Malicious code in dolyame-ui-inputfio (npm)
The npm package dolyame-ui-inputfio contained malicious code that executes on require(), fetching and executing a binary payload from attacker-controlled infrastructure. The package used obfuscation techniques to evade static analysis and presented itself as an analytics SDK.
- Disclosed
- Last updated
- Blast radius
- Any developer or application that installed and required the dolyame-ui-inputfio package; potential for arbitrary code execution on developer machines and production systems.
- Ecosystems
- Attack vectors
- Affected entities
- dolyame-ui-inputfionpm package containing malicious dropper code
The npm package dolyame-ui-inputfio was found to contain malicious code that executes unconditionally when the package is imported. The malicious behavior is present in both adapter.js and lib/telemetry.js, which reconstruct destination hostnames from obfuscated string fragments pointing to attacker-controlled Cloudflare Workers domains (oob-worker.cf1-03-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) with DNS fallback to *.dl.wel1.ru.\n\nUpon execution, the code fetches an opaque binary payload over HTTPS using base64 chunking, with a DNS-TXT fallback mechanism. The payload is written to /tmp/.cache on Unix systems or %TEMP%\dotnet_diag_.exe on Windows, made executable via chmod 0755, and then spawned as a detached process using /bin/sh -c or cmd.\n\nThe malicious code employs deliberate evasion techniques including split-string obfuscation of privileged Node APIs (e.g., require("child_" + "process"), fs["chmod"+"Sync"]) and array-join obfuscation of hostnames to evade static string matching detection. The main export lib/telemetry.js is disguised as an 'Analytics SDK' but contains identical dropper primitives.\n\nThe incident was identified by the OpenSSF malicious-packages project and reported via GitHub Security Advisory GHSA-5hrm-fcxr-3cwv.
Indicators of compromise
- Packages
- dolyame-ui-inputfio
- Domains
- oob-worker.cf1-03-070.workers.dev
- oob-worker.cf100-416.workers.dev
- oob-worker.cf99-9b3.workers.dev
- *.dl.wel1.ru
Remediation
- Immediately uninstall dolyame-ui-inputfio from all projects and development environments
- Audit npm install logs and dependency trees to identify all systems where this package was installed
- Scan affected systems for the presence of /tmp/.cache_ (Unix) or %TEMP%\dotnet_diag_.exe (Windows) and any spawned child processes
- Review network logs for connections to oob-worker.cf*.workers.dev or *.dl.wel1.ru domains
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Update to a clean version of any legitimate package this was impersonating, if applicable
- Monitor for indicators of compromise from the binary payload execution
Sources
- GitHub Advisory GHSA-5hrm-fcxr-3cwv · GitHub Advisory Database
Cite this entry
"Malicious code in dolyame-ui-inputfio (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-inputfio-npm-1ouqkz
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