MS10-050 is not categorized as virus, worm, Trojan or backdoor. It is an important vulnerability in different versions of Windows Movie Maker on Windows Vista/XP computers, which allows arbitrary code to be remotely executed in the vulnerable computer.
If exploited successfully, MS10-050 allows hackers to gain remote control of the affected computer with the same privileges as the logged on user. If this user had administrator rights, the hacker could take complete control of the system: create, modify or delete files, install programs, create new user accounts, etc.
This vulnerability is usually exploited by creating a specially crafted Movie Maker project file and enticing users to open it. This malicious file can be sent via email or hosted in a website.
If you have any of the vulnerable Windows Movie Maker versions, it is recommended to download and apply the security patch for this vulnerability. Click here to access the web page for downloading the patch.