Viruses are around us everyday. Not just biological viruses but computer viruses, thousands of computer viruses are being produced every single day.
This info page does not give information about each threat detected by Trojanhelp but rather the definitions of the main virus types. e.g. Worms, Dialers etc. If you have any further questions you could search the specific threat for more information or email me at [email protected].
A Trojan (or Trojan Horse) is a small program, usually
about 25kb in size, which has the main function of giving other
people access to your computer either through the internet of some
other virtual device. These programs can infect your system usually
without your knowledge but unlike worms do not copy or spread to
other systems. Trojans can be harmful to your computer and your
Worms are programs designed to self-replicate from computer
to computer over a network. Worms can cause harm to these networked
systems by using up bandwidth, effectively slowing down or crashing
network usage. Although worms do not cause harm to the file system
or your computer, worms can be created to carry a “payload” with
extra code to harm your computer e.g. carrying a Trojan Horse.
Misleading Application / Rogue Applications
Symantec corporation define misleading applications as
“programs that intentionally misrepresent the security status of a
computer. Misleading applications attempt to convince the user that
they must remove potential malware or security risks (usually
non-existent or fake) from the computer. Misleading applications,
sometimes called Rogue software or Rogue anti-virus, trick consumers
into believing a problem exists on their system”. The TotalSecurity
Program is a Rogue Application carrying a Trojan Horse that asks the
user to pay to fix the threat, creating crashes and warning messages
until you do.
Some software dialers are helpful while malicious software
dialers are just plain bad. Software Dialers are computer programs
designed to create an internet connection through a phone network.
The malicious dialer type connects to a very expensive network,
costing the victim heaps out of pocket.
Adware (Advertising supported software) is sometimes used
by companies to create profit (downloads ads to a computer), or is
used maliciously to steal information (spyware oriented adware).
Adware can sometimes create little pop-up windows that many people
Any program that is able to steal private information and
send it covertly across the internet is classified as spyware.
Usually a victim does not know when the spyware is installed onto
their system as it can sometimes attach itself to websites or
downloadable programs. Spyware can steal your sensitive information
e.g. Banking passwords, email logins etc.
Some software Keyloggers can be bought from online stores
and can be useful to monitor children, staff etc. However, some
types of Keyloggers can be malicious in the sense that they are
similar to spyware and can monitor not just passwords but every
keystroke, e.g. the entire email to a friend, letter by letter. The
difference between software Keyloggers and physical Keyloggers is
that the software type is installed on your computer, while the
physical keylogger is a small device planted between the keyboard
cable and the connection to your computer (highly rare on laptops).