Which versions of calcnotepad are malicious?

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

How do I remediate calcnotepad if I installed it?

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

If calcnotepad 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 calcnotepad part of a known attack campaign?

Yes — calcnotepad is associated with the 2023-12-valuent 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 calcnotepad 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 calcnotepad (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 calcnotepad across your stack and pipelines.

Malicious package

calcnotepadPyPI

Malicious code in calcnotepad (PyPI) Remove it immediately and rotate any exposed credentials.

MAL-2024-12227

Immediate action

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

pip uninstall calcnotepad

What this malware does

Packages either test the malicious behaviour, or actually download and run a simple remote script during the installation.

Category: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.

Campaign: 2023-12-valuent

Reasons (based on the campaign):

The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
The package overrides the install command in setup.py to execute malicious code during installation.
Downloads and executes a remote malicious script.

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

e2dc7a87e45ce7d2762fad7dfdcd6357ca0224acf7be608a87afc2121cc420ae

84ad749380bb774a5cc7da818c03f863ee2838773e46e0a5c4cff469e1647962

d878adfaeb7d5231857f37f5b0e599c396c8202a3bf6152223f3157e02e38a19

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 calcnotepad (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 calcnotepad across your stack and pipelines.
If you installed it — respond
calcnotepad 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 calcnotepad 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 calcnotepad 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. calcnotepad 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

2023-12-valuent

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193)

Detect & block this

O3 blocks calcnotepad-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