VIRUS PRIMER
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What is Malware?
Malware - short for malicious software, refers to any malicious or unexpected program or code such as viruses, Trojans, and droppers. Not all malicious programs or codes are viruses. Viruses, however, occupy a majority of all known malware to date including worms. The other major types of malware are Trojans, droppers, and kits.
Due to the many facets of malicious code or a malicious program, referring to it as malware helps to avoid confusion. For example, a virus that also has Trojan-like capabilities can be called malware.
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What is a Trojan?
A Trojan is malware that performs unexpected or unauthorized, often malicious, actions. The main difference between a Trojan and a virus is the inability to replicate. Trojans cause damage, unexpected system behavior, and compromise the security of systems, but do not replicate. If it replicates, then it should be classified as a virus.
A Trojan, coined from Greek mythology's Trojan horse, typically comes in good packaging but has some hidden malicious intent within its code. When a Trojan is executed users will likely experience unwanted system problems in operation, and sometimes loss of valuable data.
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What is a Virus?
A computer virus is a program, a piece of executable code, that has the unique ability to replicate. Like biological viruses, computer viruses can spread quickly and are often difficult to eradicate. They can attach themselves to just about any type of file and are spread as files that are copied and sent from individual to individual.
In addition to replication, some computer viruses share another commonality: a damage routine that delivers the virus payload. While payloads may only display messages or images, they can also destroy files, reformat your hard drive, or cause other damage. If the virus does not contain a damage routine, it can cause trouble by consuming storage space and memory, and degrading the overall performance of your computer.
Several years ago most viruses spread primarily via floppy disk, but the Internet has introduced new virus distribution mechanisms. With email now used as an essential business communication tool, viruses are spreading faster than ever. Viruses attached to email messages can infect an entire enterprise in a matter of minutes, costing companies millions of dollars annually in lost productivity and clean-up expenses.
Viruses won't go away anytime soon: More than 60,000 have been identified, and 400 new ones are created every month, according to the International Computer Security Association (ICSA). With numbers like this, it's safe to say that most organizations will regularly encounter virus outbreaks. No one who uses computers is immune to viruses.
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Life Cycle of a Virus
The life cycle of a virus begins when it is created and ends when it is completely eradicated.
The following outline describes each stage:
Creation:
Until recently, creating a virus required knowledge of a computer programming language. Today anyone with basic programming knowledge can create a virus. Typically, individuals who wish to cause widespread, random damage to computers create viruses.
Replication:
Viruses typically replicate for a long period of time before they activate, allowing plenty of time to spread.
Activation:
Viruses with damage routines will activate when certain conditions are met, for example, on a certain date or when the infected user performs a particular action. Viruses without damage routines do not activate, instead causing damage by stealing storage space.
Discovery:
This phase does not always follow activation, but typically does. When a virus is detected and isolated, it is sent to the ICSA in Washington, D.C., to be documented and distributed to antivirus software developers. Discovery normally takes place at least one year before the virus might have become a threat to the computing community.
Assimilation:
At this point, antivirus software developers modify their software so that it can detect the new virus. This can take anywhere from one day to six months, depending on the developer and the virus type.
Eradication:
If enough users install up-to-date virus protection software, any virus can be wiped out. So far no viruses have disappeared completely, but some have long ceased to be a major threat.
What can you do to Protect against Malware?:
There are many things you can do to protect against malware. At the top of the list is using a powerful antivirus product, and keeping it up-to-date with the latest pattern files.
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Most Current Virus Threats
This list provides a synopsis of the most current and latest virus-related threats discovered by
Symantec Security Response, including information on: Category Rating (risk), Name of Threat (threat), the day on which the threat was identified (discovered), and the day on which a virus definition was added to protect against the threat (protection). Please click on the name of the threat for additional information.
If you are currently using a Norton Anti
Virus product you can click
here to get the most current updates for
your virus definitions. These updates are
provided each week and will update your
protection automatically simply by clicking on
'OPEN' when prompted. If you click on 'SAVE' you
will need to install these updates manually.
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