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Aliases :

Breplibot.C, Backdoor.Win32.Breplibot.C, Stinx-F, Ryknos


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:


Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

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:

"$sys$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:

The backdoor joins the following password-protected IRC channel:


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