Malware in vybscan-testbed-obfuscated-postinstall
The npm package vybscan-testbed-obfuscated-postinstall contains malware that grants full system compromise to an outside entity. Any computer with this package installed should be considered fully compromised and all secrets and keys rotated immediately from a different machine.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- vybscan-testbed-obfuscated-postinstall
The npm package vybscan-testbed-obfuscated-postinstall has been identified as containing malware. According to the GitHub Advisory (GHSA-43r2-4jr2-rhjf), any computer that has this package installed or running should be considered fully compromised.\n\nThe advisory recommends that all secrets and keys stored on affected computers be rotated immediately from a different, uncompromised computer. While the package should be removed, there is no guarantee that removal will eliminate all malicious software that may have been installed as a result of the package installation, given that the outside entity may have gained full control of the system.\n\nThe malware appears to be delivered via a post-install script, as indicated by the package name suffix "postinstall."
Indicators of compromise
- Packages
- vybscan-testbed-obfuscated-postinstall
Remediation
- Immediately isolate any computer with vybscan-testbed-obfuscated-postinstall installed from the network
- From a different, uncompromised computer, rotate all secrets, keys, and credentials that may have been stored on affected systems
- Remove the vybscan-testbed-obfuscated-postinstall package from all affected systems
- Perform a full forensic analysis and malware scan on affected systems
- Consider full system reimaging if the scope of compromise cannot be determined
- Review all access logs and audit trails on affected systems for unauthorized activity
Sources
- GitHub Advisory GHSA-43r2-4jr2-rhjf · GitHub Advisory Database
Cite this entry
"Malware in vybscan-testbed-obfuscated-postinstall." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 20, 2026; last updated July 20, 2026. https://supplychainattack.org/incident/malware-in-vybscan-testbed-obfuscated-postinstall-z7qdr6
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