WinShell.50

Classification

Trojan

Backdoor

W32

-

Summary

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.

Suspect a file is incorrectly detected (a False Positive)?

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 detection database 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.

For more Support

Knowledge Base

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User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

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