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resolvedcritical

Malicious code in adpost (PyPI)

The adpost package on PyPI contained malicious code as part of a campaign by EsqueleSquad group that published nearly 6000 malicious PyPI and NPM packages. The malicious code executed spyware and information-stealing malware.

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Disclosed
Last updated
Blast radius
Unknown; part of large-scale malicious package campaign affecting thousands of packages
Ecosystems
PyPI
Attack vectors
Compromised package
Threat actor
Esquelesquad
Affected entities
  • adpostPyPI package containing malicious code

The adpost package on PyPI was identified as containing malicious code. This package was part of a large-scale campaign by the EsqueleSquad group, which published nearly 6000 malicious packages across PyPI and NPM repositories.\n\nThe malicious code in these packages was designed to execute spyware and information-stealing malware on affected systems. The adpost package was documented in the OpenSSF's malicious-packages repository with identifier MAL-2023-2496.\n\nThis incident represents a significant supply chain attack affecting multiple ecosystems simultaneously, with thousands of packages weaponized for data theft and system compromise.

Indicators of compromise

Packages
  • adpost

Remediation

  • Remove the adpost package from all environments
  • Audit systems that installed adpost for signs of compromise or data exfiltration
  • Review PyPI package dependencies for other packages from the EsqueleSquad campaign
  • Monitor for suspicious network activity or unauthorized data access on affected systems
  • Consult the OpenSSF malicious-packages repository for the complete list of affected packages

Sources

  1. GitHub Advisory GHSA-j7mw-9g9x-9gw9 · GitHub Advisory Database

Cite this entry

"Malicious code in adpost (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-adpost-pypi-f6eu9t

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