Winshell

Classification

Malware

Backdoor

W32

Winshell, Backdoor.Winshell

Summary

Backdoor.Winshell is a hacker's tool that allows an attacker to remotely control a computer where it is installed. An attacker just has to telnet to the preconfigured port of the remote computer and a menu is shown.

Removal

Automatic action

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.

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Knowledge Base

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User Guide

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

This backdoor's file is packed with UPX file compressor, the port it listens to is configurable. It allows the following operations to be performed on an infected computer:

1. Install the backdoor so that it will be launched next time Windows starts.

2. Removes the entries created when installing from the Windows registry.

3. Reboot a computer.

4. Open a shell that allows a computer to be controlled remotely.

5. Download any file from a given URL.

When creating a shell, the backdoor executes cmd.exe or command.com command interpreter, depending on Windows version, and pipes its output to the attacker.

All files detected as Backdoor.Winshell should be deleted from an infected system. If some files are locked while Windows is active, they should be deleted from pure DOS (in case of Windows 9x system) or renamed with a different extension (.EXA for example) with further system restart (in case of NT-based system). After restart the renamed file should be deleted.

Date Created: -

Date Last Modified: -