Avira Premium Security Suite
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Macro viruses
Macroviruses are small programs that are written in the macro language of an
application (e.g. WordBasic under WinWord 6.0) and that can normally only spread
within documents of this application. Because of this, they are also called document
viruses. In order to be active, they need that the corresponding applications are activated
and that one of the infected macros has been executed. Unlike "normal" viruses, macro
viruses consequently do not attack executable files but they do attack the documents of
the corresponding host application.
Pharming
Pharming is a manipulation of the host file of web browsers to divert enquiries to
spoofed websites. This is a further development of classic phishing. Pharming fraudsters
operate their own large server farms on which fake websites are stored. Pharming has
established itself as an umbrella term for various types of DNS attacks. In the case of a
manipulation of the host file, a specific manipulation of a system is carried out with the
aid of a Trojan or virus. The result is that the system can now only access fake websites,
even if the correct web address is entered.
Phishing
Phishing means angling for personal details of the Internet user. Phishers generally send
their victims apparently official letters such as emails that are intended to induce them
to reveal confidential information to the culprits in good faith, in particular user names
and passwords or PINs and TANs of online banking accounts. With the stolen access
details, the phishers can assume the identities of the victims and carry out transactions
in their name. What is clear is that: banks and insurance companies never ask for credit
card numbers, PINs, TANs or other access details by email, SMS or telephone.
Polymorph viruses
Polymorph viruses are the real masters of disguise. They change their own programming
codes - and are therefore very hard to detect.
Program viruses
A computer virus is a program that is capable of attaching itself to other programs after
being executed and cause an infection. Viruses multiply themselves unlike logic bombs
and Trojans. In contrast to a worm, a virus always requires a program as host, where the
virus deposits its virulent code. The program execution of the host itself is not changed
as a rule.
Rootkit
A rootkit is a collection of software tools that are installed after a computer system has
been infiltrated to conceal logins of the infiltrator, hide processes and record data -
generally speaking: to make themselves invisible. They attempt to update already
installed spy programs and reinstall deleted spyware.
Script viruses and worms
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