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
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.
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 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.
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
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