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resolvedcritical

Malicious code in ypinstaller (PyPI)

Attacker distributed 900+ malicious packages via PyPI, including ypinstaller, which installed malicious browser extensions designed to manipulate clipboard contents and replace cryptocurrency wallet addresses.

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Disclosed
Last updated
Blast radius
900+ malicious packages distributed via PyPI
Ecosystems
PyPI
Attack vectors
Compromised package
Affected entities
  • ypinstallerPyPI package

An attacker distributed over 900 malicious packages via the Python Package Index (PyPI), including the package ypinstaller. These packages contained code that installed malicious browser extensions on infected systems.\n\nThe malicious extensions were designed to intercept and manipulate clipboard data, specifically targeting cryptocurrency wallet addresses. When users copied wallet addresses, the extension would replace them with attacker-controlled addresses, enabling theft of cryptocurrency transfers.\n\nThe incident was documented by the OpenSSF's malicious-packages repository and attributed to Checkmarx research. The packages have since been removed from PyPI.

Indicators of compromise

Packages
  • ypinstaller

Remediation

  • Remove ypinstaller and any other suspicious packages from affected systems
  • Audit installed browser extensions and remove any unknown or suspicious extensions
  • Review recent clipboard activity and cryptocurrency transactions for signs of address replacement
  • Check PyPI package installation logs for ypinstaller or related packages from the 900+ malicious package campaign
  • Use only verified and well-maintained packages from trusted sources
  • Enable package signature verification where available

Sources

  1. GitHub Advisory GHSA-m458-8r93-f7q6 · GitHub Advisory Database

Cite this entry

"Malicious code in ypinstaller (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-ypinstaller-pypi-br6vrn

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