MS07-063 is not categorized as virus, worm, Trojan or backdoor. It is an important vulnerability in the SMBv2 protocol on Windows Vista computers, which allows arbitrary code to be remotely executed in the vulnerable computer.
Server Message Block (SMB) is the file sharing protocol used by default on Windows computers. SMB Version 2.0 is an update of this protocol on computers with Windows Server 2008 and Windows Vista.
If exploited successfully, MS07-063 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 can be exploited by modifying SMBv2 packets and impersonating a trusted source to perform malicious operations.
If you have Windows Vista installed on your computer, it is recommended to download and apply the security patch for this vulnerability. Click here to access the web page for downloading the patch.