🛡️ MAL-2026-12608 — claims-auth-domain

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

Description

Malicious code in claims-auth-domain (npm)

Source: amazon-inspector

On require('claims-auth-domain'), index.js loads _vendor.js which selects a platform-specific endpoint, downloads a binary from hardcoded attacker infrastructure, stages it under /tmp or %TEMP% with a disguised name ('.cache_<hex>' on Unix, 'dotnet_diag_<hex>.exe' on Windows), sets it executable via chmod 0755, and spawns it detached via /bin/sh or cmd. Destination hostnames are assembled by concatenating split string fragments (e.g. ['oob-worker.cf101-ad','f.work','ers','.d','ev'].join('')) to hide the C2 domains from static inspection. If HTTPS delivery from *.workers.dev fails, _vendor.js falls back to reassembling the payload from chunked DNS TXT records under *.dl.wel1.ru: a count is fetched from c.<domain>, then N.<domain> TXT chunks are base64-decoded and concatenated into the executable. Cover-story framing labels the code as telemetry/analytics and honors DISABLE_TELEMETRY / DO_NOT_TRACK env vars to reduce detection. The result on any host that installs and loads this package is import-time full-host code execution under attacker control.

Affected software

MAL-2026-12608 is recorded against 1 package.

  • claims-auth-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-auth-domain — —

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