Bomber (also known as Commander Bomber) is a DOS polymorphic memory resident computer virus, known for its technique of "patchy infection". This method of infection is very similar to that which is utilised by the OneHalf computer virus. Contrary to the usual method of infecting executables (which is to append virus body to the executable and to change the entry point), it inserts several fragments ("patches") of its code in random places inside the file. These fragments transfer control to each other using various mechanisms.