BAT.Crock

BAT.Crock is another member of a huge family of batch-file infectors. The main aim of the majority of such trojans is searching for BAT-files and infecting them with a copy of infection. This method makes it quite difficult to completely remove the spyware without corrupting different key files, that's why it's strongly recommended not to open any files you don't know in order to protect your PC from getting infected.