W32/Injector.K!tr

Analysis

W32/Injector.K!tr is a generic detection for a type of trojan that drops other malware onto the compromised computer. Since this is a generic detection, files that are detected as W32/Injector.K!tr may have varying behavior.
Below are examples of some of these behavior:

• It drops the following files:
  
  • undefinedAppDataundefined\[Random]\[Random]\1.0.0.0\java update.exe : This file is also detected as W32/Injector.K!tr.
  • undefinedTempundefined\rundll32cyutlhtjyuir.exe : This file is also detected as W32/Injector.K!tr.


• Creates the following autorun registry entries for its dropped files:
  
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Run
    
    • java update = undefinedAppdataundefined\[Random]\[Random]\1.0.0.0\java update.exe
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Run
    
    • rundll32 = undefinedTempundefined\rundll32cyutlhtjyuir.exe


• Network activities are observed to perform DNS queries on the following sites:
  
  • glx[Removed]org

Recommended Action

• Make sure that your FortiGate/FortiClient system is using the latest AV database.
• Quarantine/delete files that are detected and replace infected files with clean backup copies.