Hackers backdoor Jscrambler npm package with infostealer malware
A threat actor published a malicious version of the Jscrambler npm package containing infostealer malware. The compromised package was downloaded approximately 1,500 times before discovery and disclosure by Jscrambler.
- Disclosed
- Last updated
- Blast radius
- ~1,500 downloads of the malicious version
- Ecosystems
- Attack vectors
- Affected entities
- Jscramblernpm package backdoored with infostealer malware
Jscrambler, a client-side web security company, disclosed that a threat actor successfully published a malicious version of its npm package. The compromised package contained infostealer malware designed to steal sensitive information from affected systems.\n\nThe malicious version achieved approximately 1,500 downloads before being identified and disclosed. The incident represents a direct compromise of the npm package supply chain, allowing the attacker to distribute malware to developers and applications that depend on the Jscrambler package.\n\nJscrambler's disclosure indicates the threat has been contained, though the exact timeline of when the malicious version was published and when it was removed is not specified in the available information.
Indicators of compromise
- Packages
- Jscrambler
Remediation
- Identify and audit all systems that downloaded the malicious Jscrambler npm package version
- Remove the compromised package version and update to a known-clean version
- Scan affected systems for infostealer malware and indicators of compromise
- Review npm package integrity and implement additional verification mechanisms
- Monitor for any data exfiltration or unauthorized access resulting from the infostealer payload
- Implement npm package pinning and checksum verification in dependency management
Sources
- Hackers backdoor Jscrambler npm package with infostealer malware · BleepingComputer
Cite this entry
"Hackers backdoor Jscrambler npm package with infostealer malware." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 13, 2026; last updated July 13, 2026. https://supplychainattack.org/incident/hackers-backdoor-jscrambler-npm-package-with-infostealer-malware-62cfpn
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