Malicious code in dolyame-ui-memoizeweak (npm)
The npm package dolyame-ui-memoizeweak contained malicious code that downloads and executes platform-specific binaries from hardcoded Cloudflare Workers endpoints and DNS-TXT fallback channels upon require. The package uses obfuscation techniques to evade static analysis and spawns detached processes to execute downloaded payloads.
- Disclosed
- Last updated
- Blast radius
- Any developer or application that installed dolyame-ui-memoizeweak
- Ecosystems
- Attack vectors
- Affected entities
- dolyame-ui-memoizeweaknpm package containing malicious code
The npm package dolyame-ui-memoizeweak was found to contain malicious code that executes upon package import. The malware is distributed across two dropper paths: index.js loads ./_helpers.js, which downloads platform-specific executables from hardcoded Cloudflare Workers endpoints (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev), with DNS-TXT covert-channel fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru.
The fetched binaries are written to temporary directories (/tmp or %TEMP%) under obfuscated names such as dotnet_diag_.exe and .cache_, given execute permissions (chmod 0755), and spawned as detached processes via child_process.spawn(). A second redundant dropper in lib/telemetry.js base64-decodes fetched chunks, writes an 'extension' file, chmods it executable, and spawns /bin/sh on the result.
The malware employs runtime string reassembly and fragmentation to evade static analysis tools, reconstructing hostnames and sensitive API names (e.g., child_process) from split string fragments. The package contains no version pinning, hash verification, or signature validation, and has no legitimate purpose consistent with its declared name (memoizeweak).
Indicators of compromise
- Packages
- dolyame-ui-memoizeweak
- Domains
- oob-worker.cf99-9b3.workers.dev
- oob-worker.cf102-baf.workers.dev
- oob-worker.cf101-adf.workers.dev
- oob-worker.cf100-416.workers.dev
- sdk.dl.wel1.ru
- ext.dl.wel1.ru
- pkg.dl.wel1.ru
- net.dl.wel1.ru
Remediation
- Immediately remove dolyame-ui-memoizeweak from all projects and dependencies
- Audit npm install logs and lock files to identify when the package was installed
- Assume any system that installed this package may be compromised; perform forensic analysis for signs of binary execution
- Block outbound connections to the identified Cloudflare Workers domains and DNS domains (oob-worker.cf*.workers.dev, sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru)
- Review npm audit logs and consider rotating any credentials or secrets that may have been exposed
- Update npm dependencies and use npm ci with a clean lock file to restore a known-good state
Sources
- GitHub Advisory GHSA-453m-cmgf-pp2m · GitHub Advisory Database
Cite this entry
"Malicious code in dolyame-ui-memoizeweak (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-memoizeweak-npm-ksvaj8
Suggest a correction
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