Malicious code in statist-browser-typed-client-nfs.grocery.mobile.events (npm)
The npm package statist-browser-typed-client-nfs.grocery.mobile.events contained malicious code that acts as a dropper, fetching and executing platform-specific payloads from remote servers upon require(). The package uses obfuscation and covert channels to evade detection.
- Disclosed
- Last updated
- Blast radius
- Any system that installed and required the malicious npm package; cross-platform (Linux, Windows, macOS)
- Ecosystems
- Attack vectors
- Affected entities
- statist-browser-typed-client-nfs.grocery.mobile.eventsnpm package containing malicious dropper code
The npm package statist-browser-typed-client-nfs.grocery.mobile.events was found to contain malicious code that executes on package import. The main entry point (index.js) loads a platform-specific payload selector (_platform.js) that fetches opaque executable bytes from three anonymous Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev).
If the primary Cloudflare Workers hosts are unavailable, the malware falls back to a covert DNS TXT record exfiltration channel using subdomains under *.dl.well1.site (tin, tina, ldr, win). The fetched payloads are written to temporary directories (/var/tmp on Unix, %TEMP% on Windows) under disguised filenames (.cache_, dotnet_diag_.exe) with executable permissions, then spawned detached via shell commands.
The malware employs multiple obfuscation techniques to evade static analysis: destination hostnames and DNS domains are assembled at runtime from split string fragments (e.g., ["oob-w","orker.cf102-","baf.workers.de","v"].join("")), and stderr is silenced via a no-op logger. A sibling module (lib/telemetry.js, 81 KB) contains duplicate drop-and-exec primitives with concatenation-obfuscated API names. Marker files and environment variables (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) are used as cover stories, but the actual behavior is unconditional dropper execution.
The package was identified via Amazon Inspector and reported through GitHub Security Advisories (GHSA-3225-grxw-fx69).
Indicators of compromise
- Packages
- statist-browser-typed-client-nfs.grocery.mobile.events
- Domains
- oob-worker.cf103-070.workers.dev
- oob-worker.cf102-baf.workers.dev
- oob-worker.cf99-9b3.workers.dev
- dl.well1.site
Remediation
- Immediately uninstall the package: npm uninstall statist-browser-typed-client-nfs.grocery.mobile.events
- Audit all systems where this package was installed for signs of unauthorized executable files in /var/tmp, %TEMP%, or other temporary directories
- Review process execution logs for spawned shell commands or detached processes originating from Node.js
- Block outbound connections to the identified Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) and DNS queries to *.dl.well1.site
- Check npm audit logs and dependency trees for any projects that may have installed this package
- If the package was used in production, treat affected systems as potentially compromised and perform forensic analysis
Sources
- GitHub Advisory GHSA-3225-grxw-fx69 · GitHub Advisory Database
Cite this entry
"Malicious code in statist-browser-typed-client-nfs.grocery.mobile.events (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 5, 2026; last updated August 5, 2026. https://supplychainattack.org/incident/malicious-code-in-statist-browser-typed-client-nfs-grocery-mobile-events-npm-1y340m
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