Malicious code in dolyame-ui-checkablegroup (npm)
The npm package dolyame-ui-checkablegroup contained malicious code that executed a dropper on require, downloading and executing platform-specific binaries from attacker-controlled infrastructure. The package used obfuscated hostname construction, spoofed file names, and covert DNS-TXT channels to evade detection.
- Disclosed
- Last updated
- Blast radius
- Any developer or application that installed or required the dolyame-ui-checkablegroup package
- Ecosystems
- Attack vectors
- Affected entities
- dolyame-ui-checkablegroupnpm package presenting as UI checkable-group helper
The npm package dolyame-ui-checkablegroup was distributed with embedded malicious code designed to execute immediately upon being required. Rather than providing the advertised UI helper functionality, the package contained a dropper mechanism in both _helpers.js and the main-exported lib/telemetry.js.
The malware employed several evasion techniques: hostnames were assembled at runtime from split-string arrays (e.g., ["oob-worker.cf1","00-416.work","er","s.dev"].join("") to construct oob-worker.cf100-416.workers.dev), and downloaded binaries were written to temporary directories under spoofed names mimicking legitimate Microsoft diagnostic tools (dotnet_diag_.exe, .cache_). Execution was performed detached via shell spawning to avoid blocking the parent process.
A secondary covert channel used DNS-TXT records under *.dl.wel1.ru to reassemble base64-encoded payloads from numbered subdomains, providing an alternative delivery mechanism. No cryptographic verification of downloaded binaries was performed.
The malicious code was duplicated across multiple entry points to ensure execution regardless of how the package was imported, indicating deliberate design for maximum impact.
Indicators of compromise
- Packages
- dolyame-ui-checkablegroup
- Domains
- oob-worker.cf100-416.workers.dev
- cf101-adf
- cf103-070
- dl.wel1.ru
Remediation
- Immediately remove dolyame-ui-checkablegroup from all projects and dependencies
- Audit package-lock.json and yarn.lock files for any installation of this package
- Review system logs and process execution history on any machines where this package was installed for signs of binary downloads or execution from /tmp or %TEMP%
- Monitor for outbound HTTPS connections to oob-worker.cf100-416.workers.dev, cf101-adf, cf103-070, and DNS queries to *.dl.wel1.ru
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Update npm to the latest version and run `npm audit` to identify other potentially compromised dependencies
Sources
- GitHub Advisory GHSA-hw66-qprf-ggq5 · GitHub Advisory Database
Cite this entry
"Malicious code in dolyame-ui-checkablegroup (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-checkablegroup-npm-pt0s93
Suggest a correction
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