What does the tetotest malware do?

package.json declares preinstall and postinstall lifecycle scripts that invoke wget to POST the installer's shell-expanded working directory ($(pwd)) and machine hostname ($(hostname)) to a hardcoded Discord webhook at https://discord.com/api/webhooks/1413937656697720862/ . Both hooks fire automatically on `npm install` without user interaction. The package ships no library code or documented functionality — its sole effect is beaconing installer host identifiers to an attacker-controlled Discord endpoint.

Which versions of tetotest are malicious?

The following npm versions of tetotest are flagged malicious: 14.0.0. Treat any of these as compromised.

How do I remediate tetotest if I installed it?

tetotest 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 tetotest — how do I know if it already compromised me?

If tetotest 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 tetotest part of a known attack campaign?

Yes — tetotest is associated with the IN-MAL-2026-020085 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 tetotest across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for tetotest (version 14.0.0).

Malicious package

tetotestnpm

Advisory published Sep 16, 2026Updated Sep 16, 2026

tetotest is a confirmed malicious npm package (MAL-2026-16217) that opens a backdoor for remote access (malicious version 14.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in tetotest (npm)

MAL-2026-16217

Immediate action

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

npm uninstall tetotest

What this malware does

package.json declares preinstall and postinstall lifecycle scripts that invoke wget to POST the installer's shell-expanded working directory ($(pwd)) and machine hostname ($(hostname)) to a hardcoded Discord webhook at https://discord.com/api/webhooks/1413937656697720862/<redacted>. Both hooks fire automatically on npm install without user interaction. The package ships no library code or documented functionality — its sole effect is beaconing installer host identifiers to an attacker-controlled Discord endpoint.

Malicious versions

1 flagged

14.0.0

Indicators of compromise (SHA-256)

b181542b0c55a472e316ca973cc5b1deaf31986645fd326903e8c31ab20acab6

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for tetotest (version 14.0.0).
If you installed it — respond
tetotest 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 tetotest 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. tetotest on npm has been identified as a malicious package (version 14.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020085

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks tetotest-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

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