Two of the most common ways that malware becomes installed on a computer are bundling and social engineering. With bundling, malware is packaged with useful software. Often the user is not aware of the negative aspects of the bundled software. With social engineering, the user is tricked into installing the software. Typically, the user receives a misleading e-mail or browser pop-up containing instructions to open an attachment or visit a Web site.
Windows Vista and Windows 7 offer significantly improved protection against both bundling and social engineering. With the default settings, malware that attempts to install via bundling or social engineering must circumvent two levels of protection: UAC and Windows Defender.
UAC either prompts the user to confirm the installation of the software (if the user is logged on with an administrative account) or prompts the user for administrative credentials (if the user is logged on with a Standard account). This feature makes users aware that a process is trying to make significant changes and allows them to stop the process. Standard users are required to contact an administrator to continue the installation.
Windows Defender real-time protection blocks applications that are identified as malicious. Windows Defender also detects and stops changes the malware might attempt to make, such as configuring the malware to run automatically upon a reboot. Windows Defender notifies the user that an application has attempted to make a change and gives the user the opportunity to block or proceed with the installation.
With Windows XP and earlier versions of Windows, bundling and social engineering malware installations were likely to succeed because none of these protections was included with the operating system or service packs.
Windows Defender adds events to the System Event Log. Combined with event subscriptions or a tool such as Microsoft Systems Center Operations Manager (SCOM), you can easily aggregate and analyze Windows Defender events for your organization.
Source of Information : Windows 7 Resource Kit 2009 Microsoft Press
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