Malware in moustick
Malware was discovered in the npm package moustick, resulting in full system compromise for any installation. The package should be removed immediately and all secrets and keys rotated from a different computer.
- Disclosed
- Last updated
- Blast radius
- Any system with moustick installed or running
- Ecosystems
- Attack vectors
- Affected entities
- moustick
A critical malware incident was identified in the npm package moustick. According to the GitHub Advisory (GHSA-979m-vm48-369f), any computer with this package installed or running should be considered fully compromised.\n\nThe advisory recommends immediate action: all secrets and keys stored on affected computers should be rotated from a different, uncompromised system. 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 initial compromise, as the attacker may have gained full control of the system.\n\nThis represents a critical supply chain attack through a malicious package distribution.
Indicators of compromise
- Packages
- moustick
Remediation
- Immediately remove the moustick package from all systems
- Rotate all secrets, API keys, and credentials from a different, uncompromised computer
- Assume full system compromise and conduct forensic analysis
- Monitor affected systems for signs of persistent malware or backdoors
- Review system logs for unauthorized access or modifications during the period the package was installed
Sources
- GitHub Advisory GHSA-979m-vm48-369f · GitHub Advisory Database
Cite this entry
"Malware in moustick." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 9, 2026; last updated June 9, 2026. https://supplychainattack.org/incident/malware-in-moustick-1sec7l
Suggest a correction
Found an error or have a newer source? Corrections to factual errors take priority over new entries.
Related incidents
- containedcritical
Malware in eth-codergen
Malware was discovered in the npm package eth-codergen. Systems with this package installed are considered fully compromised and require immediate remediation.
npmCompromised package - containedcritical
Malware in fs-extra-core
Malware was discovered in the npm package fs-extra-core. Systems with this package installed or running are considered fully compromised and require immediate remediation including secret rotation and package removal.
npmCompromised package - containedcritical
Malware in cktool-core
Malware was discovered in the npm package cktool-core. Systems with the package installed or running are considered fully compromised and require immediate remediation.
npmCompromised package - activecritical
Malware in lychee-norm-cache
Malware discovered in the npm package lychee-norm-cache. Systems with this package installed are considered fully compromised and require immediate remediation.
npmCompromised package