🛡️ MAL-2026-12613 — claims-domain

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Malicious code in claims-domain (npm)

Source: amazon-inspector

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 software

MAL-2026-12613 is recorded against 1 package.

  • claims-domain

Timeline and source

Published on 5 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.npmjs.com (Package)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-08-05
Updated 2026-08-12
Modified 2026-08-05
Fix URL N/A

Affected Packages

Software From version Fixed in
claims-domain — —

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