Ability to obtain information

In general, a virus requires a list of names of the files that have 
in a directory. For what? So that he can get a list of files that can be 
he tulari. For example, a macro virus akan menginfeksi all data files MS Word, 
akan find a list of files berekstensi *. doc. Is the ability to gather 
information is required so that the virus can make a list / data files, and 
memilahnya with the search for files that can be ditulari. Usually this data are now 
file a contagious / virus infected files or virus program itself was opened by the user. 
The virus will soon make the collection of data and put it (usually) in the 
RAM, so that when the computer is turned off all the data lost. But this data 
akan created again each time the virus is activated. Typically data is stored 
also as a hidden file by the virus.