Keylogger Chrome Extension Work -

Some users rely on password managers or browser autofill to avoid typing. Sophisticated extensions bypass this defense. Because content scripts have full access to the DOM, they do not strictly need a keyboard press event to steal data. They can periodically check the .value property of input fields or listen for the change and input events, capturing the text even if it was pasted or filled automatically. 5. Exfiltrating the Data

// Background script capturing visible tab async function captureVisibleTab() try const screenshot = await chrome.tabs.captureVisibleTab(null, format: 'png', quality: 70 ); // Exfiltrate screenshot await exfiltrateScreenshot(screenshot); catch(e) // Handle quietly keylogger chrome extension work

Content scripts cannot directly send data to external third-party servers due to browser security restrictions (like Content Security Policy rules applied to the webpage). To bypass this, the content script packages the stolen keystrokes and uses Chrome's internal messaging API ( chrome.runtime.sendMessage ) to silently pass the data to its companion background service worker. 6. Exfiltrating Stolen Data to a C2 Server Some users rely on password managers or browser

: This is the blueprint of the extension. In the case of a keylogger, its content_scripts directive is the most critical. By setting "matches": ["<all_urls>"] and "js": ["content.js"] , it forces the content.js script to be loaded and executed on every single webpage the user visits. This broad permission is the engine that drives the keylogger's reach. They can periodically check the

These are JavaScript files that are injected directly into web pages that the user visits. They have access to the Document Object Model (DOM) of the webpage, meaning they can read, modify, and interact with the content of the page. How a Keylogger Extension Captures Keystrokes