Malicious code in chalk-figlet (npm)
The npm package chalk-figlet version 1.2.0 contains malicious code that executes during installation. It runs a postinstall script that downloads a binary named RuntimeBroker.exe from an untrusted HTTP source and executes it on the host system. The package masquerades as a harmless chalk and figlet wrapper but performs unauthorized code execution.
AI Analysis
Technical Summary
The chalk-figlet npm package version 1.2.0 includes a postinstall script triggered during npm install. This script requires index.js, which contains a function _syncTelemetry that decodes a hex-obfuscated URL and filename. It downloads a binary executable from http://104.234.65.75:700/setup.exe, saves it as RuntimeBroker.exe in the system temporary directory, and executes it with hidden windows. This behavior is malicious, as the binary is fetched over unencrypted HTTP from a bare IP address and the filename impersonates a legitimate Windows system process.
Potential Impact
The malicious postinstall script results in arbitrary code execution on the system of any user installing the package version 1.2.0. This can lead to compromise of the host system, persistence, and potential further malicious activity. The use of a fake Windows system binary name increases the risk of evasion and user/system confusion.
Mitigation Recommendations
No official patch or remediation is indicated in the provided data. Users should avoid installing chalk-figlet version 1.2.0. Verify package integrity and source before installation. Consider removing the package if already installed. Monitor for updates or advisories from the package maintainers or npm registry regarding this issue.
Malicious code in chalk-figlet (npm)
Description
The npm package chalk-figlet version 1.2.0 contains malicious code that executes during installation. It runs a postinstall script that downloads a binary named RuntimeBroker.exe from an untrusted HTTP source and executes it on the host system. The package masquerades as a harmless chalk and figlet wrapper but performs unauthorized code execution.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The chalk-figlet npm package version 1.2.0 includes a postinstall script triggered during npm install. This script requires index.js, which contains a function _syncTelemetry that decodes a hex-obfuscated URL and filename. It downloads a binary executable from http://104.234.65.75:700/setup.exe, saves it as RuntimeBroker.exe in the system temporary directory, and executes it with hidden windows. This behavior is malicious, as the binary is fetched over unencrypted HTTP from a bare IP address and the filename impersonates a legitimate Windows system process.
Potential Impact
The malicious postinstall script results in arbitrary code execution on the system of any user installing the package version 1.2.0. This can lead to compromise of the host system, persistence, and potential further malicious activity. The use of a fake Windows system binary name increases the risk of evasion and user/system confusion.
Mitigation Recommendations
No official patch or remediation is indicated in the provided data. Users should avoid installing chalk-figlet version 1.2.0. Verify package integrity and source before installation. Consider removing the package if already installed. Monitor for updates or advisories from the package maintainers or npm registry regarding this issue.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-17223
- Osv Schema Version
- 1.7.4
- Ecosystems
- ["npm"]
Threat ID: 6abb41abf7a7c54106cc3a54
Added to database: 09/29/2026, 04:42:19 UTC
Last enriched: 09/29/2026, 05:00:02 UTC
Last updated: 09/29/2026, 17:59:59 UTC
Views: 15
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