- It monitors Internet access. When the user visits one of several financial or ISP Web sites, the Trojan horse captures sensitive information, such as log-in names, passwords, and other sensitive information. The Trojan horse then sends that information to a Web server for the Trojan horse’s author to retrieve. It installs a proxy server that configures the user’s computer for use as a relay for such actions as sending spam.
- It opens fake dialog boxes that prompt the user to enter confidential information, such as ATM card codes or credit card numbers. This information is then sent to a Web server for the Trojan horse’s author to retrieve.
- February 8, 2005: Microsoft replaced this tool with the Microsoft Windows Malicious Software Removal Tool. For more information about the Malicious Software Removal Tool, click the following article number to view the article in the Microsoft Knowledge Base:890830 The Microsoft Windows Malicious Software Removal Tool helps remove specific, prevalent malicious software from computers that are running Windows Server 2003, Windows XP, or Windows 2000
- July 14, 2004: "Summary," "Resolution," and "Usage Information" sections were updated.
- July 13, 2004: Microsoft released version 1.0 of the Download.Ject Payload Detection and Removal Tool to the Microsoft Download Center. Version 1.0 detects and removes all currently known variants (A to H) of the Backdoor:W32/Berbew Trojan horse.
- Computer performance is decreased or the network connection is slow.
- You receive messages or dialog boxes that request ATM security numbers and credit card information when you visit certain online financial and ISP Web sites.
Important We also recommend that you use an Internet firewall and an antivirus program with up-to-date signatures, and that you keep both Windows and your programs up-to-date.
For more information about how to prevent viruses, and about how to recover from virus infections, click the following article number to view the article in the Microsoft Knowledge Base:
- Your computer must be running Microsoft Windows 2000 SP2 or later or a 32-bit version of Microsoft Windows XP.
- You must log on as a computer administrator or as a member of the Administrators group.
For more information about the Windows update to disable the ADODB.stream object, click the following article number to view the article in the Microsoft Knowledge Base:
Restart requirementYou do not have to restart your computer after you install this tool. Important Before you follow these steps, make sure that you have backed up all your important data.
When you install the Download.Ject Payload Detection and Removal Tool and accept the end-user license agreement (EULA), the installation package extracts the Berbcln.exe file to a temporary folder, and then the removal tool runs. The removal tool verifies that your computer meets the prerequisites that are listed in the "Prerequisites" section. If the prerequisites are met, the removal tool takes the following actions:
- The tool examines the following registry subkeys for entries that the Trojan horse has added:
- The tool searches in memory for evidence of the main Backdoor:Win32/Berbew Trojan horse component. If the removal tool finds this, the process is ended.
- The tool searches for the following data files that the Trojan horse created. These files may contain sensitive personal data. The tool deletes these files. Neh2x32.vxd
- The tool deletes all the files that are associated with the Backdoor:W32/Berbew Trojan horse. These files were identified in steps 1 and 2.
- The tool removes the registry entries that it identified in step 1. If a Berbew registry value no longer points to a file on the hard disk, the removal tool does not remove the orphaned registry value because the registry value will not cause any damage if the associated file does not exist on the hard disk.
- As part of its method of operation, the Trojan horse runs two instances of Microsoft Internet Explorer in hidden windows. These windows try to connect to malicious Web sites. One instance tries to upload stolen personal data, and the other instance looks for software updates for the Trojan horse. If the tool detects the Backdoor:W32/ Berbew Trojan horse on the computer, the tool ends all currently running instances of Internet Explorer.
- The tool displays a message that describes the outcome of the detection and removal process. The following list contains the messages that you may receive, and it explains their meanings.When you close the message box, the removal tool quits, and the Berbcln.exe file is deleted from the temporary folder. You can now delete the Windows-KB873018-ENU-V1.exe file manually.
Message Meaning No infection detected The Backdoor:Win32/Berbew Trojan horse was not detected on this computer. Successfully removed Backdoor:Win32/Berbew.gen Trojan. To prevent malicious communication, all instances of Internet Explorer were terminated. The Backdoor:Win32/Berbew Trojan horse was removed. No additional action is required. This tool must be run by an administrator. You must log out and log on again as an administrator. Fatal error, please review log file. See the %Windir%\Debug\Berbcln.log directory for more information. Backdoor:/W32/Berbew.gen Trojan was detected, but could not be removed. Try to run the tool again and check the log file for errors. This tool requires Windows 2000 or Windows XP. This tool is not supported on versions of Windows other than Windows 2000 and Windows XP. Incorrect Windows version (Win32s) This tool is not supported on Windows 3.1 with Win32s.
- The removal tool creates a log file named Berbcln.log in the %Windir%\Debug folder. You can view this log file to determine if Backdoor:W32/Berbew.gen infections were detected and were removed.
- /Q - Use quiet mode or suppress messages when the files are being extracted.
- /Q:U - Use user-quiet mode. User-quiet mode displays some dialog boxes to the user.
- /Q:A - Use administrator-quiet mode. Administrator-quiet mode does not present any dialog boxes to the user.
path - Specify the location of the temporary folder that is used by the Download.Ject Payload Detection and Removal Tool Setup program, or specify the target folder for extracting files (when this switch is used together with the /C switch).
- /C - Extract the files without installing them. If /T:
path is not specified, you are prompted to specify a target folder.
cmd - Specify the path and the name of another Setup.inf file or an .exe file to use to install the tool.
- /R:N - Never restart the computer after installation.
- /R:I - Prompt the user to restart the computer if a restart is required, except when this switch is used with the /Q:A switch.
- /R:A - Always restart the computer after installation.
- /R:S - Restart the computer after installation without prompting the user
- /S - Enables silent mode for the tool. This switch suppresses the infection status dialog box that you receive after the tool has run.
Note After you install the Download.Ject Payload Detection and Removal Tool, it does not appear in the Installed programs list in the Add/Remove Programs tool in Control Panel.