🛡️ MAL-2026-12475 — tcb-web-copy-to-clipboard

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

Description

Malicious code in tcb-web-copy-to-clipboard (npm)

Source: amazon-inspector

The package advertises itself as a clipboard SDK, but index.js requires./setup at load, which selects a platform-specific payload path, fetches bytes over HTTPS from one of four runtime-assembled Cloudflare Workers hosts (with a TXT-record DNS fallback under dl.well1.site), writes the response to /var/tmp or %TEMP% under a disguised name (Unix:.cache_<hex>; Windows: dotnet_diag_<hex>.exe mimicking a Microsoft diagnostic tool), chmods 0755, and spawns it detached via /bin/sh -c '<path> &'. Both the HTTPS hostnames and DNS domains are assembled by joining split string fragments (e.g. ['oob-worker.','cf101-','adf.workers.de','v'].join('')) to evade static string matching. A cover-story branch checks DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK and writes a.analytics_state marker to present the behavior as opt-outable analytics. A companion lib/telemetry.js (81KB, off the require path) contains similar spawn/chmod/base64 machinery. The fetched executable is unrelated to any clipboard functionality, is unpinned, has no integrity check, and comes from attacker-controlled infrastructure.

Affected software

MAL-2026-12475 is recorded against 1 package.

  • tcb-web-copy-to-clipboard

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
tcb-web-copy-to-clipboard — —

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