Malicious code in delivery-ci-core (npm)
The npm package delivery-ci-core contained malicious code that automatically executes attacker-controlled native binaries on installation or import. The malware downloads platform-specific executables from Cloudflare Workers or DNS TXT records and executes them with no user interaction required.
- Disclosed
- Last updated
- Blast radius
- Any system installing or importing the malicious delivery-ci-core package; execution occurs automatically on require/import with no user interaction required.
- Ecosystems
- Attack vectors
- Affected entities
- delivery-ci-corenpm package containing malicious code in index.js and lib/telemetry.js
The npm package delivery-ci-core was found to contain malicious code designed to execute arbitrary native binaries on the host system. Upon require or import, the package's index.js unconditionally loads setup.js, which assembles three Cloudflare Workers hostnames (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev) from obfuscated string arrays.\n\nThe malware downloads platform-specific native binaries and writes them to temporary directories (/tmp or %TEMP%) under decoy filenames (.cache_, dotnet_diag_.exe), sets executable permissions (chmod 0755), and spawns them detached via shell commands (/bin/sh -c or cmd.exe /c start). A parallel execution pipeline is implemented in lib/telemetry.js (81KB), disguised as an analytics SDK, using the same drop-and-execute mechanism.\n\nDangerous API calls and module names are obfuscated through string splitting (e.g., require("child_"+"process"), fs["chmod"+"Sync"]) to evade static code inspection. Installation or import of this package results in execution of attacker-controlled code with no user interaction beyond the require statement. The malware includes a DNS TXT-record fallback under *.dl.wel1.ru for payload reassembly.\n\nThis incident was identified and credited to the OpenSSF malicious-packages project.
Indicators of compromise
- Domains
- oob-worker.cf102-baf.workers.dev
- oob-worker.cf99-9b3.workers.dev
- oob-worker.cf100-416.workers.dev
- *.dl.wel1.ru
Remediation
- Immediately uninstall delivery-ci-core from all systems and projects
- Audit npm package.json and lock files for any presence of delivery-ci-core
- Review system logs and process execution history on any machine where this package was installed or imported
- Scan affected systems for suspicious processes or binaries in /tmp, %TEMP%, or other temporary directories
- Check for network connections to the identified Cloudflare Workers domains and *.dl.wel1.ru
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Update to a safe version if a legitimate replacement package is available, or use an alternative package
Sources
- GitHub Advisory GHSA-r39v-6pf9-cfh8 · GitHub Advisory Database
Cite this entry
"Malicious code in delivery-ci-core (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 7, 2026; last updated August 7, 2026. https://supplychainattack.org/incident/malicious-code-in-delivery-ci-core-npm-dt2g97
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