Which versions of keroeltopkk are malicious?

The following npm versions of keroeltopkk are flagged malicious: 99.99.99. Treat any of these as compromised.

How do I remediate keroeltopkk if I installed it?

keroeltopkk 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.

I already installed keroeltopkk — how do I know if it already compromised me?

If keroeltopkk 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.

Is keroeltopkk part of a known attack campaign?

Yes — keroeltopkk is associated with the IN-MAL-2026-020239 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find keroeltopkk across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for keroeltopkk (version 99.99.99).

Malicious package

keroeltopkknpm

Advisory published Sep 21, 2026Updated Sep 21, 2026

keroeltopkk is a confirmed malicious npm package (MAL-2026-16335) that opens a backdoor for remote access (malicious version 99.99.99). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in keroeltopkk (npm)

MAL-2026-16335

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall keroeltopkk

What this malware does

Package [email protected] ships only a manifest and a beacon script (server.js) and wires it into every npm lifecycle hook (preinstall/install/postinstall/prepare), so npm install auto-executes it. server.js reads os.hostname() and issues an HTTPS GET to https://eo8f3m3ho26a0nm.m.pipedream.net/${packageName}?h=${hostname}, a Pipedream request-bin acting as an attacker-controlled collector. The package version 99.99.99, empty description, absence of any real functionality, and duplicated Dependencies/dependencies keys are consistent with a dependency-confusion reconnaissance squat: the attacker publishes a high-version stub under a name that may match an internal/private package so that misconfigured resolvers pull the public stub and beacon the victim's hostname back on install.

Malicious versions

1 flagged

99.99.99

Indicators of compromise (SHA-256)

b1d7044c35cb0fb76dd0639af395bd8ca87df9981a8c73bb812b9f338e8d5cdc

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for keroeltopkk (version 99.99.99).
If you installed it — respond
keroeltopkk 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 keroeltopkk 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

No. keroeltopkk on npm has been identified as a malicious package (version 99.99.99 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020239

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks keroeltopkk-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Malware detection Runtime egress monitoring

Explore

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