MS06-076 is not categorized as virus, worm, Trojan or backdoor. It is an important vulnerability in Outlook Express 5.5 on Windows 2000 and 6 on Windows 2003/XP/2000 computers, which allows arbitrary code to be remotely executed in the vulnerable computer.
If exploited successfully, MS06-076 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 exploited by creating a malicious web page and enticing users into accessing it or by sending a specially crafted WAB file via email.
If you have any of the vulnerable versions of Outlook Express installed, it is recommended to download and apply the security patch for this vulnerability. Click here to access the web page for downloading the patch. However, provided that this is a cumulative patch, make sure that you download the latest security patch available.