MAL-2026-6143

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## Source: amazon-inspector (7fb213e524ed75dcb54961d6d2ee9431ea6a32f4fdcb9d777bc260102920d81b) On install, postinstall.js executes automatically and exfiltrates host reconnaissance data to attacker-controlled subdomains on oastify.com (Burp Collaborator), a domain commonly used for out-of-band data exfiltration. The script imports http, https, os, and child_process; calls os.hostname() and execSync() to gather system identifiers; and POSTs the collected data — including hostname, username, and version fields — to hardcoded endpoints such as http://xxxxxxxxx.oastify.com and http://rni4z9qkil62r9dcwosokhtgo7u9i76w.oastify.com. The package name suggests a generic VFS polyfill but the postinstall does no polyfill work; its sole observable effect on `npm install` is system-info exfiltration. This matches the dependency-confusion / reconnaissance beacon pattern.