Which versions of simple-probe-utils are malicious?

The following npm versions of simple-probe-utils are flagged malicious: 1.0.0, 1.0.1. Treat any of these as compromised.

How do I remediate simple-probe-utils if I installed it?

simple-probe-utils is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed simple-probe-utils — how do I know if it already compromised me?

If simple-probe-utils 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 simple-probe-utils part of a known attack campaign?

Yes — simple-probe-utils is associated with the IN-MAL-2026-010969, IN-MAL-2026-014925 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 simple-probe-utils across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for simple-probe-utils (2 malicious versions).

Malicious package

simple-probe-utilsnpm

Advisory published Jul 28, 2026Updated Aug 5, 2026

simple-probe-utils is a confirmed malicious npm package (MAL-2026-11147) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.0, 1.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in simple-probe-utils (npm)

MAL-2026-11147

Immediate action

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

npm uninstall simple-probe-utils

What this malware does

On npm install, postinstall.js executes shell commands that query cloud instance metadata services (AWS IMDS at 169.254.169.254, plus Tencent, Aliyun, GCP, and Azure endpoints) and extracts the AWS IAM role's temporary security credentials. The captured IAM credentials, hostname, and username are appended as query parameters to an HTTP request to the hardcoded out-of-band host pzs5w7ntzhsnepwk564lyfdci3oucl0a.oastify.com (a Burp Collaborator-style domain). The package.json describes the module as a lightweight string formatting helper; the shipped code contains only the credential-harvesting postinstall, with no string-utility functionality present.

Malicious versions

2 flagged

1.0.01.0.1

Indicators of compromise (SHA-256)

0457a026ab28fbb641d11e4e9ac9d60d026fd77210972f72e6ac931b4b06c59c

31a2caec7bf963e79d504c84f21d9f6ce48b20e44a197c71b28e919f560088d3

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for simple-probe-utils (2 malicious versions).
If you installed it — respond
simple-probe-utils is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If simple-probe-utils 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. simple-probe-utils on npm has been identified as a malicious package (versions 1.0.0, 1.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-010969IN-MAL-2026-014925

References

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks simple-probe-utils-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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