Windows Defender detects and removes this threat.

This threat is a trojan which tries to do one or all of the following:

• Download and install other malware
• Use your computer for click fraud
• Record your keystrokes and the sites you visit
• Send information about your PC, including user names and browsing history, to a remote malicious hacker
• Give a remote malicious hacker access to your PC

Due to the generic nature of this detection, we can only provide general information about it.

Find out ways that malware can get on your PC.  

Exploit:HTML/CVE-2011-1255 is the detection for malicious code that exploits a remote code execution vulnerability in Internet Explorer. The vulnerability is discussed in CVE-2011-1255 and is resolved with the release of Microsoft Security Bulletin MS11-050.