Viruses and more
Avira Professional Security - User Manual (Status: 23 Sep. 2011)
79
reason he is never addressed. If an attacker examines a network for the weak points and
uses the services which are offered by a honeypot, it is logged and an alert is triggered.
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.
