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Identifies fake PyPI Packages.

yara LOW Yara-Rules
community
This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at Yara-Rules →
Retrieved: 2026-06-28T23:00:00Z · Confidence: medium

Hunt Hypothesis

This detection rule identifies adversaries attempting to compromise Python supply chains by distributing malicious or counterfeit packages on the PyPI repository. Proactively hunting for these anomalies in Azure Sentinel is critical to prevent the installation of compromised dependencies that could serve as an initial foothold for lateral movement and code execution within the organization’s cloud infrastructure.

YARA Rule

rule MALW_FakePyPI
{
meta:
	description = "Identifies fake PyPI Packages."
	author = "@bartblaze"
	reference = "http://www.nbu.gov.sk/skcsirt-sa-20170909-pypi/"
	date = "2017-09"
	tlp = "white"

strings:	
	$ = "# Welcome Here! :)"
	$ = "# just toy, no harm :)"
	$ = "[0x76,0x21,0xfe,0xcc,0xee]"

condition:
	all of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

References

False Positive Guidance

Here are 4 specific false positive scenarios for the “Identifies fake PyPI Packages” detection rule, tailored for a legitimate enterprise environment:

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/MALW_PyPI.yar