Virus:TrojanDownloader:ASX/Wimad.gen!A

Troj/Wimad-E (Sophos)
Trojan.Wimad (Symantec)
Downloader-UA.h (McAfee)

TrojanDownloader:ASX/Wimad is a detection for malicious Windows media files that are used in order to encourage users to download and execute arbitrary files on an affected machine. When opened with Windows Media Player, these malicious files open a particular URL in a web browser.

• Enable a firewall on your computer.
• Get the latest computer updates.
• Use up-to-date antivirus software.
• Use caution with attachments and file transfers.

Enable a firewall on your computer

• Use a third-party firewall product or turn on the Microsoft Windows XP Internet Connection Firewall.
• To turn on the Internet Connection Firewall in Windows XP
• Click Start, and click Control Panel.
• Click Network and Internet Connections. If you do not see Network and Internet Connections, click
• Switch to Category View.
• Click Change Windows Firewall Settings.
• Select On.
• Click OK.

To turn on the Windows Firewall in Windows Vista

• Click Start, and click Control Panel.
• Click Security.
• Click Turn Windows Firewall on or off.
• Select On.
• Click OK.

Get the latest computer updates

Updates help protect your computer from viruses, worms, and other threats as they are discovered. You can use the Automatic Updates feature in Windows XP to automatically download future Microsoft security updates while your computer is on and connected to the Internet.

To turn on Automatic Updates in Windows XP

• Click Start, and click Control Panel.
• Click System.
• Click Automatic Updates.
• Select a setting. Microsoft recommends selecting Automatic. If you do not choose Automatic, but you choose to be notified when updates are ready, a notification balloon appears when new downloads are available to install. Click the notification balloon to review and install the updates.

Use up-to-date antivirus software
Most antivirus software can detect and prevent infection by known malicious software. To help protect you from infection, you should always run antivirus software that is updated with the latest signature files. Antivirus software is available from several sources. For more information, see http://www.microsoft.com/protect/computer/viruses/vista.mspx.

Use caution with attachments and file transfers
Exercise caution with e-mail and attachments received from unknown sources, or received unexpectedly from known sources.  Use extreme caution when accepting file transfers from known or unknown sources.

Via [Microsoft]

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