An unspecified vulnerability was found in Microsoft products. By exploiting this vulnerability malicious users can execute arbitrary code. This vulnerability can be exploited remotely via a specially designed HTTP request.

Windows 7 x86, x64 Service Pack 1
Windows Server 2008 R2 x64, Itanium Service Pack 1
Windows 8 x86, x64
Windows 8.1 x86, x64
Windows Server 2012, 2012 R2

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

MS15-034
CVE-2015-1635

3042553

The following public exploits exists for this vulnerability:

https://www.exploit-db.com/exploits/36776

https://www.exploit-db.com/exploits/36773

Malware exists for this vulnerability. Usually such malware is classified as Exploit. More details.