System information

30 Kaspersky Internet Security 2009
Potentially unwanted programs are installed using one of the following methods:
 They are installed by the user, individually or along with another
program (for example, software developers include adware programs
into freeware or shareware programs).
 They are also installed by intruders, for example they include such
programs into packages with other malware programs, use
"vulnerabilities" of the web browser or Trojan downloaders and
droppers, when the user visits an "infected" website.
ADWARE
Subcategory: Adware
Severity level: medium
Adware programs involve display of advertising information to the user. They
display ad banners in other program's interface and redirect search queries to
advertising websites. Some adware programs collect and redirect to their
developer marketing information about the user, for example, which sites he or
she visits or which search requests he or she performs (unlike Trojan spies,
these programs transfer this information with the user's permission).
PORNWARE
Subcategory: Pornware
Severity level: medium
Usually, users install such programs themselves in order to search for or
download pornographic information.
Intruders also can install these programs on the user's computer in order to
display ads of commercial pornographic sites and services to the user without his
or her permission. To be installed, they use vulnerabilities of the operating
system or web browser, Trojan downloaders and Trojan droppers.
There are three types of pornographic nature distinguished based on their
functions. These types are described in the table below.