Backdoor.IRC.Bot

Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP


When Backdoor.IRC.Bot is executed, it may create a copy of itself in the %Windir% or the %System% folders.

Note:

* %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
* %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).


In most cases, this Trojan uses one or more of the common loading points to ensure that it runs when you start Windows. For information about common loading points, read one of these documents:

* Common loading points of threats in Windows NT/2000/XP
* Common loading points of threats in Windows 95/98/Me



Some of the actions that Backdoor.IRC.Bot can perform include:

* Listening on an IRC channel for commands from a remote attacker, allowing them to control a compromised computer.
* Connecting through TCP port 6667 or 18067 to an IRC server.
* Viewing system information, such as running processes, software installed, and other items.
* Terminating processes.
* Flooding the IRC channels.
* Flooding mailboxes (mailbombing) .
* Executing programs and scripts on the compromised computer.
* Uploading or downloading the files to the compromised computer.
* Updating the version of the Trojan.
* Participating in a Distributed Denial of Service (DDoS) attack on a remote host.
* Searching files on the compromised computer.
* Executing commands on command.com.
* Scanning for computers with the LSASS vulnerability (described in Microsoft Security Bulletin MS04-011)
* Uninstalling the Trojan.



Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

* Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
* If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
* Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
* Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
* Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
* Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
* Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.

Writeup By: Tony Lee


Source : http://www.symantec.com

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