Malicious code in yfiannce (PyPI)
Attacker distributed 900+ malicious packages via PyPI, including yfiannce, which installed malicious browser extensions designed to manipulate clipboard and replace cryptocurrency wallet addresses.
- Disclosed
- Last updated
- Blast radius
- 900+ malicious packages distributed via PyPI
- Ecosystems
- Attack vectors
- Affected entities
- yfianncePyPI package
A large-scale malicious package campaign distributed over 900 compromised packages via PyPI. The yfiannce package was among those affected, containing code that installed malicious browser extensions on infected systems.\n\nThe malicious extensions were designed to intercept and manipulate clipboard contents, specifically targeting cryptocurrency wallet addresses. This allowed attackers to redirect cryptocurrency transactions to attacker-controlled wallets when users attempted to paste wallet addresses.\n\nThe incident was identified and documented by Checkmarx and credited to the OpenSSF malicious-packages repository, which tracks such supply chain attacks.
Indicators of compromise
- Packages
- yfiannce
Remediation
- Immediately uninstall yfiannce and any other packages from the 900+ malicious package campaign
- Scan systems for malicious browser extensions, particularly those affecting clipboard functionality
- Review browser extension permissions and remove any suspicious extensions
- Audit cryptocurrency wallet transactions for unauthorized activity
- Check PyPI package dependencies to identify if yfiannce or related packages were installed as transitive dependencies
- Monitor for signs of clipboard manipulation or unexpected wallet address changes
Sources
- GitHub Advisory GHSA-598g-ph32-mwp8 · GitHub Advisory Database
Cite this entry
"Malicious code in yfiannce (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yfiannce-pypi-1wyv5b
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