The system itself does not react to HTML/ScrInject.B in any way, because the links are activated within iFrames themselves when the user opens the website that already has the modified HTML pages. Although, if your antivirus program is up to date you might receive alerts from it regarding unsafe websites.
It has also been observed that HTML/ScrInject.B is commonly installed by other malware. So it means that the Trojan's presence indicates other possible malware infections. That would be quite logical considering that HTML/ScrInject.B urges users to click on the infected webpage segments, leading to other infected websites. It doesn't matter whether HTML/ScrInject.B is installed by other malware, or if it fools the user into downloading for malicious applications. The bottom line is that HTML/ScrInject.B brings nothing but trouble and in the end the target computer is swarmed with malicious applications.
Therefore, the user has to remove HTML/ScrInject.B immediately. The most efficient way to get rid of this Trojan is to use a powerful security for malware removal. Not to mention that a reliable program can also delete other infections related to HTML/ScrInject.B.
Quick & tested solution for HTML/ScrInject.B removal.