Which versions of sheratan_test_p are malicious?

The following npm versions of sheratan_test_p are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate sheratan_test_p if I installed it?

Remove sheratan_test_p 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 network activity or persistence. Use O3 Security's dependency scanner to confirm the package and its artifacts are fully purged across your stack.

Is sheratan_test_p part of a known attack campaign?

Yes — sheratan_test_p is associated with the IN-MAL-2026-006877 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

Can O3 Security detect sheratan_test_p in my codebase?

Yes. O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, blocking sheratan_test_p and packages like it before any post-install script runs.

Malicious package

sheratan_test_pnpm

Malicious code in sheratan_test_p (npm) Remove it immediately and rotate any exposed credentials.

MAL-2026-5993

Immediate action

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

npm uninstall sheratan_test_p

What this malware does

On npm install, the package's postinstall.js executes whoami via child_process and POSTs the output (along with stderr, error, and a timestamp) to a hardcoded webhook.site collector URL. The package self-describes as 'A simple date formatting utility' and contains no code matching that purpose; the only behavior on install is the host-identity beacon. Package metadata is consistent with a throwaway exfiltration artifact (placeholder name sheratan_test_p, empty author, generic description). Any developer or CI runner installing this package leaks their user/host context to an attacker-controlled third-party collector.

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

472354ac3cd0bba5d399eea2f09e4b7f60cb2cb65e20d4af0f6398882403f566

Frequently asked questions

No. sheratan_test_p on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-006877

References

npmjs.com

Credits

Amazon Inspector · finder

Scan your dependencies

O3 Security blocks malicious packages like this at install time and in CI.

Supply-chain protection