Malicious code in beaver-ui-form-modal (npm)
The npm package beaver-ui-form-modal contained malicious code that downloads and executes platform-specific binaries from attacker-controlled infrastructure upon require(). The package was identified by Amazon Inspector and credited to OpenSSF's malicious-packages repository.
- Disclosed
- Last updated
- Blast radius
- Any application that installed beaver-ui-form-modal
- Ecosystems
- Attack vectors
- Affected entities
- beaver-ui-form-modalnpm package containing malicious code
The npm package beaver-ui-form-modal was found to contain malicious code that executes on module import. When the package is required, index.js loads shim.js which initiates downloads of platform-specific binaries from attacker-controlled Cloudflare Worker subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev) with DNS-TXT chunked-base64 fallback to Russian domains (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru).\n\nThe downloaded binary is written to a hidden temporary path with names mimicking legitimate system utilities ('dotnet_diag', '.cache'), given execute permissions (0755), and spawned detached via shell invocation. Hostnames and API identifiers are obfuscated at runtime using array.join('') to evade static analysis. The fetched binary is unpinned, unverified, and unrelated to any UI form modal functionality.\n\nAdditionally, lib/telemetry.js contains a dormant sibling dropper mechanism framed as an 'analytics SDK' that could spawn further malicious processes. The malicious package was identified by Amazon Inspector and credited to the OpenSSF malicious-packages project.
Indicators of compromise
- Packages
- beaver-ui-form-modal
- Domains
- oob-worker.cf99-9b3.workers.dev
- oob-worker.cf102-baf.workers.dev
- oob-worker.cf100-416.workers.dev
- oob-worker.cf103-070.workers.dev
- sdk.dl.wel1.ru
- ext.dl.wel1.ru
- pkg.dl.wel1.ru
- net.dl.wel1.ru
Remediation
- Immediately remove beaver-ui-form-modal from all projects and dependencies
- Audit npm install logs and package-lock.json to identify all installations of beaver-ui-form-modal
- Review process execution logs on affected systems for spawned shell processes with detached stdio
- Block outbound connections to the identified malicious domains at network perimeter
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Consider the affected systems as potentially compromised and perform forensic analysis
- Update dependency scanning tools to detect and block this package
Sources
- GitHub Advisory GHSA-694p-cpwm-9w6r · GitHub Advisory Database
Cite this entry
"Malicious code in beaver-ui-form-modal (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 5, 2026; last updated August 5, 2026. https://supplychainattack.org/incident/malicious-code-in-beaver-ui-form-modal-npm-95n4gt
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