Surfshark VPN ExtensionSecurity Analysis

Extension intercepts network traffic and sends data externally — potential man-in-the-middle behavior.

Extension has access to all sites and captures keyboard input — behavior consistent with a keylogger.

Dynamically creates script elements, potentially loading external malicious code.

Dynamically sets a script's src attribute to load external code at runtime.

Listens for keyboard events, a common technique used by keyloggers.

Injects and executes scripts in web pages programmatically.

Uses eval() to execute dynamic code, a common technique for obfuscation and code injection.

Object.defineProperty() called on window — can intercept and override built-in browser APIs.

Decodes base64 data, commonly used to hide malicious payloads.

Modifies window.location to redirect the user, potentially to phishing or malicious pages.

Sends messages via Chrome runtime, could communicate with external services.

Makes HTTP requests to external servers, may be used for data exfiltration.

Uses XMLHttpRequest to make network calls.

Dynamically creates iframe elements, which can be used to load external content or hide malicious UI.

JavaScript file could not be parsed and has high entropy. May contain obfuscated code.

Line exceeds 5000 characters (entropy: 5.675165037402635)

Web-accessible resources use <all_urls> or wildcard patterns, exposing resources to every website.

Extension uses tab tracking APIs (onUpdated/query) and communicates with external servers — potential browsing surveillance.

Encodes data to base64, may be used for data exfiltration.

Sets innerHTML directly, which can lead to XSS if used with untrusted data.

Creates a Web Worker, which runs code in a separate thread — can be used for background computation or crypto mining.

String with entropy 5.95 bits — may be encoded/encrypted data

JavaScript file could not be parsed. Likely minified or bundled code.