MS06-041 is not categorized as virus, worm, Trojan or backdoor. It is a group of critical vulnerabilities on Windows 2003/XP/2000 computers, which allow arbitrary code to be remotely executed in the vulnerable computer.
If exploited successfully, MS06-041 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.
The two vulnerabilities addressed are exploited in different ways. For example, by enticing users into opening a specially crafted file or accessing a malicious website, or by sending a malicious DNS communication to a vulnerable computer.
If you have a Windows 2003/XP/2000 computer, it is recommendable to download and apply the security patch for this vulnerability. Click here to access the web page for downloading the patch.