Answer Description
A Man in the Browser (MitB is a type of man in the middle (MitM) attack using a Trojan Horse to infect the victim's computer. Once installed the trojan will use attempt to use known vulnerabilities in a browser's executable to intercept or modify web traffic. A successful MiTB can occur even with SSL/TLS and without the web application being aware of the attack.
Wikipedia
Man-in-the-browser (MITB, MitB, MIB, MiB), a form of Internet threat related to man-in-the-middle (MITM), is a proxy Trojan horse that infects a web browser by taking advantage of vulnerabilities in browser security to modify web pages, modify transaction content or insert additional transactions, all in a completely covert fashion invisible to both the user and host web application A MitB attack will be successful irrespective of whether security mechanisms such as SSL/PKI and/or two or three-factor Authentication solutions are in place A MitB attack may be countered by using out-of-band transaction verification, although SMS verification can be defeated by man-in-the-mobile (MitMo) malware infection on the mobile phone
Man-in-the-browser - Wikipedia, the free encyclopedia