W32/Xpaj

W32/Xpaj is a computer virus that uses random code to block anti-virus applications. W32/Xpaj is similar to another virus called W32/Zmist or Mistfall in the way that it uses a polymorphic decryptor to gain control over an infected system. W32/Xpaj has the ability to infect system files such as .dll and .exe extension files spreading to different areas of the computer's hard drive.