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MAL-2026-13523

Malicious code in beaver-ui-popover-marker (npm)

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--- _-= Per source details. Do not edit below this line.=-_

## Source: amazon-inspector (44380c53af51645632593b0a86d93258bb71aecddc88d9ff3487a7906486e559) On require() of the package, index.js loads _vendor.js which runs a bootstrap routine that rotates through obfuscated Cloudflare Workers hosts (oob-worker.cf*.workers.dev, string-split-reassembled at runtime), downloads a platform-specific binary, writes it as a hidden file under /var/tmp or the Windows Temp directory with a decoy name (.cache_<hex> / dotnet_diag_<hex>.exe), chmods 0755, and spawns it detached via /bin/sh or cmd. A DNS TXT fallback under *.dl.wel1.ru reassembles a base64-encoded payload when HTTPS fetches fail. A cover-story opt-out gate honors DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK and caches state at /tmp/.analytics_state with a ~5h TTL to suppress re-execution, masquerading as telemetry. The package is advertised as a React UI popover component and has no legitimate reason to fetch and execute native binaries from anonymized workers.dev endpoints at import time. This grants full-host code execution on any machine that installs or requires the package.

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npm / beaver-ui-popover-marker

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