User Guide - Kaspersky Lab

208 Kaspersky Internet Security 7.0
2. Click on Customize under Security Level (cf. Figure 77).
3. Edit file protection parameters in the resulting window and click OK.
15.4.2. Specifying the types of objects to
scan
By specifying the types of objects to scan, you establish which file formats, files
sizes, and drives will be scanned for viruses when this task runs.
The file types scanned are defined in the File types section (see Figure 77).
Select one of the three options:
Scan all files. With this option, all objects will be scanned without exception.
Scan programs and documents (by content). If you select this group of
programs, only potentially infected files will be scanned – files into which a
virus could imbed itself.
Note:
There are files in which viruses cannot insert themselves, since the
contents of such files does not contain anything for the virus to hook onto.
An example would be .txt files.
And vice versa, there are file formats that contain or can contain
executable code. Examples would be the formats .exe, .dll, or .doc. The
risk of insertion and activation of malicious code in such files is fairly high.
Before searching for viruses in an object, its internal header is analyzed
for the file format (txt, doc, exe, etc.).
Scan programs and documents (by extension). In this case, the program
will only scan potentially infected files, and in doing so, the file format will be
determined by the filename’s extension. Using the link, you can review a list
of file extensions that are scanned with this option (see A.1 on pg. 301).
Tip:
Do not forget that someone could send a virus to your computer with the
extension .txt that is actually an executable file renamed as a .txt file. If you
select the Scan Programs and documents (by extension) option, the scan
would skip such a file. If the Scan Programs and documents (by contents) is
selected, the program will analyze file headers, discover that the file is an .exe
file, and thoroughly scan it for viruses.