Threat Description

Breplibot.C

Details

Aliases:Breplibot.C, Backdoor.Win32.Breplibot.C, Stinx-F, Ryknos
Category: Malware
Type:
Platform: W32

Summary



Breplibot.C is a backdoor with bot capabilities. It connects to several IRC servers and waits for commands from the backdoor author. The backdoor tries to utilize Sony DRM software for hiding its process, file and registry keys. More information about Sony DRM can be found here:

http://www.f-secure.com/v-descs/xcp_drm.shtml



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You also may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details



System installation

The backdoor's file is a PE executable about 10 kilobytes long, packed with UPX file compressor.

When the backdoor's file is started, it copies itself as '$sys$xp.exe' file to Windows System folder and then tries to create the following startup key values in the Registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
 [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
 "$sys$cmp" = "$sys$xp.exe"

The string '$sys' is used for hiding the backdoor using Sony's XCP DRM software. This is successful only if the DRM is installed after the backdoor. If the DRM is already installed, the backdoor fails to install itself on system.

The backdoor creates mutex '$sys$xp.exe' for making sure only one copy of the backdoor runs at the same time. It might also create a mutex named 'Super'.

Bot functionality

When the backdoor is active, it connects to an IRC server, joins a certain channel and acts as a bot there.

The following IRC servers and ports are used by the backdoor:

68.101.14.76:8080
 24.210.44.45:8080
 67.171.67.190:8080
 35.10.203.93:8080
 152.7.24.186:8080

The backdoor joins the following password-protected IRC channel:

#cell

A hacker can send commands to the bots to control infected computers. Several tasks can be performed, including the following:

- Download and execute files from remote servers
 - Request system information
 - Delete files



Detection


F-Secure Anti-Virus detects this malware with the following update:
Detection Type: PC
Database: 2005-11-10_04



Description Created: Katrin Tocheva, November 10th, 2005
Description Last Modified: Jarkko Turkulainen, November 11th, 2005


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