Malicious code in dolyame-ui-inputsecure (npm)
The npm package dolyame-ui-inputsecure contained malicious code that downloads and executes platform-specific binaries from attacker-controlled endpoints during package installation or require. The dropper logic fetches executables from obfuscated Cloudflare workers.dev domains with DNS-TXT fallback to Russian domains, writes them to temporary directories, and spawns them as detached processes.
- Disclosed
- Last updated
- Blast radius
- Any developer or system installing the malicious dolyame-ui-inputsecure package; arbitrary code execution on host systems during installation.
- Ecosystems
- Attack vectors
- Affected entities
- dolyame-ui-inputsecurenpm package containing malicious dropper code
The npm package dolyame-ui-inputsecure was found to contain malicious code in its main entry point modules (shim.js and lib/telemetry.js). Upon package installation or require, the code fetches platform-specific executables from attacker-controlled endpoints.\n\nThe dropper mechanism uses obfuscated Cloudflare workers.dev endpoints (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT fallback to Russian domains (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru). The fetched payloads are base64-decoded and written to /tmp/.cache on Unix systems or %TEMP%\dotnet_diag_.exe on Windows, then executed via detached shell processes.\n\nThe malicious code uses obfuscation techniques including runtime string concatenation (array.join("")) and dynamic property access to defeat static analysis. The dropper logic is duplicated across multiple modules to ensure execution regardless of which module is loaded first, and is wrapped in an 'Analytics SDK' comment block as a cover story.\n\nThe incident was identified by the OpenSSF malicious-packages project and published via GitHub Security Advisory GHSA-3qg5-j2pg-gxwg on 2026-08-07.
Indicators of compromise
- Packages
- dolyame-ui-inputsecure
- Domains
- oob-worker.cf100-416.workers.dev
- oob-worker.cf103-070.workers.dev
- oob-worker.cf102-baf.workers.dev
- sdk.dl.wel1.ru
- ext.dl.wel1.ru
- pkg.dl.wel1.ru
- net.dl.wel1.ru
Remediation
- Remove the dolyame-ui-inputsecure package from all environments immediately
- Audit npm package.json and lock files for any dependency on dolyame-ui-inputsecure
- Inspect systems that installed this package for unexpected processes, network connections to the listed domains, or suspicious files in /tmp/.cache_ or %TEMP%\dotnet_diag_.exe
- Review process logs and network traffic for connections to oob-worker.cf*.workers.dev or wel1.ru domains
- Update to a clean version of any legitimate package this was impersonating, or use an alternative package
- Consider running malware scans on affected systems given the arbitrary code execution capability
Sources
- GitHub Advisory GHSA-3qg5-j2pg-gxwg · GitHub Advisory Database
Cite this entry
"Malicious code in dolyame-ui-inputsecure (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 7, 2026; last updated August 7, 2026. https://supplychainattack.org/incident/malicious-code-in-dolyame-ui-inputsecure-npm-k5hro5
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