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supplychainattack.orgSupply chain attack incident catalog
resolvedcritical

Malicious code in yfiinance (PyPI)

Attacker distributed 900+ malicious packages via PyPI, including yfiinance, which installed malicious browser extensions designed to manipulate clipboard contents and replace cryptocurrency wallet addresses. The campaign was identified and documented by the OpenSSF malicious-packages project.

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

A large-scale malicious package campaign distributed over 900 compromised packages through the Python Package Index (PyPI). The yfiinance package was among those affected by this attack.\n\nThe malicious packages installed browser extensions that performed clipboard manipulation and cryptocurrency wallet address replacement attacks. This technique allowed attackers to intercept and modify cryptocurrency transactions by replacing legitimate wallet addresses with attacker-controlled addresses when users copied and pasted them.\n\nThe campaign was identified and tracked by the OpenSSF's malicious-packages project (MAL-2023-2449). The incident demonstrates the risk of typosquatting and compromised packages in public package repositories targeting cryptocurrency users.

Indicators of compromise

Packages
  • yfiinance

Remediation

  • Immediately uninstall yfiinance and any other suspicious packages from affected systems
  • Audit PyPI package installations for the 900+ malicious packages identified in this campaign
  • Review browser extensions installed on systems that ran the malicious packages and remove any suspicious extensions
  • For cryptocurrency users: verify all recent wallet addresses used in transactions and check for unauthorized transfers
  • Implement package verification and scanning in dependency management workflows
  • Monitor PyPI for similar typosquatting or malicious package campaigns

Sources

  1. GitHub Advisory GHSA-2mf9-gv38-xrpv · GitHub Advisory Database

Cite this entry

"Malicious code in yfiinance (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yfiinance-pypi-1sj4lw

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