WinShell.50, a variant of WinShell, is a Trojan. WinShell.50 allows an attacker to get full control over the infected system and starts to listen to random port. WinShell.50 listens to remote commands and can be used to get access to an infected system and creates Registry keys to start the file automatically.


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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Technical Details

WinShell.50 creates the following autostart registry entry to enable its automatic execution upon start:

  • [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] StarWind = [Malware path and filename]

Aside from the above-mentioned registry entry, it also registers itself as a service that automatically starts upon boot:

  • [HKLM\SYSTEM\CurrentControlSet\Services\StarWindService] ServiceName = "StarWindService" DisplayName = "StarWind iSCSI Service" StartType = SERVICE_AUTO_START Path = [Malware path and filename]

WinShell.50 opens a random port and waits for the attacker to connect to it. The correct password is required in order for the hacker to have access to the backdoor.

The password is: !QAZ1qaz@

These are the actions that can be remotely executed by the hacker:

  • Download files
  • Exit
  • Reboot the system
  • Remove the malware
  • Shell commands
  • Show the path of the malware
  • Shutdown the system

The malware executes remote commands by using the following programs:

  • cmd.exe
  • command.exe

Date Created: Francis Tan Seng, September 20, 2006

Date Last Modified: Sean Sullivan, November 3, 2006