1) Email worm 
Brontok is a computer virus running on Microsoft Windows. It is able to disperse by e-mail. Variants include: == Other names == Other names for this worm include: W32/Rontokbro.gen@MM, W32.Rontokbro@mm, BackDoor.Generic.1138, W32/Korbo-B, Worm/Brontok.a, Win32.Brontok.A@mm, Worm.Mytob.GH, W32/Brontok.C.worm, Win32/Brontok.E, and W32.Rontokbro.D@mm...