The following document provides a detailed technical explanation of the Back Orifice tool. There is another existing tool called NetBus which has capabilities similar to Back Orifice. The currently available definitions of Norton AntiVirus detect both Back Orifice and NetBus. To download these definitions, please go here.
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Back Orifice allows a hacker to view and modify any files on the hacked computer. It can create a log file of the computer users actions. It can take screen shots of the computer screen and send them back to the hacker. Or it can simply crash the computer.
It can also transmit screenshots. The Orifice software is functionally very similar to Netbus software of the same kind. There are also many commercial programs for remote control (like Carbon Copy, SMS, PC-Anywhere) and the only substantial difference is that Orifice software tries to conceal its presence when active.
Back Orifice is provided free as an open source program. It can then be delivered to unsuspecting users as a Trojan horse for hacking purposes, or used as a networked remote administration tool. Back Orifice 2000 (BO2K) allows access to Windows XP and Vista. BO2K has the same capabilities as Back Orifice.
Back Orifice Overview Back Orifice is a tool consisting of two main pieces, a client application and a server application. The client application, running on one machine, can be used to monitor and control a second machine running the server application. The operations that the client application can perform on the target machine (e.g., the machine running the server application) include the following:
Execute any application on the target machine.
Log keystrokes from the target machine.
Restart the target machine.
Lockup the target machine.
View the contents of any file on the target machine.
Transfer files to and from the target machine.
Display the screen saver password of the current user of the target machine. The creators of Back Orifice also claim to be able to display 'cached passwords' for the current user, but no other passwords were displayed during our analysis.
ClamWin has an intuitive user interface that is easy to use. To get rid of Back Orifice Plugins, the first step is to install it, scan your computer, and remove the threat. To remove Back Orifice Plugins from your computer using ClamWin, you need to perform the following steps.
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Technical Details
Server application installation In order for Back Orifice to work, the server application must be installed on the target machine. This involves executing the server application on the target machine. The server application is a single executable file with a size just over 122 kilobytes. The application creates a copy of itself in the Windows system directory and adds a value containing its filename to the Windows registry under the key:
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The specific registry value which points to the server application is configurable (see section below on configuration). By doing so, the server application always starts whenever Windows starts, and thus is always active. The application will not appear in the Windows task list.
Target machine requirements The target machine must be running either Windows 95 or Windows 98. Matlab r2010b license. The server application will not run on Windows NT. The target machine must have TCP/IP network capabilities.
Communication The client application communicates with the server application using TCP with encrypted UDP packets.
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Configuration of the server application The server application can be configured with the following parameters:
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Its installed filename
The communication port
The name of the value it will add to the registry
A password for encrypting the client/server packets used for communication
A custom plugin DLL to run with the server application
Default configuration By default, if the server application has not been otherwise configured, the installed filename is '.exe' (e.g., that's a space followed by '.exe'), the communication port is 31337, the registry value name is empty (e.g., the default registry value entry is used), and no password is used (although the communication is still encrypted).
Is Back Orifice a Threat? Potentially, the tool can be used by an unscrupulous user (e.g., the attacker) to compromise the security of a computer running Windows 95 or Windows 98, for example, to steal secret documents, destroy data, etc. However, the following are obstacles limiting the threat:
The server application must be installed on the target machine. This requires the user of the machine to either deliberately install this application or be tricked into doing so.
The attacker must know the IP address of the target machine. Although, the attacker can use the client application to perform a search through a range of IP addresses, this is infeasible if the attacker can not narrow the range to a small subset because there are four billion possible IP addresses.
A firewall between the target machine and the attacker virtually makes it impossible for the attacker to communicate with the target machine. Most corporations have firewalls in place.
By following safe computing practices, for example, not downloading or running applications from unknown sources, users can protect themselves from the potential threat.