Malicious code in dolyame-ui-inputmoney (npm)
The npm package dolyame-ui-inputmoney contained malicious code that downloads and executes platform-specific binaries from attacker-controlled infrastructure on package require. The malware uses obfuscated string concatenation to evade detection and falls back to DNS TXT covert channels when primary C2 endpoints are unreachable.
- Disclosed
- Last updated
- Blast radius
- Any Node.js application that installed dolyame-ui-inputmoney
- Ecosystems
- Attack vectors
- Affected entities
- dolyame-ui-inputmoneynpm package containing malicious code
The npm package dolyame-ui-inputmoney was found to contain malicious code that executes upon package import. The attack chain begins when index.js loads support.js, which fetches platform-specific binaries from Cloudflare Worker hostnames (oob-worker.cf10{1,2,3}-*.workers.dev), writes them to /var/tmp/.cache or Windows Temp as dotnet_diag_.exe, sets executable permissions (0755), and spawns them detached.
The malware implements multiple evasion techniques. String concatenation and splitting are used throughout to obfuscate imports (e.g., require('child_'+'process')) and endpoint construction (e.g., ['oob-worker.cf103-0','70.workers.dev'].join('')). When primary C2 endpoints are unreachable, the code falls back to a DNS TXT covert channel against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, reassembling base64-encoded payloads from chunked TXT records.
A parallel drop-and-execute mechanism is implemented in lib/telemetry.js under an 'analytics SDK' framing, using base64-decoded buffers and child_process.spawn to execute the downloaded binaries. The staging filename (dotnet_diag_.exe) mimics legitimate system tooling to avoid user suspicion. The fetched binaries are unpinned and unverified, allowing arbitrary code execution on affected systems.
This incident was identified and credited to the OpenSSF malicious-packages project.
Indicators of compromise
- Packages
- dolyame-ui-inputmoney
- Domains
- oob-worker.cf101-*.workers.dev
- oob-worker.cf102-*.workers.dev
- oob-worker.cf103-*.workers.dev
- sdk.dl.wel1.ru
- ext.dl.wel1.ru
- pkg.dl.wel1.ru
- net.dl.wel1.ru
Remediation
- Immediately uninstall dolyame-ui-inputmoney from all affected projects
- Audit npm package.json and lock files for any presence of dolyame-ui-inputmoney
- Review process execution logs and network connections for suspicious activity to/from oob-worker.cf10*.workers.dev and *.dl.wel1.ru domains
- Block outbound connections to Cloudflare Workers domains (*.workers.dev) and the identified DNS C2 domains at network perimeter
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Update to a patched version if available, or use an alternative package
Sources
- GitHub Advisory GHSA-h8f3-rr3j-wr6w · GitHub Advisory Database
Cite this entry
"Malicious code in dolyame-ui-inputmoney (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-inputmoney-npm-1i9xis
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