Malicious code in ded-pwa-c-page-maker-props (npm)
The npm package ded-pwa-c-page-maker-props contained malicious code that, upon installation, fetches and executes unsigned binaries from attacker-controlled Cloudflare Workers endpoints or via DNS-TXT covert channels. The package falsely advertised PWA functionality but performed only malicious payload delivery.
- Disclosed
- Last updated
- Blast radius
- Any developer or system that installed the malicious npm package during its availability.
- Ecosystems
- Attack vectors
- Affected entities
- ded-pwa-c-page-maker-propsnpm package containing malicious code that fetches and executes unsigned binaries on installation
The npm package ded-pwa-c-page-maker-props was found to contain malicious code that executes on package installation. Upon require, the compat.js module selects a platform-specific endpoint and fetches an opaque binary from obfuscated Cloudflare Workers hosts (oob-worker.cf101/cf102/cf103-*.workers.dev, cf99-9b3.workers.dev), writing it to /tmp/.cache on POSIX systems or %TEMP%\dotnet_diag_.exe on Windows, then executing it with elevated permissions.
The malicious code uses string obfuscation to hide destination hostnames and filenames, assembling them from split arrays at runtime. It checks environment variables (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) as a cover story to gate the binary drop. If the HTTPS fetch fails, the code falls back to a DNS-TXT covert channel, querying c.*.dl.wel1.ru for chunk counts and reassembling a base64-encoded binary payload from sequential TXT records at sdk/ext/pkg/net.dl.wel1.ru.
The package advertised itself as a PWA props module but shipped no such functionality. Its sole effect at install/import time was fetching and executing an unsigned attacker binary on the installer's machine. The incident was identified by Amazon Inspector and credited to the OpenSSF malicious-packages repository."
Indicators of compromise
- Packages
- ded-pwa-c-page-maker-props
- Domains
- oob-worker.cf101.workers.dev
- oob-worker.cf102.workers.dev
- oob-worker.cf103.workers.dev
- cf99-9b3.workers.dev
- dl.wel1.ru
Remediation
- Review the linked advisory; remove or upgrade the affected component and rotate any exposed credentials.
Sources
- GitHub Advisory GHSA-cf34-h47q-47m7 · GitHub Advisory Database
Cite this entry
"Malicious code in ded-pwa-c-page-maker-props (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-c-page-maker-props-npm-cwvstu
Suggest a correction
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