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containedcritical

Malicious code in statist-browser-typed-client-hra.workplacer.events (npm)

The npm package statist-browser-typed-client-hra.workplacer.events contained malicious code that downloads and executes platform-specific binaries from attacker-controlled hosts on package import, enabling arbitrary remote code execution.

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Disclosed
Last updated
Blast radius
Any system that installed or imported the malicious package version(s)
Ecosystems
Attack vectors
Affected entities
  • statist-browser-typed-client-hra.workplacer.eventsnpm package containing malicious dropper code

The npm package statist-browser-typed-client-hra.workplacer.events was found to contain malicious code that executes on require of the package's main entry point (index.js). The malicious payload downloads platform-specific binaries from attacker-controlled infrastructure, including Cloudflare Workers subdomains (oob-worker.cf102-baf.workers.dev and similar) with DNS TXT-record fallback to *.dl.well1.site.

The dropper mechanism writes fetched bytes to /var/tmp/.cache_ on Unix systems or %TEMP%\dotnet_diag_.exe on Windows, sets executable permissions (chmod 0755), and spawns the binary detached via shell commands (/bin/sh -c or cmd /c start). A secondary loader in lib/telemetry.js, labeled as an Analytics SDK, implements the same dropper primitives as an alternate execution path.

The package advertises itself as an event-emitter client, but the fetched binaries use disguised names (cache file, dotnet_diag) unrelated to that stated purpose. Host and API names are obfuscated by splitting across array literals and reassembled at runtime to evade static analysis.

The result is arbitrary remote code execution on any machine that installs or imports this package. The incident was identified by the OpenSSF malicious-packages project.

Indicators of compromise

Packages
  • statist-browser-typed-client-hra.workplacer.events
Domains
  • oob-worker.cf102-baf.workers.dev
  • dl.well1.site

Remediation

  • Immediately uninstall the statist-browser-typed-client-hra.workplacer.events package from all systems
  • Audit npm package.json and lock files for any dependency on this package
  • Review system logs and process execution history on affected machines for signs of binary execution from /var/tmp/.cache_ or %TEMP%\dotnet_diag_.exe
  • Check for outbound DNS queries to *.dl.well1.site or Cloudflare Workers subdomains (oob-worker.cf102-baf.workers.dev pattern)
  • Regenerate credentials and API keys on any affected systems
  • Monitor for indicators of compromise from the fetched and executed binaries

Sources

  1. GitHub Advisory GHSA-cp53-cjcf-6fwx · GitHub Advisory Database

Cite this entry

"Malicious code in statist-browser-typed-client-hra.workplacer.events (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 5, 2026; last updated August 5, 2026. https://supplychainattack.org/incident/malicious-code-in-statist-browser-typed-client-hra-workplacer-events-npm-0v6fnd

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