W32/Zortob.H!tr

Analysis

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

• Upon execution, it drops the following copy of itself:
  
  • undefinedAppDataundefined\{Random}.exe


• The following registry modification is applied:
  
  • key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • value: {Random}
  • data: undefinedAppDataundefined\{Random}.exe


• During execution, it has been observed to connect to remote sites such as:
  
  • 162.20{Removed} on port 443
  • 218.6{Removed} on port 443
  • 109.10{Removed} on port 443


• Some variants of this malware disguise themselves by using the Microsoft Word Document icon.

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.