What does the @bhyolken/echotest malware do?

The package @bhyolken/echotest was found to contain malicious code. The OpenSSF Package Analysis project identified '@bhyolken/echotest' @ 1.1.0 (npm) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity. - The package executes one or more commands associated with malicious behavior.

Which versions of @bhyolken/echotest are malicious?

The following npm versions of @bhyolken/echotest are flagged malicious: 1.0.0, 1.1.0, 1.4.0. Treat any of these as compromised.

How do I remediate @bhyolken/echotest if I installed it?

Remove @bhyolken/echotest from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

I already installed @bhyolken/echotest — how do I know if it already compromised me?

If @bhyolken/echotest 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 @bhyolken/echotest part of a known attack campaign?

Yes — @bhyolken/echotest is associated with the RLMA-2025-06012 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 @bhyolken/echotest across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for @bhyolken/echotest (3 malicious versions).

Malicious package

@bhyolken/echotestnpm

Advisory published Dec 3, 2025Updated Dec 23, 2025

@bhyolken/echotest is a confirmed malicious npm package (MAL-2025-192271) that executes malicious code on install (malicious versions 1.0.0, 1.1.0, 1.4.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @bhyolken/echotest (npm)

MAL-2025-192271

Immediate action

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

npm uninstall @bhyolken/echotest

What this malware does

The package @bhyolken/echotest was found to contain malicious code.

The OpenSSF Package Analysis project identified '@bhyolken/echotest' @ 1.1.0 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.
The package executes one or more commands associated with malicious behavior.

Malicious versions

3 flagged

1.0.01.1.01.4.0

Indicators of compromise (SHA-256)

3f892e3f11e25c8e53cb0d01901d0e5f6651888b1d6e29d64da4f0b5b85660eb

1e629126b1c5a4e3de27b1e8fa4c31f43eea17d846723e2d12e5d7d3fce7d2af

6b513e10d4bba263d887f98b6f26951670b1d18386a6044c83c601516030c0c7

a7c1625bb940754fef6e27469a2a638b83d81b106a5ad1fbd36154256876ad95

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for @bhyolken/echotest (3 malicious versions).
If you installed it — respond
Remove @bhyolken/echotest from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If @bhyolken/echotest 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. @bhyolken/echotest on npm has been identified as a malicious package (versions 1.0.0, 1.1.0, 1.4.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2025-06012

Credits

Amazon Inspector · finder
OpenSSF: Package Analysis · finder
ReversingLabs · finder

Detect & block this

O3 blocks @bhyolken/echotest-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

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