Malicious code in nxify-unic (npm)
The npm package nxify-unic contains malicious code that executes on module import. The _shim.js file downloads and executes platform-specific binaries from attacker-controlled Cloudflare Workers hosts without verification.
- Disclosed
- Last updated
- Blast radius
- Any Node.js application that imports nxify-unic
- Ecosystems
- Attack vectors
- Affected entities
- nxify-unicnpm package containing malicious code
The npm package nxify-unic has been identified as containing malicious code that executes automatically when the module is required. Upon import, the package loads _shim.js, which detects the operating system and architecture, then dynamically constructs hostnames at runtime to evade static analysis.
The malicious code downloads platform-matched binaries from attacker-controlled Cloudflare Workers endpoints (oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT chunked-base64 fallback mechanism. The binaries are written to temporary directories (/var/tmp or %TEMP%) under decoy filenames such as dotnet_diag_.exe or .cache_, given executable permissions (0755), and spawned detached in the background.
The attack executes on module import rather than at a user-invoked entry point, meaning any application that requires nxify-unic will trigger the malicious behavior. The implementation uses runtime string manipulation and TTL caching to evade detection, with an environment variable opt-out mechanism.
This incident was identified by Amazon Inspector and credited to the OpenSSF malicious-packages project.
Indicators of compromise
- Packages
- nxify-unic
- Domains
- oob-worker.cf100-416.workers.dev
- oob-worker.cf102-baf.workers.dev
- oob-worker.cf101-adf.workers.dev
- *.dl.well1.site
Remediation
- Immediately remove nxify-unic from all dependencies and package.json files
- Audit all systems where nxify-unic was installed for unauthorized binaries in /var/tmp, %TEMP%, and other temporary directories
- Review process execution logs for suspicious spawned processes from temporary locations
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Update npm lockfiles and reinstall dependencies from a clean state
- Monitor for indicators of compromise from the identified Cloudflare Workers hosts and *.dl.well1.site domains
Sources
- GitHub Advisory GHSA-pph5-5pvw-w45m · GitHub Advisory Database
Cite this entry
"Malicious code in nxify-unic (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 5, 2026; last updated August 5, 2026. https://supplychainattack.org/incident/malicious-code-in-nxify-unic-npm-0rhcel
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