OpenSSF/OSV advisory MAL-2026-12497 confirms this npm version as malicious. package.json declares a preinstall hook that runs index.js on npm install. index.js collects the installer's hostname, username, home directory, DNS server configuration, package metadata, and the contents of /etc/passwd and /etc/hosts, then POSTs the collected data over HTTPS to the hardcoded host slh4v8u1tz6gjo447tgf9rl3xu3mrcf1.oastify.com (a Burp Collaborator OAST subdomain)...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in vscode-designer-14 (npm)
Details
package.json declares a preinstall hook that runs index.js on npm install. index.js collects the installer's hostname, username, home directory, DNS server configuration, package metadata, and the contents of /etc/passwd and /etc/hosts, then POSTs the collected data over HTTPS to the hardcoded host slh4v8u1tz6gjo447tgf9rl3xu3mrcf1.oastify.com (a Burp Collaborator OAST subdomain). The package has no legitimate functionality that would justify reading local system files or beaconing host identifiers to an out-of-band interaction service; the shape matches a dependency-confusion / typosquat exfiltration beacon.
Decision reason
OpenSSF Malicious Packages via OSV confirms vscode-designer-14@14.0.1 as malicious (MAL-2026-12497): Malicious code in vscode-designer-14 (npm)