EXE files are commonly infected by viruses. After infection, the virus is ran each time the program is ran. The novice user may think that a flag during a heuristic scan indicates a virus. In most cases it is just a false alarm but worth checking out nonetheless. Similar to DDOS only in the nature of the attack.
FDOS programs are singular in form in that there are no other components of the attack structure.
FDOS programs can carry out an attack which is generally designed to disable or shutdown the target of the attack. A virus which attaches itself to, or associates itself with, a file. File infectors usually append or prepend themselves to regular program files or overwrite program code. The file-infector class is also used to refer to programs that do not physically attach to files but associate themselves with program filenames. A method of scanning which looks for patterns or activities that are virus like.