Alias/es

Detection Availability

Visible Symptoms

• Possible firewall alert that the file "window.exe" is attempting to access the Internet
  
  
• Creation of this file into the System32 folder -

  window.exe - 7,824 bytes
  
  
  

Detailed Analysis

Specifics
Trojan is 32-bit and is a variant of the W32/Mitglieder family. The Mitglieder Trojan and the Bagle virus families share some code and structure. This Trojan functions as an SMTP mail relay on a compromised system.

Loading At Windows Startup
If the Trojan is run, it will copy itself into the System32 folder -

C:\WINNT\System32\WINDOW.exe

The Trojan will register to auto run at next Windows startup as in this example -

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\
"window.exe" = C:\WINNT\System32\window.exe

SMTP Proxy/Remote Access Capability
This Trojan will bind to randomly selected TCP port and await connection from a malicious user. It would be possible to telnet to a compromised system and issue SMTP commands and carry out SMTP delivery via the Trojan's SMTP proxy code.

The Trojan will attempt to notify its presence by connecting to compromised web servers and using a server-side script named "host.php", the Trojan will submit the TCP port in use and the IP address of the compromised system. These are the list of web addresses which are storing the server-side script "host.php" -

http://bohema.amillo.net
http://abc517.net
http://www.abc986.net

Recommended Action

• Check the main screen using the web interface for your FortiGate unit to ensure that the latest AV/NIDS database has been downloaded and installed on your system - if required, enable the "Allow Push Update" option
  
  
• Using the FortiGate manager, enable blocking these web addresses -

  http://bohema.amillo.net
  http://abc517.net
  http://www.abc986.net