Trojan-Spy:W32/Nuklus.A is a modular malware application mainly used for stealing online bank credentials.
It is installed to the system using a browser exploit. According to published reports, the links to sites containing the exploits were spammed.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.
The trojan's main file, iexplore.exe, is downloaded via a browser exploit. When run, iexplore.exe drops the following files:
It creates the following service:
It creates the following registry value:
The trojan injects itself to the web browser and runs the rest of the code in the context of the browser process.
After the installation, it contacts the server in the control file and starts to wait for commands. The remote server may instruct the trojan to execute any of the following actions:
The remote server may instruct the trojan to download additional components using a plugin system. The plugin system consists of DLL files that are loaded by the main trojan or installed to the system using other methods, like browser helper objects (BHO) for Internet Explorer (IE). Plugins communicate with the control server using HTTP requests.
The following DLL files are basic plugins that may be installed to system:
Other plugins can also be installed to infected system.
The remote server reportedly hosts a sophisticated command and control system that the attacker can use to control infected systems via a web interface.
F-Secure Anti-Virus detects this malware with the following updates:
Detection Type: PC
Description Created: 2007-03-27 14:02:36.0
Description Last Modified: 2007-03-27 14:48:17.0