IO Trojan

This spyware, which was written in PHP language, doesn't infect those computers, which have no PHP interpreters installed. This pest usually acts by overwriting the AUTOEXEC.BAT with its code and creates several backup copies. What is more, IO Trojan corrupts other PHP scripts and makes them unusable. This is a dangerous technique, that's why it's strongly recommended to have good antiviral software installed on your PC in order to protect it from getting infected with IO Trojan.