[Last updated & edited on 11/12/2009,Fri]
Most commonly term in technology.
Definitions:
Adware: A application which automatically plays, displays, or downloads advertising material to a user’s computer without users knowing it, or with their partial assistance.
Backdoor: It is a client-server type of application allowing remote access to a computer.
Browser Hijacker: It diverts a user to unwanted web sites by making modification to the user's web browser settings such as a home page, search engine, etc.
Cookie: It tracks a user's surfing history and gathers the user's personal information when a syndicated website is visited.
False positive: Clean file mistakenly labelled as malware. False positives can cause problems, when the file is consider a virus or malware and deletes/quarantined when it is important to the operation of a system, the system may become unstable or even stop working.
Firewall: Designed to block unauthorized access (Such as hackers from gaining control over your computer)
Hoax: This is not a virus, but a trick message warning of a virus that doesn’t actually exist. (Hoaxes are the most common with trustworthy companies ( “Microsoft warns…”, “CNN announced…”, etc.) )
Keylogger: A program that collects and saves a list of all keystrokes made by a user. This program could then publish the list, allowing third parties to access the data (password).
Malware: This term is used to refer to all programs that contain malicious code (MALicious softWARE), contain malicious code, whether it is a virus, Trojan or worm.
Network attack: Operations to disrupt, deny, degrade, or destroy information resident in computers and computer networks, or the computers and networks themselves.
Registry keys: A set of command for your computer to follow/run.
Rootkit: It is a special type of infiltration able to hide its “root” on the infected system without system administrator even seeing it and thus escape detection.
Spyware: It is able to secretly gather information about users or organisations without their knowledge. (Such as password)
Trojan horse: IT is not a virus. They are programs that enter computers appearing to be harmless programs, install themselves and carry out actions that affect user confidentiality.
Viruses: Programs that can enter computers or IT systems in a number of ways, causing effects that range from simply annoying to highly-destructive and irreparable.
Worm: This is similar to a virus, but it differs in that all it does is make copies of itself (or part of itself).
For more definitions, click the below links:
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Virus/malware symptoms:
Computer too slow
Unexplained activity (such as pop-ups, new icons in the desktop etc which you did not download
or install)
Computer keeps crashes, hangs or keeps showing the blue screen
Will not boot (on)
Solutions:
Reformat (works 100 % but it deletes all the files and programs that you installed in your computer and it usually takes around 4-6 hours to completely to reinstall the default programs).
Using an antivirus/antispyware to remove it (Works most of the time)
Click here to view a list of free/trial antivirus/spyware.
For a more thoroughly and easy-to-follow guide in removing virus and malware, click here.
References:
Computer Viruses for Dummies
http://www.thefreedictionary.com/
http://www.singcert.org.sg/awareness/
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