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Malicious package

gt-tester-exp-profiler-exp-00000015PyPI

Advisory published Updated

gt-tester-exp-profiler-exp-00000015 is a confirmed malicious PyPI package (MAL-2026-4752) that opens a backdoor for remote access (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in gt-tester-exp-profiler-exp-00000015 (PyPI)

MAL-2026-4752
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
pip uninstall gt-tester-exp-profiler-exp-00000015

What this malware does

setup.py installs a.pth file containing import gt_tester_exp_profiler_exp_00000015.probe; probe.run_probe(), causing every Python interpreter start on the installer's machine to execute the package's probe module. The probe issues a plaintext HTTP GET to http://104.131.173.16/exp-<tag>-<hash16>, leaking the installer's source IP, interpreter-launch cadence, and a per-call hash to a hardcoded third-party host with no opt-in. Because.pth files auto-execute on every python invocation (not only when the package is imported), this constitutes installer-side persistence: the beacon fires for unrelated Python processes long after the user has forgotten the package is installed. The destination is a bare IPv4 address over cleartext HTTP with no integrity verification, so any future operator of that IP — or any on-path attacker — can serve arbitrary responses to the beacon. The User-Agent only references an opt-OUT URL, confirming the author knew consent was absent.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

55fc219f03cbaeeedb660ad423cc7af08ff1d29154c8b8989b7b0c5d7d5c3d75

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for gt-tester-exp-profiler-exp-00000015 (version 1.0.0).

  2. If you installed it — respond

    gt-tester-exp-profiler-exp-00000015 establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

  3. Did it already run?

    If gt-tester-exp-profiler-exp-00000015 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. gt-tester-exp-profiler-exp-00000015 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

IN-MAL-2026-004170

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks gt-tester-exp-profiler-exp-00000015-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Malware detection Runtime egress monitoring

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gt-tester-exp-profiler-exp-00000015 (PyPI) malicious package — MAL-2026-4752 | O3 Security