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Malicious code in sme-rko-finance-front-operations-widget-domain (npm)

The npm package sme-rko-finance-front-operations-widget-domain contains malicious code that downloads and executes attacker-controlled native binaries on package import. The malware uses Cloudflare Workers subdomains as primary delivery and DNS TXT records under *.dl.wel1.ru as a covert fallback channel.

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Disclosed
Last updated
Blast radius
All consumers of sme-rko-finance-front-operations-widget-domain npm package
Ecosystems
Attack vectors
Affected entities
  • sme-rko-finance-front-operations-widget-domainnpm package containing malicious code in index.js and _compat.js

The npm package sme-rko-finance-front-operations-widget-domain has been identified as containing malicious code. Upon require() of the package, index.js loads _compat.js, which initiates download of platform-specific native binaries from Cloudflare Workers subdomains under oob-worker.cf*.workers.dev.\n\nIf the primary delivery fails, the malware reassembles the payload from base64-encoded DNS TXT records under *.dl.wel1.ru. Destination hostnames and fallback resolver domains are obfuscated by joining split string fragments at runtime to evade static code inspection.\n\nThe downloaded binary is written to /var/tmp or %TEMP% under disguised names such as .cache_ or dotnet_diag_.exe, given execute permissions (0755), and spawned detached via /bin/sh -c or cmd.exe. The malware uses naming conventions (analytics_state, DISABLE_TELEMETRY, dotnet_diag_*.exe) and cooldown timestamps to present the behavior as benign telemetry, while actually fetching and executing attacker-controlled native code on every consumer that imports the package.\n\nThe DNS-TXT fallback mechanism provides a covert delivery channel designed to bypass HTTP egress controls. This incident was identified by the OpenSSF malicious-packages project.

Indicators of compromise

Packages
  • sme-rko-finance-front-operations-widget-domain
Domains
  • oob-worker.cf*.workers.dev
  • *.dl.wel1.ru

Remediation

  • Immediately remove sme-rko-finance-front-operations-widget-domain from all projects and dependencies
  • Audit all systems that have imported this package for signs of unauthorized binary execution or network connections to oob-worker.cf*.workers.dev or *.dl.wel1.ru domains
  • Review process execution logs for spawned binaries with names matching `.cache_*` or `dotnet_diag_*`
  • Monitor for DNS queries to *.dl.wel1.ru and block these domains at the network level
  • Rotate credentials and review system access logs on any machine that imported this package
  • Update npm dependencies and verify package integrity from trusted sources

Sources

  1. GitHub Advisory GHSA-q26r-96fx-86h6 · GitHub Advisory Database

Cite this entry

"Malicious code in sme-rko-finance-front-operations-widget-domain (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-widget-domain-npm-15lpyw

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