Grammarly: AI Writing Assistant and Grammar Checker AppSecurity Analysis

Extension uses chrome.cookies.getAll for bulk cookie access and sends data to external servers — high risk of session token theft.

Extension reads clipboard and communicates externally — potential credential or crypto address theft.

Extension communicates with native apps and executes dynamic code — potential sandbox escape vector.

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

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

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

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

Creates functions from strings, similar to eval(), often used to hide malicious code.

Accesses browser cookies programmatically, could be used to steal session tokens.

Dynamically creates script elements, potentially loading external malicious code.

Injects and executes scripts in web pages programmatically.

Manages other extensions, could disable security tools or install malware.

Reads clipboard contents via the Clipboard API — can access copied passwords, crypto addresses, or sensitive data.

Creates a function from a string (new Function()), similar to eval().

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

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

Uses XMLHttpRequest to make network calls.

Decodes base64 data, commonly used to hide malicious payloads.

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

Opens WebSocket connections, which can be used for persistent command-and-control channels.

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

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

Opens a WebSocket connection, which can be used for persistent C2 channels.

Fetches external URL: https://inkwell.femetrics.grammarly.io/batch/import

Line exceeds 5000 characters (entropy: 5.296862636942769)

JavaScript files are exposed as web-accessible resources. Matched websites can load and interact with extension scripts.

Content script matches <all_urls>, executing on every website the user visits.

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.

Reads or writes to localStorage, which may contain sensitive site data.

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.

object-src is not set to 'none'. Plugins like Flash can be embedded, which may allow code execution.

Extension accepts messages from 1 external pattern(s). Verify these are trusted origins.

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

src/inkwell/assets/SDUIActionHandler-BB7VREq_.js

src/inkwell/assets/SDUIActionHandler-DiU1jAXM.js

src/inkwell/assets/index-Bm4tEXCw.js

src/inkwell/assets/index-CceDU1Ub.js

src/inkwell/assets/index-rqlhpUDb.js

src/inkwell/assets/index-uVYElzgq.js