Which versions of estore-client are malicious?

The following npm versions of estore-client are flagged malicious: 5.0.0. Treat any of these as compromised.

How do I remediate estore-client if I installed it?

estore-client 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 estore-client — how do I know if it already compromised me?

If estore-client 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 estore-client part of a known attack campaign?

Yes — estore-client is associated with the IN-MAL-2026-010613 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 estore-client across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for estore-client (version 5.0.0).

Malicious package

estore-clientnpm

Advisory published Jul 15, 2026Updated Jul 15, 2026

estore-client is a confirmed malicious npm package (MAL-2026-10634) that opens a backdoor for remote access (malicious version 5.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in estore-client (npm)

MAL-2026-10634

Immediate action

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

npm uninstall estore-client

What this malware does

package.json declares a preinstall lifecycle script that runs wget against https://webhook.site/d32804ac-1bbb-4100-ab60-95231dd3251c/, sending the installer's OS username ($(whoami)), current working directory ($(pwd)), and hostname ($(hostname)) as query parameters. This fires automatically on npm install before any user code runs. webhook.site is an anonymous request-collector service; the destination is not associated with a legitimate publisher endpoint. The behavior is host reconnaissance / beaconing consistent with a supply-chain recon stage.

Malicious versions

1 flagged

5.0.0

Indicators of compromise (SHA-256)

6f5f2a664c7576b3cbf04696ddff717d8b3e9b835693035fa56a23035edef411

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for estore-client (version 5.0.0).
If you installed it — respond
estore-client 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 estore-client 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. estore-client on npm has been identified as a malicious package (version 5.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-010613

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks estore-client-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

All malware advisories How O3 detects malware Vulnerability database