Backdoor:Win32/Bifrose.EO

The following system changes may indicate the presence of this malware:

• The presence of the following files:
  <system folder>\plugin1.dat
  %appdata%\addon.dat
• The presence of the following registry subkeys:
  HKLM\SOFTWARE\Bifrost
  HKLM\SOFTWARE\Wget
  HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\MyProduct

• Enable a firewall on your computer.
• Get the latest computer updates for all your installed software.
• Use up-to-date antivirus software.
• Use caution when opening attachments and accepting file transfers.
• Use caution when clicking on links to web pages.
• Avoid downloading pirated software.
• Protect yourself against social engineering attacks.
• Use strong passwords.

Use a third-party firewall product or turn on the Microsoft Windows Internet Connection Firewall.

To turn on the Windows Firewall in Windows Vista

1. Click Start, and click Control Panel.
2. Click Security.
3. Click Turn Windows Firewall on or off.
4. Select On.
5. Click OK.

To turn on the Internet Connection Firewall in Windows XP

1. Click Start, and click Control Panel.
2. Click Network and Internet Connections. If you do not see Network and Internet Connections, click Switch to Category View.
3. Click Change Windows Firewall Settings.
4. Select On.
5. Click OK.

Updates help protect your computer from viruses, worms, and other threats as they are discovered. It is important to install updates for all the software that is installed in your computer. These are usually available from vendor websites.

 

You can use the Automatic Updates feature in Windows to automatically download future Microsoft security updates while your computer is on and connected to the Internet.

To turn on Automatic Updates in Windows Vista

1. Click Start, and click Control Panel. 
2. Click System and Maintainance.
3. Click Windows Updates.
4. Select a setting. Microsoft recommends selecting Install updates automatically and choose a time that is convenient for you. 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.

To turn on Automatic Updates in Windows XP

1. Click Start, and click Control Panel. 
2. Click System.
3. Click Automatic Updates.
4. 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.

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.

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.

Exercise caution with links to web pages that you receive from unknown sources, especially if the links are to a Web page that you are not familiar with, unsure of the destination of, or suspicious of. Malicious software may be installed in your system simply by visiting a Web page with harmful content.

Threats may also be bundled with software and files that are available for download on various torrent sites. Downloading "cracked" or "pirated" software from these sites carries not only the risk of being infected with malware, but is also illegal. For more information, see 'The risks of obtaining and using pirated software'.

While attackers may attempt to exploit vulnerabilities in hardware or software in order to compromise a system, they also attempt to exploit vulnerabilities in human behavior in order to do the same. When an attacker attempts to take advantage of human behavior in order to persuade the affected user to perform an action of the attacker's choice, it is known as 'social engineering'. Essentially, social engineering is an attack against the human interface of the targeted system. For more information, see 'What is social engineering?'.

Attackers may try to gain access to your Windows account by guessing your password. It is therefore important that you use a strong password – one that cannot be easily guessed by an attacker. A strong password is one that has at least 8 characters, and combines letters, numbers, and symbols. For more information, see http://www.microsoft.com/protect/yourself/password/create.mspx.