Malicious code in dolyame-ui-generateid (npm)
The npm package dolyame-ui-generateid contains malicious code that fetches and executes platform-specific binary payloads from attacker-controlled Cloudflare Workers domains and DNS TXT records upon require(). The package uses obfuscation techniques including string fragmentation, property splitting, and staged payload delivery to evade detection.
- Disclosed
- Last updated
- Blast radius
- Any npm consumer of dolyame-ui-generateid
- Ecosystems
- Attack vectors
- Affected entities
- dolyame-ui-generateidnpm package containing malicious code in index.js and lib/telemetry.js
The npm package dolyame-ui-generateid was found to contain malicious code that executes on package import. The malicious behavior is implemented in two locations: index.js and lib/telemetry.js.
Upon require(), the package loads _shim.js which reconstructs attacker-controlled hostnames by concatenating string fragments: oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, and oob-worker.cf102-baf.workers.dev. A secondary DNS TXT-record fallback mechanism queries c. and base64 payload fragments from N. under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru.
The fetched binary payloads are written to temporary directories (/var/tmp on POSIX, %TEMP% on Windows) under disguised filenames such as .cache_ or dotnet_diag_.exe, made executable (chmod 0755 on POSIX), and spawned as detached processes via shell commands. A second dropper path in lib/telemetry.js decodes base64 chunks, sets executable permissions, and spawns the payload via /bin/sh.
The package employs multiple anti-analysis techniques including split-string require statements, split-property access patterns, array-join hostname assembly, and staged payload delivery via DNS TXT records. The stated purpose (UI ID-generation helper / observability SDK) does not justify fetching and executing native binaries from external sources.
Indicators of compromise
- Packages
- dolyame-ui-generateid
- Domains
- oob-worker.cf103-070.workers.dev
- oob-worker.cf99-9b3.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
- Immediately remove dolyame-ui-generateid from all projects and dependencies
- Audit npm package.json and lock files for any presence of dolyame-ui-generateid
- Review and revoke any credentials or secrets that may have been exposed on systems where the package was installed
- Monitor affected systems for unexpected process execution, network connections to the identified Cloudflare Workers domains and wel1.ru subdomains
- Block outbound connections to oob-worker.cf*.workers.dev and *.dl.wel1.ru at the network level
- Regenerate signing keys and credentials on any compromised systems
- Check npm audit logs and consider re-authentication if the package was installed from a shared account
Sources
- GitHub Advisory GHSA-r8h9-96j5-m5jm · GitHub Advisory Database
Cite this entry
"Malicious code in dolyame-ui-generateid (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-generateid-npm-1k1v6y
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