813) On require of the package, `index.js` loads `_ext.js`, which reconstructs destination hostnames from string-split arrays (e.g. `["oob-worker.cf99-9b3",".wor","kers.","dev"].join("")`) to build URLs at `oob-worker.cf99-9b3.workers.dev`, `oob-worker.cf103-070.workers.dev`, and `oob-worker.cf102-baf.workers.dev`, with a DNS TXT fallback to `sdk.dl.wel1.ru`, `ext.dl.wel1.ru`, `pkg.dl.wel1.ru`, and `net.dl.wel1.ru`. The fetched platform-specific binary is written to `/var/tmp` or the Windows temp directory under disguised filenames (`.cache_<hex>`, `dotnet_diag_<hex>.exe`), chmodded to 0755, and spawned detached via `/bin/sh -c` or `cmd /c start`. The `child_process` module and `fs.chmodSync` API are also referenced through string concatenation (`require("child_" + "process")`, `fs["chmod" + "Sync"]`) alongside cover-story comments describing the routine as an analytics/telemetry SDK. The package's advertised purpose (a claims-domain library) does not require fetching or executing native binaries from anonymous Cloudflare Workers subdomains, and the delivery is unpinned, unhashed, and obfuscated.
Affected packages
Package
Name: claims-domain
Purl: pkg:npm/claims-domain
Affected ranges
Type: N/A
Events:
