Trojan (or Trojan horse) is a harmful program that looks legitimate or integrated into legitimate software wait for users to load and execute. Ydky9kv.exe is categorized as malicious trojan that can create a start up registry entry in your system and run automatically when windows reboots. It can disable the firewall, your security software and many executable applications and make threat to your computer. It can change desktop background, display and allow hacker to get unauthorized remote access to the infected computer, corrupt files and break the system, or even leave other malicious malwares or violate user’s privacy. Before Ydky9kv.exe screws up your computer and steal your confidential information, you’d better remove Ydky9kv.exe as soon as possible.