Backdoor.Win32.Wisdoor.N

Classification

Malware

Backdoor

W32

Backdoor.Win32.Wisdoor.N

Summary

Wisdoor represents a family of backdoors. They allow the remote control of a victim's computer by sending specific commands via IRC channels. Also, these backdoors can steal data and spread to computers vulnerable to exploits.

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.

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.

Find out more

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Submit a sample

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Technical Details

The Windoor.N file is a PE executable about 20 kilobytes long, packed with ASPACK file compressor.

When the Windoor.N file is started, it copies itself as a file named "windll.exe" to the Windows folder and then creates the following startup key value in the Registry:

  • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "windll" = "%WINDIR%\windll.exe"

When the Backdoor is active, it connects to an IRC server, joins a certain channel and acts as a bot there.

The following IRC server and port is used by the Backdoor:

  • web.dardana.info:3926

The backdoor joins the following IRC channel:

  • #at

A hacker can send commands to the bots to and control infected computers. Several tasks can be performed, including the following:

  • Start HTTP server
  • Perform ping, SYN, ICMP and UDP flood
  • Get system information including information about OS, network and drives
  • Download and execute files
  • Log keystrokes
  • Capture video using webcam
  • Send and receive files
  • Scan and exploit computers vulnerable to exploits

When spreading, the bot can exploit the following vulnerabilities:

  • IIS port 80 using 'Web Server Folder Traversal' Vulnerability (MS00-078)
  • MSSQL port 1443, trying to get access using blank SA account password