New Browser-in-the Browser (BITB) Attack Makes Phishing Nearly Undetectable

A novel phishing technique called browser-in-the-browser (BitB) attack can be exploited to simulate a browser window within the browser in order to spoof a legitimate domain, thereby making it possible to stage convincing phishing attacks.

According to penetration tester and security researcher, who goes by the handle mrd0x on Twitter, the method takes advantage of third-party single sign-on (SSO) options embedded on websites such as “Sign in with Google” (or Facebook, Apple, or Microsoft).

While the default behavior when a user attempts to sign in via these methods is to be greeted by a pop-up window to complete the authentication process, the BitB attack aims to replicate this entire process using a mix of HTML and CSS code to create an entirely fabricated browser window.

“Combine the window design with an iframe pointing to the malicious server hosting the phishing page, and it’s basically indistinguishable,” mrd0x said in a technical write-up published last week. “JavaScript can be easily used to make the window appear on a link or button click, on the page loading etc.”

Interestingly, the technique has been abused in the wild at least once before. In February 2020, Zscaler disclosed details of a campaign that leveraged the BitB trick to siphon credentials for video game digital distribution service Steam by means of fake Read more:

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