Malicious code in devplatform-eslint-config (npm)
devplatform-eslint-config@35.8.9 on npm contained malicious code that downloads and executes a native binary from attacker-controlled infrastructure. The package masquerades as an ESLint configuration but ships no legitimate ESLint code.
- Disclosed
- Last updated
- Blast radius
- Any developer or system that installed devplatform-eslint-config@35.8.9 and required the package would execute the malicious payload.
- Ecosystems
- Attack vectors
- Affected entities
- devplatform-eslint-config · 35.8.9
devplatform-eslint-config@35.8.9 is a malicious npm package that does not provide the ESLint configuration it claims to offer. Upon import, the package loads compat.js, which selects a payload path based on the target OS and architecture (linux_x64, linux_arm64, darwin, win32).\n\nThe malicious code fetches an opaque native binary over HTTPS from rotating Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev). The C2 hostnames are assembled at runtime from split string fragments to evade static analysis. A DNS-TXT covert-channel fallback reassembles base64-encoded chunks from TXT records under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru.\n\nThe fetched binary is written to a temporary path with a decoy filename (e.g., dotnet_diag.exe, .cache_), given execute permissions (chmod 0755), and executed via a detached child process. lib/telemetry.js contains duplicate fetch-write-chmod-spawn primitives. The package identity as an ESLint configuration is a cover story unrelated to the actual malicious payload.\n\nThe incident was identified and credited to the OpenSSF malicious-packages repository.
Indicators of compromise
- Packages
- devplatform-eslint-config
- Domains
- oob-worker.cf102-baf.workers.dev
- oob-worker.cf103-070.workers.dev
- oob-worker.cf99-9b3.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 uninstall devplatform-eslint-config@35.8.9 from all systems and projects
- Audit npm install logs and dependency trees to identify all systems that may have installed this package
- Review process execution logs on affected systems for suspicious child processes spawned by Node.js
- Check for outbound HTTPS connections to the listed Cloudflare Workers domains and DNS queries to wel1.ru subdomains
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Update npm lockfiles and reinstall dependencies from a clean state
- Monitor for indicators of compromise from the downloaded and executed binaries
Sources
- GitHub Advisory GHSA-jj9v-qmgp-c65m · GitHub Advisory Database
Cite this entry
"Malicious code in devplatform-eslint-config (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 7, 2026; last updated August 7, 2026. https://supplychainattack.org/incident/malicious-code-in-devplatform-eslint-config-npm-1sc1co
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