| This virus directly attacks the program files of the system with the extension as .EXE, .SYS, .COM, .DLL, etc. | This virus attacks the data files of the system. |
| When a relevant task related to a program file is performed, it starts showing its destructive behaviour and the system fails to perform any task directly. | Whenever a user wants to work on any application package related to data files, he finds that either the file is destroyed or it contains some absurd data. Thus, the user is unable to perform any task on those data files. |
| For example- Sunday, Cascade etc. | For example- Bloodhound, Melissa |