Malicious code in sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-models (npm)
The npm package sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-models contained malicious code that downloads and executes platform-specific payloads from Cloudflare Workers endpoints. The dropper uses obfuscation techniques including runtime string reconstruction and multiple delivery mechanisms to evade detection.
- Disclosed
- Last updated
- Blast radius
- Any application that installed the malicious package version
- Ecosystems
- Attack vectors
- Affected entities
- sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-modelsnpm package containing malicious dropper code
The npm package sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-models was found to contain malicious code in its index.js entry point. On require, the package loads _bridge.js which selects a platform-specific asset path (linux_x64, linux_arm64, darwin, win32) and downloads executable payloads from rotating Cloudflare Workers endpoints.
The malicious code downloads bytes from a set of Cloudflare Workers endpoints (oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT discovery fallback under *.dl.wel1.ru. The downloaded payload is written to /var/tmp or the Windows TEMP directory using disguised names impersonating dotnet_diag and hidden dotfiles, then executed via /bin/sh -c or cmd.exe /c start /b.
The package employs multiple obfuscation techniques to evade static inspection, including runtime reconstruction of hostnames and API names from split-string fragments. A parallel dropper mechanism in lib/telemetry.js provides redundant payload delivery through base64 chunk assembly and spawning of /bin/sh. A filesystem stamp implements run-once deduplication to limit detection.
The malicious package was identified by the OpenSSF malicious-packages project (MAL-2026-13656).
Indicators of compromise
- Domains
- oob-worker.cf100-416.workers.dev
- oob-worker.cf99-9b3.workers.dev
- oob-worker.cf101-adf.workers.dev
- dl.wel1.ru
Remediation
- Immediately uninstall the sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-models package from all systems
- Audit npm package.json and lock files for any installations of this package
- Scan systems that installed this package for suspicious processes spawned from /bin/sh or cmd.exe with payloads in /var/tmp or TEMP directories
- Review process execution logs for spawning of hidden dotfiles or files impersonating dotnet_diag
- Block outbound connections to the identified Cloudflare Workers endpoints and *.dl.wel1.ru domain
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Update to a clean version of any legitimate dependencies this package may have replaced
Sources
- GitHub Advisory GHSA-xfv4-g237-3qv8 · GitHub Advisory Database
Cite this entry
"Malicious code in sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-models (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-payments-classic-payment-actions-operati-8hz7lw
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