W32/Kryptik.OOU!tr

Analysis

W32/Kryptik.OOU!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/Kryptik.OOU!tr may have varying behavior.
Below are examples of some of these behavior:

• It makes the following network connections:
  
  • Makes a HTTP request with user-agent: "little update" to ita[REMOVED]/fpdf/2804UKm.dat.


• If the response from ita[REMOVED]/fpdf/2804UKm.dat  contains an executable file, it attempts to write it to the current directory and executes it as sedil.exe.
  
• It may use the PDF icon to masquerade as a PDF file.
  
• Attempts to delete the original file from the file path found in the overlay.

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.