Which versions of rc4-secure are malicious?

The following PyPI versions of rc4-secure are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate rc4-secure if I installed it?

rc4-secure 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 rc4-secure — how do I know if it already compromised me?

If rc4-secure was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is rc4-secure part of a known attack campaign?

Yes — rc4-secure is associated with the 2026-08-rc4-secure 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 rc4-secure across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for rc4-secure (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging rc4-secure across your stack and pipelines.

Malicious package

rc4-securePyPI

rc4-secure is a confirmed malicious PyPI package (MAL-2026-14306) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in rc4-secure (PyPI)

MAL-2026-14306

Immediate action

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

pip uninstall rc4-secure

What this malware does

Package silently installs a remote executable in a way that is intentionally hidden from the user. During analysis, the code was downloading a legitimate software unrelated to provided functionality, suggesting it is a research-like demonstration.

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-08-rc4-secure

Reasons (based on the campaign):

Downloads and executes a remote executable.
modify-system-without-consent
action-hidden-in-lib-usage

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

c00d4194b32151e318678fb20166e9023d74acbed43e4a9d82f7834569cb73bd

Detection & response playbook

Credential / info stealer

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for rc4-secure (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging rc4-secure across your stack and pipelines.
If you installed it — respond
rc4-secure 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 rc4-secure was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks rc4-secure before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. rc4-secure on PyPI 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

2026-08-rc4-secure

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks rc4-secure-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

All malware advisories How O3 detects malware Vulnerability database