Malicious code in ded-pwa-bnpl-forms-test-demo (npm)
The npm package ded-pwa-bnpl-forms-test-demo contained malicious code that downloads and executes attacker-controlled platform-specific binaries from Cloudflare Workers endpoints upon require(). The dropper executes arbitrary native code on the host system with no verification or publisher control.
- Disclosed
- Last updated
- Blast radius
- Any developer or system that installed and required the ded-pwa-bnpl-forms-test-demo package would execute attacker-controlled native code at require() time.
- Ecosystems
- Attack vectors
- Affected entities
- ded-pwa-bnpl-forms-test-demonpm package containing malicious code in index.js and _helpers.js
The npm package ded-pwa-bnpl-forms-test-demo was found to contain malicious code in its index.js and helpers.js files. Upon require() of the package, the code downloads platform-specific binaries from attacker-controlled Cloudflare Workers endpoints (oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT fallback to *.dl.wel1.ru.\n\nThe destination hostnames are obfuscated via array.join('') string-splitting to evade static scanning. The fetched payload is written to temporary directories (/tmp or %TEMP%) under disguised filenames (.cache on Unix, dotnet_diag_.exe on Windows), made executable (chmod 0755), and spawned detached via shell commands. There is no hash or signature verification of the downloaded binaries, and the destinations are not publisher-controlled.\n\nThe malicious code is reachable at import time, meaning a plain npm install followed by any require() of the package executes attacker-controlled native code on the installer's host. An opt-out mechanism is disguised as a generic DISABLE_TELEMETRY environment variable.\n\nThe incident was identified by the OpenSSF malicious-packages project and published via GitHub Security Advisory GHSA-p8rx-fwf3-42m7.
Indicators of compromise
- Packages
- ded-pwa-bnpl-forms-test-demo
- Domains
- oob-worker.cf99-9b3.workers.dev
- oob-worker.cf103-070.workers.dev
- oob-worker.cf102-baf.workers.dev
- dl.wel1.ru
Remediation
- Remove the ded-pwa-bnpl-forms-test-demo package from all projects immediately
- Audit npm install logs and package-lock.json files to identify systems that may have installed this package
- Scan affected systems for suspicious processes spawned from /tmp or %TEMP% directories with disguised filenames
- Review system logs for unexpected outbound connections to oob-worker.cf*.workers.dev or *.dl.wel1.ru domains
- If the package was installed, assume the host may be compromised and perform forensic analysis or rebuild affected systems
- Use npm audit to check for this malicious package in dependency trees
Sources
- GitHub Advisory GHSA-p8rx-fwf3-42m7 · GitHub Advisory Database
Cite this entry
"Malicious code in ded-pwa-bnpl-forms-test-demo (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 7, 2026; last updated August 7, 2026. https://supplychainattack.org/incident/malicious-code-in-ded-pwa-bnpl-forms-test-demo-npm-144axb
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