ronyfortestnpm
Advisory published Updated
ronyfortest is a confirmed malicious npm package (MAL-2026-7002) that opens a backdoor for remote access (malicious version 99.9.9). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in ronyfortest (npm)
What this malware does
The package's postinstall hook (node index.js) runs automatically on npm install and collects the installer's OS username (os.userInfo().username), hostname (os.hostname()), and working directory (process.env.INIT_CWD || process.cwd()), then POSTs them as JSON to a hardcoded webhook.site inspector URL (https://webhook.site/49781ccd-e409-4a90-8a42-34ed52b9e7b1). package.json ships empty author/description/keywords metadata and declares no legitimate purpose. The behavior is an unconditional install-time beacon that leaks installer host/user identifiers to an author-controlled inspection endpoint.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Backdoor / remote accessFind it
Search your lockfiles and build artifacts for ronyfortest (version 99.9.9).
If you installed it — respond
ronyfortest establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If ronyfortest was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks ronyfortest-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.