Malicious code in sme-rko-finance-front-operations-providers (npm)
The npm package sme-rko-finance-front-operations-providers contained malicious code that downloads and executes platform-specific binaries from attacker-controlled Cloudflare Workers subdomains and DNS-TXT fallback channels upon require().
- Disclosed
- Last updated
- Blast radius
- Any Node.js application that installed sme-rko-finance-front-operations-providers
- Ecosystems
- Attack vectors
- Affected entities
- sme-rko-finance-front-operations-providersnpm package containing malicious code in index.js and _bridge.js
The npm package sme-rko-finance-front-operations-providers was found to contain malicious code in its index.js and _bridge.js files. Upon require() of the package, the code assembles Cloudflare Workers subdomain hostnames from fragmented strings and downloads platform-specific binaries via HTTPS from attacker-controlled infrastructure (oob-worker.cf103-070.workers.dev, cf100-416, cf101-adf.workers.dev).
The downloaded executable is written to a decoy path under /tmp or %TEMP% with names like .cache_, .dotnet_diag_, or .exe, given execute permissions (chmod 0755 on Unix), and executed detached via shell spawn commands. The package implements a DNS-TXT fallback mechanism that resolves shards from wel1.ru (sdk.dl.wel1.ru) to reassemble base64-decoded payload bytes when HTTPS delivery is blocked.
The destination hosts are unrelated to the package publisher and its declared purpose. The fetched executable is opaque and unverified, indicating a supply chain compromise designed to execute arbitrary code on systems that install and require this package.
This incident was identified by the OpenSSF malicious-packages project and reported via GitHub Security Advisory GHSA-cg6q-c6gh-62q2.
Indicators of compromise
- Packages
- sme-rko-finance-front-operations-providers
- Domains
- oob-worker.cf103-070.workers.dev
- cf101-adf.workers.dev
- sdk.dl.wel1.ru
- wel1.ru
Remediation
- Immediately uninstall sme-rko-finance-front-operations-providers from all projects
- Audit npm package.json and lock files for any presence of this package
- Review system logs and process execution history on machines where this package was installed for signs of unauthorized binary execution
- Check for unexpected network connections to Cloudflare Workers subdomains (*.workers.dev) and wel1.ru domains
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Update to a patched version if available, or use an alternative package for the intended functionality
Sources
- GitHub Advisory GHSA-cg6q-c6gh-62q2 · GitHub Advisory Database
Cite this entry
"Malicious code in sme-rko-finance-front-operations-providers (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 8, 2026; last updated August 8, 2026. https://supplychainattack.org/incident/malicious-code-in-sme-rko-finance-front-operations-providers-npm-wfc2dr
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