Skip to content
supplychainattack.orgSupply chain attack incident catalog
resolvedcritical

Malicious code in adsplit (PyPI)

The adsplit package on PyPI contained malicious code that executed spyware and information-stealing malware. It was part of a campaign by EsqueleSquad group that published nearly 6,000 malicious PyPI and NPM packages.

ShareXLinkedInHacker News
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
  • adsplitPyPI package containing malicious code

The adsplit package published on PyPI contained malicious code designed to execute spyware and information-stealing malware on affected systems. This package was part of a large-scale coordinated campaign by the EsqueleSquad group.\n\nThe EsqueleSquad group published nearly 6,000 malicious packages across PyPI and NPM ecosystems as part of this campaign. The malicious packages were identified and documented by the OpenSSF (Open Source Security Foundation) in their malicious-packages repository.\n\nThe incident was discovered and reported through Checkmarx and credited to the OpenSSF's malicious-packages project, which maintains a catalog of known malicious open-source packages.

Indicators of compromise

Packages
  • adsplit

Remediation

  • Remove adsplit from all environments and dependencies
  • Audit systems that may have installed adsplit for signs of compromise or data exfiltration
  • Review and revoke any credentials or sensitive data that may have been exposed
  • Monitor for indicators of compromise related to spyware or information-stealing malware
  • Check the OpenSSF malicious-packages repository for the complete list of affected packages in this campaign and remove them

Sources

  1. GitHub Advisory GHSA-h854-7239-h45h · GitHub Advisory Database

Cite this entry

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

Suggest a correction

Found an error or have a newer source? Corrections to factual errors take priority over new entries.

Related incidents

  1. resolvedcritical

    Malicious code in afrit-name (PyPI)

    Malicious code was discovered in the afrit-name package on PyPI. The incident was identified and documented by the OpenSSF malicious packages project.

    PyPICompromised package
  2. resolvedcritical

    Malicious code in adv2099m7 (PyPI)

    Malicious code was discovered in the adv2099m7 package on PyPI. The package was identified and cataloged by the OpenSSF malicious packages project.

    PyPICompromised package
  3. resolvedcritical

    Malicious code in adrandom (PyPI)

    The adrandom package on PyPI contained malicious code that executed spyware and information-stealing malware. It was part of a campaign by the EsqueleSquad group that published nearly 6,000 malicious packages across PyPI and NPM.

    EsquelesquadPyPICompromised package
  4. resolvedcritical

    Malicious code in ziphash (PyPI)

    The ziphash package on PyPI contained malicious code that downloads and executes multi-stage malware during archive-support class initialization. The malware exhibits obfuscation and remote code execution capabilities, classified as part of the 2025-11-uzip campaign.

    2025 11 UzipPyPICompromised package