BITB stands for Browser-In-The-Browser. It is a phishing technique that creates a fake browser window within your web browser using HTML and CSS code. This fake window displays an iFrame of redirection, which is an invisible element that loads content from another URL. The iFrame of redirection mimics the appearance and functionality of a legitimate site, such as Google, Facebook, or Outlook, and asks you to enter your authentication information.
The problem is that this fake window also shows a legitimate URL in the address bar, as well as the icon and the title of the original site. This makes it very difficult to detect the phishing attempt, as most users rely on checking the URL to verify the authenticity of a site. Even if you use a secure connection (https), you are not safe from this attack.
BITB is a very dangerous phishing technique that can compromise your online security and privacy. It can allow hackers to access your accounts, steal your data, or even take over your identity.